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

A. directly as the cross-sectional area of magnetic core
B. directly as square of number of turns
C. directly as the permeability of the core
D. inversely as the length of the iron path
E. as A. to (d)

A. current is maximum
B. current is minimum
C. impedance is maximum
D. voltage across C is minimum

A. square wave
B. half wave rectified sine wave
C. triangular wave
D. sine wave

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