Electrical Engineering Mcqs Practice Test

Question 1

A certain circuit is composed of two parallel resistors. The total resistance is 1,403 Ω. One of the resistors is 2 kΩ. The other resistor value is____________?

Accepted Answer

B. 4.7 kΩ

Question 2

A certain Wheatstone bridge has the following resistor values: R1 = 10 kΩ, R2 = 720 Ω, and R4 = 2.4 kΩ. The unknown resistance is_____________?

Accepted Answer

D. 3,000 Ω

Question 3

A 12 kΩ resistor, a 15 kΩ resistor, and a 22 kΩ resistor are in series with two 10 kΩ resistors that are in parallel. The source voltage is 75 V. Current through the 15 kΩ resistor is approximately___________?

Accepted Answer

B. 1.4 mA

Question 4

A voltage divider consists of two 68 kΩ resistors and a 24 V source. The unknown output voltage is______________?

Accepted Answer

A. 12 V

Question 5

A gain of 1000 times in voltage is expressed by_______________?

Accepted Answer

A.	60 db

Question 6

The upper or lower cut off frequency is also called______________frequency?

Accepted Answer

C.	3 db

Question 7

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 ?

Accepted Answer

C.	68 W

Question 8

The number of stages that can be directly coupled is limited because___________?

Accepted Answer

A.	Changes in temperature cause thermal instability

Question 9

The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?

Accepted Answer

A.	More than

Question 10

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?

Accepted Answer

D.	5 mV

Question 11

If the power level of an amplifier reduces to half, the db gain will fall by___________?

Accepted Answer

D.	3 db

Question 12

In the initial stages of a multistage amplifier, we use______________?

Accepted Answer

A.	RC coupling

Question 13

A gain of 1,000,000 times in power is expressed by_____________?

Accepted Answer

B.	60 db

Question 14

In transistor amplifiers, we use_____________transformer for impedance matching?

Accepted Answer

B.	Step down

Question 15

If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?

Accepted Answer

D.	27 db

Question 16

Transformer coupling is generally employed when load resistance is______________?

Accepted Answer

C.	Small

Question 17

_____________coupling provides the maximum voltage gain?

Accepted Answer

B.	Transformer

Question 18

In RC coupling, the value of coupling capacitor is about_______________?

Accepted Answer

D. 10 µF

Question 19

The best frequency response is of_____________coupling?

Accepted Answer

C.	Direct

Question 20

In obtaining the frequency response curve of an amplifier, the______________?

Accepted Answer

D.	Generator output level is held constant