Electrical Engineering Mcqs Practice Test

Question 1

Pure inductive circuit____________?

Accepted Answer

C. takes power from the line during some part of the cycle and then returns back to it during other part of the cycle

Question 2

Inductance of a coil Varies__________?

Accepted Answer

E. as A. to (d)

Question 3

In a highly capacitive circuit the__________?

Accepted Answer

C. reactive power is more than the actual power

Question 4

In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?

Accepted Answer

D. will increase the selectivity of the circuit

Question 5

Poor power factor________?

Accepted Answer

E. results in all above

Question 6

Time constant of an inductive circuit___________?

Accepted Answer

A. increases with increase of inductance and decrease of resistance

Question 7

Capacitive reactance is more when_______?

Accepted Answer

A. capacitance is less and frequency of supply is less

Question 8

For a frequency of 200 Hz, the time period will be__________?

Accepted Answer

B. 0.005 s

Question 9

Capacitors for power factor correction are rated in_________?

Accepted Answer

D. kVAR

Question 10

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?

Accepted Answer

C. 45

Question 11

Form Factor is the ratio of__________?

Accepted Answer

C. r.m.s. value/average value

Question 12

For a sine wave with peak value Emax _______ 8.30. the average value is?

Accepted Answer

A. 0.636 Emax

Question 13

For a sine wave with peak value Imax the r.m.s. value is_______?

Accepted Answer

B. 0.707

Question 14

Form factor for a sine wave is________?

Accepted Answer

C. 1.11

Question 15

The r.m.s. value and mean value is the same in the case of___________?

Accepted Answer

C. square wave

Question 16

For the same peak value, which of the following wave has the least mean value  ?

Accepted Answer

A. half wave rectified sine wave

Question 17

The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?

Accepted Answer

B. 90°

Question 18

Two waves of the same frequency have opposite phase when the phase angle between them is_________?

Accepted Answer

B. 180°

Question 19

If two sine waves of the same frequency have a phase difference of JT radians, then_______?

Accepted Answer

C. when one wave reaches its maxi¬mum value, the other will reach its minimum value

Question 20

A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?

Accepted Answer

B. r.m.s. voltage