The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?
(A) 90
(B) 60
(C) 45
(D) 30
Form Factor is the ratio of__________?
(A) average value/r.m.s. value
(B) average value/peak value
(C) r.m.s. value/average value
(D) r.m.s. value/peak value
For a sine wave with peak value Emax _______ 8.30. the average value is?
(A) 0.636 Emax
(B) 0.707 Emax
(C) 0.434 EWc
(D) lAUEmax
For a sine wave with peak value Imax the r.m.s. value is_______?
(A) 0.5 Imax
(B) 0.707
(C) 0.9
(D) 1.414 Lmax
The time constant of the capacitance circuit is defined as the time during which voltage________?
(A) falls to 36.8% of its final steady value
(B) rises to 38.6% of its final steady value
(C) rises to 63.2% of its final steady value
(D) none of the above
The square waveform of current has following relation between r.m.s. value and average value?
(A) r.m.s. value is equal to average value
(B) r.m.s. value of current is greater than average value
(C) r.m.s. value of current is less than average value
(D) none of the above
In a loss-free R-L-C circuit the transient current is__________?
(A) oscillating
(B) square wave
(C) sinusoidal
(D) non-oscillating
Power factor of the system is kept high__________?
(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
Power factor of the following circuit will be zero__________?
(A) resistance
(B) inductance
(C) capacitance
(D) both
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