Basic Electrical Engineering (3110005) MCQs

MCQs of AC Circuits

Showing 11 to 20 out of 117 Questions
1 2 3 4 5 6
11.

The rms value is ______ times the maximum value.

(a)

1.414
(b)

0.5
(c)

2
(d)

0.707
Answer:

Option (d)

12.

Usually phasor diagrams are drawn representing?

(a)

RMS value
(b)

Peak value
(c)

Average value
(d)

Instantaneous value
Answer:

Option (a)

13.

The resultant of two alternating sinusoidal voltages or currents can be found using

(a)

Triangular law
(b)

Parallelogram law
(c)

Either triangular or parallelogram law
(d)

Neither triangular nor parallelogram law
Answer:

Option (b)

14.

The power for a purely resistive circuit is zero, when?

(a)

Current is zero
(b)

Voltage is zero
(c)

Both current and voltage are zero
(d)

Either current or voltage is zero
Answer:

Option (d)

15.

Inductor does not allow sudden changes in?

(a)

Voltage
(b)

Current
(c)

Resistance
(d)

Inductance
Answer:

Option (b)

16.

Inductance is ________ to number of turns in the coil.

(a)

Directly proportional
(b)

Inversely proportional
(c)

Equal
(d)

Not related
Answer:

Option (a)

17.

In an inductive circuit, the current ______ the voltage?

(a)

Leads
(b)

Lags
(c)

Is greater than
(d)

Is less than
Answer:

Option (b)

18.

For an RL circuit, the phase angle is always

(a)

Positive
(b)

Negative
(c)

0
(d)

90
Answer:

Option (b)

19.

What is the resonance condition?

(a)

When XL > XC
(b)

When XL
(c)

When XL = XC
(d)

When XC = infinity
Answer:

Option (c)

20.

What is the relation between reactance, resistance and impedance?

(a)

Z = R + jX
(b)

Z = R + X
(c)

Z = R - X
(d)

Z = R - jX
Answer:

Option (a)

Showing 11 to 20 out of 117 Questions
1 2 3 4 5 6