Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 40 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

RC coupling is not used to amplify extremely low frequencies because____________?
A. There is considerable power loss
B. There is hum in the output
C. Electrical size of coupling capacitor becomes very large
D. None of the above
Answer» D. None of the above
Discussion
2.

In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
A. Changes abruptly with frequency
B. Is constant
C. Changes uniformly with frequency
D. None of the above
Answer» C. Changes uniformly with frequency
Discussion
3.

The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?
A. More than
B. The same as
C. Less than
D. Data insufficient
Answer» B. The same as
Discussion
4.

The upper or lower cut off frequency is also called______________frequency?
A. Resonant
B. Sideband
C. 3 db
D. None of the above
Answer» D. None of the above
Discussion
5.

A gain of 1000 times in voltage is expressed by_______________?
A. 60 db
B. 30 db
C. 120 db
D. 600 db
Answer» B. 30 db
Discussion
6.

The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?
A. 2 W
B. 6 W
C. 68 W
D. None of the above
Answer» D. None of the above
Discussion
7.

The number of stages that can be directly coupled is limited because___________?
A. Changes in temperature cause thermal instability
B. Circuit becomes heavy and costly
C. It becomes difficult to bias the circuit
D. None of the above
Answer» B. Circuit becomes heavy and costly
Discussion
8.

The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?
A. 5 mV
B. 2 mV
C. 8 mV
D. 5 mV
Answer» E.
Discussion
9.

If the power level of an amplifier reduces to half, the db gain will fall by___________?
A. 5 db
B. 2 db
C. 10 db
D. 3 db
Answer» E.
Discussion
10.

A gain of 1,000,000 times in power is expressed by_____________?
A. 30 db
B. 60 db
C. 120 db
D. 600 db
Answer» C. 120 db
Discussion
11.

In the initial stages of a multistage amplifier, we use______________?
A. RC coupling
B. Transformer coupling
C. Direct coupling
D. None of the above
Answer» B. Transformer coupling
Discussion
12.

In transistor amplifiers, we use_____________transformer for impedance matching?
A. Step up
B. Step down
C. Same turn ratio
D. None of the above
Answer» C. Same turn ratio
Discussion
13.

If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?
A. 600 db
B. 24 db
C. 14 db
D. 27 db
Answer» E.
Discussion
14.

The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?
A. Power loss in the coupling device
B. Loading effect of the next stage
C. The use of many transistors
D. The use of many capacitors
Answer» C. The use of many transistors
Discussion
15.

The value of emitter capacitor CE in a multistage amplifier is about____________?
A. 1 µF
B. 100 pF
C. 0.01 µF
D. 50 µF
Answer» E.
Discussion
16.

1 db corresponds to_____________change in voltage or current level?
A. 40%
B. 80%
C. 20%
D. 25%
Answer» B. 80%
Discussion
17.

A current amplification of 2000 is a gain of_________________?
A. 3 db
B. 66 db
C. 20 db
D. 200 db
Answer» C. 20 db
Discussion
18.

1 db corresponds to_____________change in power level?
A. 50%
B. 35%
C. 26%
D. 22%
Answer» D. 22%
Discussion
19.

RC coupling is generally confined to low power applications because of____________?
A. Large value of coupling capacitor
B. Low efficiency
C. Large number of components
D. None of the above
Answer» C. Large number of components
Discussion
20.

The purpose of RC or transformer coupling is to_____________?
A. Block a.c.
B. Separate bias of one stage from another
C. Increase thermal stability
D. None of the above
Answer» C. Increase thermal stability
Discussion
21.

An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?
A. 8 db
B. 6 db
C. 5 db
D. 4 db
Answer» B. 6 db
Discussion
22.

The gain of an amplifier is expressed in db because_____________?
A. It is a simple unit
B. Calculations become easy
C. Human ear response is logarithmic
D. None of the above
Answer» D. None of the above
Discussion
23.

Transformer coupling is generally employed when load resistance is______________?
A. Large
B. Very large
C. Small
D. None of the above
Answer» D. None of the above
Discussion
24.

In RC coupling, the value of coupling capacitor is about_______________?
A. 100 pF
B. 0.1 µF
C. 0.01 µF
D. 10 µF
Answer» E.
Discussion
25.

When a multistage amplifier is to amplify d.c. signal, then one must use_____________coupling?
A. RC
B. Transformer
C. Direct
D. None of the above
Answer» D. None of the above
Discussion
26.

The frequency response of transformer coupling is___________?
A. Good
B. Very good
C. Excellent
D. Poor
Answer» E.
Discussion
27.

_____________coupling provides the maximum voltage gain?
A. RC
B. Transformer
C. Direct
D. Impedance
Answer» C. Direct
Discussion
28.

The best frequency response is of_____________coupling?
A. RC
B. Transformer
C. Direct
D. None of the above
Answer» D. None of the above
Discussion
29.

Transformer coupling provides high efficiency because___________?
A. Collector voltage is stepped up
B. resistance is low
C. collector voltage is stepped down
D. none of the above
Answer» C. collector voltage is stepped down
Discussion
30.

In obtaining the frequency response curve of an amplifier, the______________?
A. Amplifier level output is kept constant
B. Amplifier frequency is held constant
C. Generator frequency is held constant
D. Generator output level is held constant
Answer» E.
Discussion
31.

The lower and upper cut off frequencies are also called_____________frequencies?
A. Sideband
B. Resonant
C. Half-resonant
D. Half-power
Answer» E.
Discussion
32.

In an RC coupling scheme, the coupling capacitor CC must be large enough______________?
A. To pass d.c. between the stages
B. Not to attenuate the low frequencies
C. To dissipate high power
D. None of the above
Answer» C. To dissipate high power
Discussion
33.

The ear is not sensitive to___________?
A. Frequency distortion
B. Amplitude distortion
C. Frequency as well as amplitude distortion
D. None of the above
Answer» B. Amplitude distortion
Discussion
34.

A radio receiver has____________of amplification?
A. One stage
B. Two stages
C. Three stages
D. More than one stages
Answer» E.
Discussion
35.

The noise factor of an ideal amplifier expressed in db is_____________?
A. 0
B. 1
C. 10
D. 100
Answer» B. 1
Discussion
36.

An advantage of RC coupling scheme is the___________?
A. Good impedance matching
B. Economy
C. High efficiency
D. None of the above
Answer» C. High efficiency
Discussion
37.

Transformer coupling is used for__________amplification?
A. Power
B. Voltage
C. Current
D. None of the above
Answer» B. Voltage
Discussion
38.

In practice, voltage gain is expressed______________?
A. In db
B. In volts
C. As a number
D. None of the above
Answer» B. In volts
Discussion
39.

RC coupling is used for_____________amplification?
A. Voltage
B. Current
C. Power
D. None of the above
Answer» B. Current
Discussion
40.

The final stage of a multistage amplifier uses______________?
A. RC coupling
B. Transformer coupling
C. Direct coupling
D. Impedance coupling
Answer» C. Direct coupling
Discussion