The frequency of domestic power supply in Pakistan is_________?

Related Mcqs:

1. The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?

   A. 4 kVAR
   B. 6 kVAR
   C. 8 kVAR
   D. 16 kVAR

2. A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.

   A. 100 n
   B. 50 jt
   C. 25 JT
   D. 5 n

3. The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_______ohms?

   A. 2.5
   B. 5
   C. 10
   D. 15

4. The voltage of domestic supply is 220V. This figure represents__________?

   A. mean value
   B. r.m.s. value
   C. peak value
   D. average value

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

   A. 360°
   B. 180°
   C. 90°
   D. 0°

6. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?

   A. be reduced by half
   B. be doubled
   C. be four times at high
   D. be reduced to one fourth

7. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?

   A. be reduced by half
   B. be doubled
   C. be four times as high
   D. be reduced to one fourth

8. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?

   A. iron loss in core
   B. skin effect
   C. increase in temperature
   D. capacitive effect between adjacent coil turns

9. The ratio of active power to apparent power is known as factor__________?

   A. demand
   B. load
   C. power
   D. form

10. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?

    A. 12 kW
    B. 22 kW
    C. 32 kW
    D. 64 kW