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Category: A.C. Fundamentals, Circuits and Circuit Theory
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?
A. 42.42 sin 3141
B. 60 sin 25 t
C. 30 sin 50 t
D. 84.84 sin 25 t
For the same peak value, which of the following wave has the least mean value ?
A. half wave rectified sine wave
B. triangular wave
C. sine wave
D. square wave
All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?
A. capacitance only
B. inductance only
C. resistance only
D. all above
The form factor is the ratio of_______?
A. peak value to r.m.s. value
B. r.m.s. value to average value
C. average value to r.m.s. value
D. none of the above
Inductance affects the direct current flow__________?
A. only at the time of turning off
B. only at the time of turning on
C. at the time of turning on and off
D. at all the time of operation
Power factor of the following circuit will be zero__________?
A. resistance
B. inductance
C. capacitance
D. both B. and C.
Pure inductive circuit____________?
A. consumes some power on average
B. does not take power at all from a line
C. takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
D. none of the above
The purpose of a parallel circuit resonance is to magnify________?
A. current
B. voltage
C. power
D. frequency
In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of__________?
A. R only
B. L only
C. C only
D. LorC
E. R,LorC
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