Question Bank
GE2151 (2UGME-A) Basic Electrical and Electronics Engineering
GE2151 (2UGME-A) Basic Electrical and Electronics Engineering
Unit-1
1.
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State
Ohms law and its limitations. .
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2.
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Compare
series and parallel circuits
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2
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3.
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Define
electric current 2
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4.
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Define
electric potential
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2
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5.
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Define
Peak factor and Form factor.
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6.
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Define
RMS value of an alternating waveform.
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7.
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Derive
the equation for equivalent resistance of resistors connected in parallel.
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8.
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Distinguish
between Power and Energy.
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9.
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List
various forces required for the operation of any measuring instrument .
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10.
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State
and explain Kirchoff's laws
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11.
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State
Krichoffs laws
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12.
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State
Ohms law
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13.
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What do
you mean by resistance in an electric circuit?
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14.
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What is
resistivity or specific resistance?
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15.
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Whatis
electric energy?
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16.
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Write
the expression for finding current through individual resistors when the
total current and resistance values of two resistor connected in parallel are
known.
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17.
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Find
the current in 4ohm resistor.
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18.
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The
element of 500W electric iron is designed for use on a 200V supply. What
value of resistance is needed to be connected in series in order that iron
can be operated from 240V supply?
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19.
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Two
coils connected in series have a resistance of 18ohm and when connected in
parallel of 4ohm. Find the value of resistance of the two coils.
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20.
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Two
resistors 4ohm and 6ohm are connected in parallel. If the total current is
12A, find the current through each resistor. SHAPE \* MERGEFORMAT
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23.
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A
filament lamp is rated for 100W, 110V. Find the value of the resistance to be
connected in series with this lamp so that it can be operated on a 230V
supply. What is the power loss in the resistor?
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8
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25.
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The
power supplied to the load R and the voltage across it in figure are 500W and
100V. Determine (i) the value of the Vs, (ii) the power dissipated in each
resistor. Also confirm that the power delivered by the source equals the
total power dissipated elsewhere.
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8
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27.
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A 318mF
capacitor is connected across a 230V, 50Hz system. Determine i) the
capacitive reactance ii) RMS value of current iii) equations for voltage and
current. (AU/ECE – June 2005)
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10
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28.
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A 50H
sinusoidal current wave has a peak amplitude of 10A. Find the rate of change
of current in amperes per sec at time t (a) 0.0025 (b) 0.005 and (c) 0.01 sec
after I = 0 and is increasing.
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10
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29.
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A pure
inductance of 318 mH is connected in series with a pure resistance of 75Ă.
The circuit is supplied from a 50Hz source and the voltage across the 75Ă
resistor is found to be 150V. Calculate the supply voltage and the phase
angle. (AU/ECE - May 2005)
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10
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31.
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Find
the average value, RMS value and form factor of a periodic wave having the
following values for equal time intervals suddenly form one value to the
next. 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10, etc. (AU/CSE – Dec
2006)
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10
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32.
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Find
the supply voltage E such that the power in the 20Ă resistor is 180W.(AU/CSE
June ¡V 2006)
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10
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34.
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Three
100 Ohm resistors are connected first in star and then in delta across 415V,
3-phase supply. Calculate the line and phase currents in each case and also
the power taken from the source.
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35.
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7. A
circuit is composed of a resistance 6Ă and a series capacitive reactance of
8Ă. A of voltage e(t)=141 sin 314T is supplied to the circuit. Find (i)
Complex impedance (ii) Effective value of current (iii) Power delivered to
the circuit (iv) Capacitance of the capacitor. (AU/Mech - May 2003)
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36.
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A
series R-L-C circuit is connected to a 230V, 50Hz, 1-phase AC supply. The
value of R = 5 Ohm, L =13mH, and C = microF. Find total reactance, impedance,
current drawn by the circuit and p.f. pf the circuit. (AU/Mech – Dec 2006)
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37.
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A
sinusoidal voltage of frequency 50Hz has a maximum value of 240V. What is its
equation? Find the value of the voltage at (a) time t -= 0.0025sec after the
voltage passes through zero and is increasing and at (b) time t = 0.001 sec
after the voltage passes through zero and is decreasing.
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40.
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A coil
of resistance 10Ă and inductance 0.1H is connected in series with a 150
microF capacitor across 200V, 50Hz supply. Calculate
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Unit-2
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1.
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Classify
single phase induction motor according to the method of starting and briefly
explain them.
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2
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2.
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Define
"transformation ratio" of a single phase transformers.
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2
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3.
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Define
step up and step down transformer.
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2
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4.
