When a transistor is connected in common emitter mode, it with have__________?

low input resistance as well as output resistance

negligible input resistance and high output resistance

high input resistance and low output resistance

medium input resistance and high output resistance

low input resistance as well as output resistance

Voltage Series feedback also called series-shunt feedback) results in__________?

Decrease in input impedance & increase in output impedance

Increase in both input & output impedances

Decreases in both input & output impedances

Increase in input impedance & decreases in output impedance

Decrease in input impedance & increase in output impedance

To prevent a DC return between source and load, it is necessary to use___________?

resistor between source and load

inductor between source and load

capacitor between source and load

The most commonly used amplifier in sample & hold circuits is______________?

An inverting amplifier with a gain of 10

A unity gain non-inverting amplifier

A unity gain inverting amplifier

An inverting amplifier with a gain of 10

An inverting amplifiers with a gain of 100

The encapsulation of transistor is necessary for__________?

preventing photo-emission effects

avoiding loss of free electrons

The early effect in a bipolar junction transistor is caused by_______________?

large emitter-base forward bias

large collector-base reverse bias

large emitter-base forward bias

The current gain of a bipolar transistor drops at high frequencies because of____________?

High current effects in the base

The bandwidth of an RF tuned amplifier is dependent on____________?

Q –factor of the tuned i/p circuit

Q –factor of the tuned o/p circuit

Q –factor of the tuned i/p circuit

Q-factor of the o/p and i/p circuits as well as quiescent operating point

The action of JFET in its equivalent circuit can best be represented as a_____________?

Current controlled Current source

Current controlled voltage source

Voltage controlled voltage source

voltage controlled current source

Negative feedback in an amplifier____________?

Increase frequency &phase distortion

Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?

input voltage dependent linear transfer characteristic

In an op-amp differentiator:________________?

the amplitude of output is proportional to input

the amplitude of output is proportional to rate of change of input

the amplitude of output is proportional to input

output occurs when input is finite and constant

polarity of input and output is the same

In all base driver amplifiers__________?

ac emitter voltage is 180° out of phase with ac base voltage

ac collector voltage is 180° out of phase with ac base voltage

ac emitter voltage is 180° out of phase with ac base voltage

ac collector voltage is in phase with ac base voltage

In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?

the center of the depletion region on the n-side

the edge of the depletion region on the p-side

the edge of the depletion region on the n-side

the center of the depletion region on the n-side

Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?

Coupling capacitor at the input

Internal Capacitance of the device

Coupling capacitor at the input

Coupling capacitor at the output

Class AB operation is often used in power large signal amplifiers in order to_________?

overcome a crossover distortion

An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz

fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.

fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz

fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

An ideal OP-AMP is an ideal___________?

Voltage controlled voltage source

Current controlled Current source

Current controlled voltage source

Voltage controlled voltage source

voltage controlled current source

A source follower using an FET usually has a voltage gain which is___________?

slightly less than unity but positive

43 + Mcqs in Analog Electronics in Electrical Engineering Questions Page 1 McqOptions

1.	When a transistor is connected in common emitter mode, it with have__________?
A.	negligible input resistance and high output resistance
B.	high input resistance and low output resistance
C.	medium input resistance and high output resistance
D.	low input resistance as well as output resistance
Answer» D. low input resistance as well as output resistance

Discussion

2.	Voltage Series feedback also called series-shunt feedback) results in__________?
A.	Increase in both input & output impedances
B.	Decreases in both input & output impedances
C.	Increase in input impedance & decreases in output impedance
D.	Decrease in input impedance & increase in output impedance
Answer» D. Decrease in input impedance & increase in output impedance

Discussion

3.	To prevent a DC return between source and load, it is necessary to use___________?
A.	resistor between source and load
B.	inductor between source and load
C.	capacitor between source and load
D.	either A. or B.
Answer» D. either A. or B.

Discussion

4.	Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
A.	49dB
B.	51dB
C.	98dB
D.	102dB
Answer» D. 102dB

Discussion

5.	Thermal runaway is not possible in FET because as the temperature of FET increases_________________?
A.	the mobility decreases
B.	the transconductance increases
C.	the drain current increases
D.	none of the above
Answer» B. the transconductance increases

Discussion

6.	The most commonly used amplifier in sample & hold circuits is______________?
A.	A unity gain non-inverting amplifier
B.	A unity gain inverting amplifier
C.	An inverting amplifier with a gain of 10
D.	An inverting amplifiers with a gain of 100
Answer» C. An inverting amplifier with a gain of 10

Discussion

7.	The MOSFET switch in its on-state may be considered equivalent to_____________?
A.	resistor
B.	inductor
C.	capacitor
D.	battery
Answer» D. battery

Discussion

8.	The horizontal intercept of dc load line is the same as ideal____________?
A.	cut off point
B.	saturation point
C.	operating point
D.	quasi saturation point
Answer» B. saturation point

Discussion

9.	The encapsulation of transistor is necessary for__________?
A.	preventing radio interference
B.	preventing photo-emission effects
C.	avoiding loss of free electrons
D.	mechanical ruggedness
Answer» E.

