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. Load
C. 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 kvar
B. 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 section
B. Have a high impedance
C. Act like a resistor of low value
D. Have current in each section equal to the line current

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. Current
B. Voltage
C. Power
D. Frequency

Wire-wound resistors are unsuitable for use at high frequencies because they_______?

A. Create more electrical nosie
B. Are likely to melt under excessive eddy current heat
C. Consume more power
D. 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

Aphasoris________?

A. A line which represents the magnitude and phase of an alternating quantity
B. A line representing the magnitude and direction of an alternating quantity
C. A coloured tag or band for distinction between different phases of a 3-phase supply
D. An instrument used for measuring phases of an unbalanced 3-phase load