Category: A.C. Fundamentals, Circuits and Circuit Theory

A. electronic equipment
B. transformers
C. current transformers
D. auto transformers

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

A. 20 Hz
B. 30 Hz
C. 40 Hz
D. 50 Hz

A. increasing core length
B. decreasing the number of turns
C. decreasing the diameter of the former
D. choosing core material having high relative permeability

A. to reduce line losses
B. to maximise the utilization of the capacities of generators, lines and transformers
C. to reduce voltage regulation of the line
D. due to all above reasons

A. R/C
B. RC2
C. RC
D. R2C

A. the current through the resistance is more
B. the current through the resistance is less
C. both resistance and inductance carry equal currents
D. none of the above

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

A. reactive power in a circuit
B. the extent of neutralisation of reactive power in a circuit
C. a purely capacitive circuit’s ability to pass current
D. a purely capacitive circuit’s ability to resist the flow of current

A. 0.636 Emax
B. 0.707 Emax
C. 0.434 EWc
D. lAUEmax