Basic electrical Mcqs

 01. A sine wave has a frequency of 50 Hz. Its angular frequency is _______radian/second.

100 π

50 π

25 π

5 π


02. The form factor is the ratio of

Peak value to r.m.s. value

r.m.s. value to average value

Average value to r.m.s. value

None of the above


03. A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to

Average voltage

R.M.S voltage

Peak voltage

None of the above


04. The voltage of domestic supply is 230V. This figure represents

1 point

Mean value

R.M.S value

Peak value

Average value


05. Two waves of the same frequency have opposite phase when the phase angle between them is

360°

180°

90°

06. The r.m.s. value and the Average value is the same in the case of

Triangular wave

Sine wave

Square wave

Half-wave rectified sine wave


07. Form factor for a sine wave is

1.414

0.707

1.11

0.637


08. For a frequency of 200 Hz, the time period will be

0.5 s

0.005 s

0.00005 s

5 s


09. In a series resonant circuit, the impedance of the circuit is

Minimum

Maximum

Zero

None of the above


10. Which of the following circuit component opposes the change in the circuit voltage?

Inductance

Capacitance

Conductance

Resistance


11. The best place to install a capacitor is

Very near to inductive load

Across the terminals of the inductive load

Far away from the inductive load

Any where


12. Capacitors for power factor correction are rated in

kW

kVA

kV

kVAR


13. All the rules and laws of D.C. circuit also apply to A.C. circuit containing

Capacitance only

Inductance only

Resistance only

All above


14. Power factor of the following circuit will be unity

inductance

Capacitance

Resistance

Both 1 and 2


15. Power factor of the following circuit will be zero

Resistance

Inductance

Capacitance

Both 2 and 3

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