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Draw
the circuit diagram of any one type of single phase induction motor.
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2
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5.
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Is
single phase induction motor self-starting. Why?
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2
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6.
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List
out the applications of DC compound motor.
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2
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7.
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List
out the applications of DC series motor.
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2
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8.
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List
out the applications of DC shunt motor.
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2
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9.
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List
out the different types of DC motor.
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2
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10.
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List
out the important parts of a DC motor.
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2
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11.
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Mention
the application of a DC series generator.
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2
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12.
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Mention
the application of DC shunt generator.
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2
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13.
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Mention
the two different types of armature winding in a DC machine.
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2
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14.
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State
the purposes of magnetic yoke in a DC machine.
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2
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15.
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What
are the basic parts of a DC generator?
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2
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16.
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What
are the classification of single phase induction motor based on the method of
starting?
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2
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17.
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What
are the different types of generators?
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2
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18.
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What
are the different types of single phase induction motor?
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2
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19.
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What
are the different types of transformers?
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2
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20.
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What
are the kinds of self excited DC generator?
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2
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21.
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What
are the two types of compound generator?
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2
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22.
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What is
a back emf in DC motor?
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2
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23.
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What is
a transformer?
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2
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24.
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What is
the function of commutator in DC machine?
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2
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25.
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Why is
a shunt motor called constant speed drive?
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2
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26.
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Why is
the armature core made of laminations?
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2
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27.
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Why is
the core of transformer laminated?
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2
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28.
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Write
down the equation for generated EMF in a DC generator.
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2
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29.
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Write
down the torque equation of DC motor.
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2
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30.
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Brief
about the excitation of DC generator.
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4
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31.
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Draw
the circuit diagram of DC series motor and write the relationships among the
currents and voltages.
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4
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32.
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Draw
the circuit diagram of DC shunt motor and write the relationships among the
currents and voltages.
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4
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33.
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Draw
the circuit diagram of separately excited motor and write the relationships
among the currents and voltages.
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4
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34.
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Draw
the circuit model of a DC generator and write the relationships among the
currents and voltages.
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4
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35.
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Draw
the circuit model of a DC series generator and write the relationships among
the currents and voltages.
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4
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36.
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Draw
the circuit model of compound generators and write relationships among the
currents and voltages.
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4
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37.
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Discuss
the function and constructional details of the following parts of a DC
machine (i) Commutator (ii) Brush assembly and (iii) Interpoles.
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6
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38.
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Explain
the various types of DC motors with suitable diagrams showing the connections
of field coils to armature.
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6
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39.
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Derive
the equation for induced emf of a DC machine.
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8
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40.
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Derive
the torque equation of DC motor.
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8
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41.
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Describe
the construction details of transformer and also explain the principle of
operation.
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8
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42.
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Explain
the principle of operation of a single phase transformer and derive the EMF
equation of a transformer.
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8
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43.
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Explain
the principle of operation of a transformer.
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8
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44.
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Explain
the principle of operation of single phase 2-winding transformer.
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8
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45.
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Explain
the principle of operation of single phase induction motor and describe
various starting methods of the same.
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10
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46.
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Explain
the principle of operation of single phase induction motor.
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10
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47.
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Discuss
in detail about the construction of DC generator with the neat sketch.
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12
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48.
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Explain
the principle of operation of a DC motor.
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12
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49.
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Explain
the principles of operation of DC generator.
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12
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50.
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Draw
and explain the construction of a DC generator and also derive the emf
equation of a DC generator.
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16
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51.
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Explain
the construction and working principle of a DC motor.
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16
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52.
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Explain
the principle of operation of a DC generator and derive the emf equation.
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16
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Unit-3
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1.
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Define
rectification efficiency
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2
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2.
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Define
ripple factor.
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2
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3.
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What
are the two types of semiconductor?
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2
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4.
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What do
you mean by intrinsic and extrinsic semiconductor?
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2
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5.
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What do
you mean by N-type semiconductor?
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2
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6.
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What do
you mean by P-type semiconductor?
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2
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7.
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What do
you mean by PN junction?
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2
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8.
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What is
a rectifier?
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2
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9.
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What is
meant by NPN transistor?
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2
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10.
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What is
meant by PNP transistor?
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2
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11.
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Explain
in detail the working of PNP transistor.
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6
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12.
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Explain
how a PN junction is formed?
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8
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13.
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Explain
in detail the working of NPN transistor.
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8
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14.
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How
does early effect affect the BJT characteristics in CBconfiguration?
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8
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15.
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Draw
and explain input and output characteristics of CB configuration.
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10
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16.
