Power factor of electric bulb is__________?
Power factor of electric bulb is__________?
A. zero
B. lagging
C. leading
D. unity
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In a sine wave the slope is constant_______?
In a sine wave the slope is constant_______?A. between 0° and 90°
B. between 90° and 180°
C. between 180° and 270°
D. no whereThe phosphors for which of the following pair are 180° out of phase for VL, VC and VR______?
The phosphors for which of the following pair are 180° out of phase for VL, VC and VR______?A. Vc and VR
B. VL and VR
C. Vc and VL
D. none of the aboveA sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.
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 nIn a purely inductive circuit__________?
In a purely inductive circuit__________?A. actual power is zero
B. reactive power is zero
C. apparent power is zero
D. none of above is zeroThe input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?
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 kWThe effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?
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