Electrical Engineering Mcqs Practice Test

Question 1

In Colpitt’s oscillator, feedback is obtained___________?

Accepted Answer

C. From the centre of split capacitors

Question 2

Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance_____________?

Accepted Answer

D. is less than 600 Ω

Question 3

The following resistors are in parallel across a voltage source: 220Ω , 470Ω , and 560Ω . The resistor with the least current is______________?

Accepted Answer

C. 560 Ω

Question 4

In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?

Accepted Answer

A. R3 is open

Question 5

For an oscillator to properly start, the gain around the feedback loop must initially be_________?

Accepted Answer

B. Greater than 1

Question 6

Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is______________?

Accepted Answer

A. 25 Ω

Question 7

One condition for oscillation is_____________?

Accepted Answer

C. A phase shift around the feedback loop of 0o

Question 8

The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω that makes up part of the parallel circuit is approximately_______________?

Accepted Answer

A. 22 mA

Question 9

The crystal oscillator frequency is very stable due to___________of the crystal?

Accepted Answer

D. High Q

Question 10

In a phase shift oscillator, the frequency determining elements are _______________?

Accepted Answer

C. R and C

Question 11

Hartley oscillator is commonly used in______________?

Accepted Answer

A. Radio receivers

Question 12

A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximately________________?

Accepted Answer

C. 60 Ω

Question 13

Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is______________?

Accepted Answer

C. 20 KΩ

Question 14

In an LC oscillator, the frequency of oscillator is____________L or C?

Accepted Answer

D. Inversely proportional to square root of

Question 15

When a 1.6 kΩ resistor and a 120Ω resistor are connected in parallel, the total resistance is____________?

Accepted Answer

C. less than 120 but greater than 100 Ω

Question 16

An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately___________?

Accepted Answer

B. 5.5 Ω

Question 17

Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?

Accepted Answer

D. 72 W

Question 18

An oscillator converts __________?

Accepted Answer

B. power into a.c. power

Question 19

A sudden increase in the total current into a parallel circuit may indicate______________?

Accepted Answer

C. an increase in source voltage

Question 20

Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately_______________?

Accepted Answer

D. 7.06 A