A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________? A. the big size of the inductor B. the reactance of the inductor C. the current flowing in the inductorD. the…
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
The ratio of active power to apparent power is known as factor__________? A. demand B. loadC. power D. form
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 kVARB. 6 kVAR C. 8 kVAR D. 16 kVAR
A parallel AC. circuit in resonance will__________? A. have a high voltage developed across each inductive and capacitive sectionB. have a high impedance C. act like a resistor of low value D. have current in each section equal to the…
In AC. circuits, laminated iron is invariably used in order to__________? A. reduce eddy current loss B. increase heat radiation C. make assembly cheap and easier D. reduce circuit permeability
All definitions of power factor of a series R-L-C circuit are correct except__________? A. ratio of net reactance and impedance B. ratio of kW and kVA C. ratio of J and Z D. ratio of W and VA
The purpose of a parallel circuit resonance is to magnify________? A. currentB. voltage C. power D. frequency
Wire-wound resistors are unsuitable for use at high frequencies because they_______? A. create more electrical noise B. are likely to melt under excessive eddy current heat C. consume more powerD. exhibit unwanted inductive and capacitive effects
Which of the following statements pertains to resistors only _____________? A. can dissipate considerable amount of power B. can act as energy storage devices C. connecting them in parallel in¬creases the total value D. oppose sudden changes in voltage