Discussion

10.	The effective channel length of a MOSFET in a saturation decreases with increase in___________?
A.	Gate voltage
B.	Drain voltage
C.	Source voltage
D.	Body voltage
Answer» C. Source voltage

Discussion

11.	The early effect in a bipolar junction transistor is caused by_______________?
A.	fast turn-on
B.	fast turn-off
C.	large collector-base reverse bias
D.	large emitter-base forward bias
Answer» D. large emitter-base forward bias

Discussion

12.	The current gain of a bipolar transistor drops at high frequencies because of____________?
A.	Transistor capacitances
B.	High current effects in the base
C.	Parasitic inductive elements
D.	The early effect
Answer» B. High current effects in the base

Discussion

13.	The current gain of a BJT is__________?
A.	gm r0
B.	gm / r0
C.	gm rπ
D.	gm /rπ
Answer» D. gm /rπ

Discussion

14.	The cascade amplifier is a multistage configuration of__________?
A.	CC-CB
B.	CE-CB
C.	CB-CC
D.	CE-CC
Answer» C. CB-CC

Discussion

15.	The bandwidth of an RF tuned amplifier is dependent on____________?
A.	Q –factor of the tuned o/p circuit
B.	Q –factor of the tuned i/p circuit
C.	Quiescent operating point
D.	Q-factor of the o/p and i/p circuits as well as quiescent operating point
Answer» B. Q –factor of the tuned i/p circuit

Discussion

16.	The action of JFET in its equivalent circuit can best be represented as a_____________?
A.	Current controlled Current source
B.	Current controlled voltage source
C.	Voltage controlled voltage source
D.	voltage controlled current source
Answer» E.

Discussion

17.	Negative feedback in an amplifier____________?
A.	Reduces gain
B.	Increase frequency &phase distortion
C.	Reduces bandwidth
D.	Increases noise
Answer» B. Increase frequency &phase distortion

Discussion

18.	Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
A.	input voltage dependent linear transfer characteristic
B.	high voltage gain
C.	high input resistance
D.	high CMRR
Answer» E.

Discussion

19.	MOSFET can be used as a__________?
A.	current controlled capacitor
B.	voltage controlled capacitor
C.	current controlled inductor
D.	voltage controlled inductors
Answer» C. current controlled inductor

Discussion

20.	Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?
A.	Only the temperature
B.	only the β of the transistor
C.	Both Temperature & β
D.	None of the above
Answer» D. None of the above

Discussion

21.	In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?
A.	23dB
B.	25dB
C.	46dB
D.	50dB
Answer» D. 50dB

Discussion

22.	In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?
A.	all resistors
B.	all transistors
C.	all inductors
D.	all capacitors
Answer» E.

Discussion

23.	In an op-amp differentiator:________________?
A.	the amplitude of output is proportional to rate of change of input
B.	the amplitude of output is proportional to input
C.	output occurs when input is finite and constant
D.	polarity of input and output is the same
Answer» B. the amplitude of output is proportional to input

Discussion

24.	In all base driver amplifiers__________?
A.	ac collector voltage is 180° out of phase with ac base voltage
B.	ac emitter voltage is 180° out of phase with ac base voltage
C.	ac collector voltage is in phase with ac base voltage
D.	none of the above
Answer» B. ac emitter voltage is 180° out of phase with ac base voltage

Discussion

25.	In a transistor leakage current mainly depends on__________?
A.	doping of base
B.	size of emitter
C.	rating of transistor
D.	temperature
Answer» E.

