In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
(A) be reduced by half
(B) be doubled
(C) be four times at high
(D) be reduced to one fourth
An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?
(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
In an A.C. circuit power is dissipated in____________?
(A) resistance only
(B) inductance only
(C) capacitance only
(D) none of the above
Skin effect occurs when a conductor carries current at_______ frequencies
(A) very low
(B) low
(C) medium
(D) high
The power is measured in terms of decibles in case of_________?
(A) electronic equipment
(B) transformers
(C) current transformers
(D) auto transformers
At _______ frequencies the parallel R-L circuit behaves as purely resistive
(A) low
(B) very low
(C) high
(D) very high
At very low frequencies a series R-C circuit behaves as almost purely___________?
(A) resistive
(B) inductive
(C) capacitive
(D) none of the above
The frequency of domestic power supply in Pakistan is_________?
(A) 200 Hz
(B) 100 Hz
(C) 60 Hz
(D) 50 Hz
In a three-phase supply floating neutral is undesirable because it way give rise to___________?
(A) high voltage across the load
(B) low voltage across the load
(C) unequal line voltages across the load
(D) minimun voltage across the load
The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?
(A) 282.8 V
(B) 141.4 V
(C) 111 V
(D) 100 V