Which of the following is not necessarily an advantage of interconnecting various power stations?
(A) Improved frequency of power supplied
(B) Reduction in total installed capacity
(C) Increased reliability
(D) Economy in operation of plants
__________ will be least affected due to charge in supply voltage frequency.
(A) Electric clock
(B) Mixer grinder
(C) Ceiling fan
(D) Room heater
In an interconnected system, the diversity factor of the whole system:
(A) remains unchanged
(B) decreases
(C) increases
(D) none of the above
For a consumer the most economical power factor is generally____________?
(A) 0.5 lagging
(B) 0.5 leading
(C) 0.95 lagging
(D) 0.95 leading
Which of the following is the disadvantage of a synchronous condenser?
(A) High maintenance cost
(B) Continuous losses in motor
(C) Noise
(D) All of the above
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that
(A) both waves must have same frequency
(B) both waves must have identical peak values
(C) both waves must have zero value at the same time
(D) none of the above
For the same peak value which of the following wave will ‘have the highest r.m.s. value?
(A) square wave
(B) half wave rectified sine wave
(C) triangular wave
(D) sine wave
The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?
(A) 180″
(B) 90°
(C) 60°
(D) 0°
The peak value of a sine wave is 200 V. Its average value is___________?
(A) 127.4 V
(B) 141.4 V
(C) 282.8 V
(D) 200V
The period of a sine wave is _____ seconds. Its frequency is
(A) 20 Hz
(B) 30 Hz
(C) 40 Hz
(D) 50 Hz