Discussion

26.	In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?
A.	the edge of the depletion region on the p-side
B.	the edge of the depletion region on the n-side
C.	the p-n junction
D.	the center of the depletion region on the n-side
Answer» D. the center of the depletion region on the n-side

Discussion

27.	In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
A.	Vdc = Vm/π, PIV=2Vm
B.	Vdc = 2Vm/π, PIV=2vm
C.	Vdc = 2Vm/π, PIV=Vm
D.	Vdc = Vm/π, PIV=Vm
Answer» C. Vdc = 2Vm/π, PIV=Vm

Discussion

28.	In a common emitter, unbypassed resister provides___________?
A.	voltage shunt feedback
B.	current series feedback
C.	negative voltage feedback
D.	positive current feedback
Answer» D. positive current feedback

Discussion

29.	In a CB amplifier the maximum efficiency could be____________?
A.	99%
B.	85%
C.	50%
D.	25%
Answer» E.

Discussion

30.	If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?
A.	2.3mA
B.	3.2mA
C.	4.6 mA
D.	5.2mA
Answer» E.

Discussion

31.	Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?
A.	Internal Capacitance of the device
B.	Coupling capacitor at the input
C.	Skin effect
D.	Coupling capacitor at the output
Answer» B. Coupling capacitor at the input

Discussion

32.	Class AB operation is often used in power large signal amplifiers in order to_________?
A.	get maximum efficiency
B.	remove even harmonics
C.	overcome a crossover distortion
D.	reducing collector dissipation
Answer» D. reducing collector dissipation

Discussion

33.	An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.
A.	10 volts
B.	5 volts
C.	5/1 volts
D.	5/2 volts
Answer» E.

Discussion

34.	An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?
A.	fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
B.	fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
C.	fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
D.	fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
Answer» C. fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz

Discussion

35.	An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?
A.	0.25
B.	0.5
C.	0.75
D.	1
Answer» C. 0.75

Discussion

36.	An ideal OP-AMP is an ideal___________?
A.	Current controlled Current source
B.	Current controlled voltage source
C.	Voltage controlled voltage source
D.	voltage controlled current source
Answer» C. Voltage controlled voltage source

Discussion

37.	An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
A.	1/11KΩ
B.	1/5KΩ
C.	5KΩ
D.	11KΩ
Answer» B. 1/5KΩ

Discussion

38.	An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?
A.	795mV
B.	395mV
C.	795 mV
D.	39.5mV
Answer» D. 39.5mV

Discussion

39.	A source follower using an FET usually has a voltage gain which is___________?
A.	greater than +100
B.	slightly less than unity but positive
C.	exactly unity but negative
D.	about -10
Answer» B. slightly less than unity but positive

Discussion

40.	A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?
A.	CMMR
B.	Bandwidth
C.	Slew rate
D.	Open-loop gain
Answer» D. Open-loop gain

Discussion

41.	A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?
A.	2
B.	1
C.	1/2
D.	0
Answer» B. 1

Discussion

42.	A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?
A.	5 Ω & 20 %
B.	25 Ω & 20 %
C.	5 Ω & 16.7 %
D.	25 Ω & 16.7 %
Answer» C. 5 Ω & 16.7 %

Discussion

43.	A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?
A.	1 v
B.	2v
C.	1.4v
D.	2.8v
Answer» C. 1.4v

Discussion

Explore topic-wise MCQs in Electrical Engineering Questions.

When a transistor is connected in common emitter mode, it with have__________?

Voltage Series feedback also called series-shunt feedback) results in__________?

To prevent a DC return between source and load, it is necessary to use___________?

Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?

Thermal runaway is not possible in FET because as the temperature of FET increases_________________?

The most commonly used amplifier in sample & hold circuits is______________?

The MOSFET switch in its on-state may be considered equivalent to_____________?

The horizontal intercept of dc load line is the same as ideal____________?

The encapsulation of transistor is necessary for__________?

The effective channel length of a MOSFET in a saturation decreases with increase in___________?

The early effect in a bipolar junction transistor is caused by_______________?

The current gain of a bipolar transistor drops at high frequencies because of____________?

The current gain of a BJT is__________?

The cascade amplifier is a multistage configuration of__________?

The bandwidth of an RF tuned amplifier is dependent on____________?

The action of JFET in its equivalent circuit can best be represented as a_____________?

Negative feedback in an amplifier____________?

Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?

MOSFET can be used as a__________?

Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?

In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?

In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?

In an op-amp differentiator:________________?

In all base driver amplifiers__________?

In a transistor leakage current mainly depends on__________?

In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?

In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?

In a common emitter, unbypassed resister provides___________?

In a CB amplifier the maximum efficiency could be____________?

If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?

Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?

Class AB operation is often used in power large signal amplifiers in order to_________?

An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.

An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?

An ideal OP-AMP is an ideal___________?

An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?

An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?

A source follower using an FET usually has a voltage gain which is___________?

A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?

A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?

A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?

A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?