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Draw
the circuit of transistor in common emitter configuration of BJT and sketch
the output characteristics indicates the active, saturation and cutoff
region. Derive the relationship between á and â for BJT.
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10
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17.
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Explain
with diagram the VI characteristics of PN junction diode under forward and
reverse biased condition.
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12
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18.
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Explain
with neat sketch the input and output characteristics of common emitter
configuration of transistor.
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12
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19.
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Draw
the circuit diagram of a full wave bridge rectifier network supplying a
resistive load. Explain the operation of the network with relevant waveforms.
Also obtain the rectification efficiency.
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16
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20.
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Explain
briefly the Zener diode voltage regulator.
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16
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21.
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Explain
the working of Zener diode along with its characteristics
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16
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22.
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Explain
with neat diagram the working of half wave and full wave rectifier
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16
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23.
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Explain
with neat sketch the input and output characteristics of common base
configuration of transistor.
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16
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24.
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Explain
with neat sketch the input and output characteristics of common collector
configuration of transistor.
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16
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Unit-4
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1.
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Convert
the following binary number into decimal number. (i)1001001 (ii)0.0101
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2
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2.
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Convert
the following decimal number into binary number.(i)139 (ii)100.625
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2
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3.
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State
De Morgan's theorem.
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2
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4.
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What
are logic gates?
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2
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5.
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What
are universal gates?why are they called so?
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2
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6.
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What do
you mean by a counter? What are the types of counters?
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2
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7.
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What do
you mean by a shift register?
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2
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8.
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What do
you mean by Asynchronous counter?
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2
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9.
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What do
you mean by synchronous counter?
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2
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10.
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What is
a flip-flop?
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2
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11.
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Explain
in detail about D flip-flop with circuit diagram and truth table.
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6
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12.
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Explain
in detail about T flip-flop with circuit diagram and truth table.
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6
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13.
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Explain
the operation of half adder with circuit diagram?
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6
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14.
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Explain
in detail about clocked RS flip-flop with circuit diagram and truth table.
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8
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15.
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Explain
in detail about JK flip-flop with circuit diagram and truth table.
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8
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16.
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Explain
in detail about RS flip-flop with circuit diagram and truth table.
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8
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17.
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Explain
the operation of Asynchronous counter.
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8
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18.
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Explain
the operation of decade counter with timimg diagram.
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8
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19.
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Explain
the operation of parallel-in parallel-out shift register.
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8
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20.
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Explain
the operation of parallel-in serial-out shift register.
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8
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21.
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Explain
the operation of serial-in parallel-out shift register.
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8
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22.
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Explain
the operation of Synchronous counter with timimg diagram.
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8
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23.
|
Explain
with timing diagram the operation of serial in serial out shift register.
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8
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24.
|
Explain
the operation of full adder with circuit diagram?
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10
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25.
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Explain
anyone type of the followinf. (i)A/D converter (ii)D/A converter
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16
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26.
|
Explain
the operation of basic gates using its electrical equivalent circuit and
truth table.
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16
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|
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Unit-5
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1.
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Compare
AM and FM?
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2
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2.
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compareanalog
and digital signal.
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2
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3.
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Define
communication.
|
2
|
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4.
|
Draw
the block diagram of communication system.
|
2
|
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5.
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Draw
the block diagram of microwave communication.
|
2
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6.
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What
are the advantages of optical communication?
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2
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7.
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What
are the types of communication?
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2
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8.
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What
are the types of Modulation?
|
2
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9.
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What do
you mean by amplitude modulation?
|
2
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10.
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what do
you mean by message signal and carrier signal?
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2
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11.
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What is
FAX?
|
2
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12.
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What is
meant by demodulation?
|
2
|
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13.
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What is
meant by modulation?
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2
|
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14.
|
Explain
in detail about amplitude modulation?
|
8
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15.
|
Explain
with a neat block diagram the operation of microwave communication system ?8
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16.
|
Explain
the operation of AM radio transmitter with a neat block diagram?
|
12
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17.
|
Explain
the operation of FM radio transmitter with a neat block diagram?
|
12
|
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18.
|
Explain
with a neat block diagram the operation of Optical Fibre communication system
?
|
12
|
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19.
|
Explain
in detail about frequency modulation?
|
14
|
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20.
|
Explain
the operation of Fax with a neat block diagram?
|
16
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21.
|
Explain
the operation of monochrome TV receiver with a neat block diagram?
| |
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22.
|
Explain
the operation of monochrome TV transmitter with a neat block diagram?
|
16
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23.
|
Explain
with a neat block diagram the operation of satellite communication system ?
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16
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