AC Fundamentals, Circuits, and Circuit Theory MCQs with answers for Electrical Engineering test preparation. Includes Three-Phase System MCQs, AC Fundamentals, Circuits, and Circuit Theory MCQs PDF, and Circuit Theory Quiz.
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is ___ ?
A. 60 sin 50 t
B. 42.42 sin 314 t
C. 60 sin 25 t
D. 84.84 sin 314 tIn any A.C. circuit always ____ ?
A. Actual power is more than reactive power
B. Reactive power is more than actual power
C. Reactive power is more than apparent power
D. Apparent power is more than actual powerThe double energy transient occur in the ____ ?
A. R-L circuit
B. R-L-C circuit
C. Purely inductive circuit
D. R-C circuitWhich of the following waves has the highest value of peak factor ?
A. Sine wave
B. Triangular wave
C. Square wave
D. Half wave rectified sine waveA parallel AC circuit in resonance will ____ ?
A. Act like a resistor of low value
B. have current in each section equal to the line current
C. have high impedance
D. have a high voltage developed across each inductive and capacitive sectionPower factor of the following circuit will be zero:
A. Capacitance
B. Resistance
C. Inductance
D. Both a and cThe safest value of current the human body can carry for more than 3 second is:
A. 9 mA
B. 25 mA
C. 4 mA
D. 15 mAPure inductive circuit ____ ?
A. Takes power from the line during some part of the cycle and then return back it during other part of the cycle
B. Does not take power at all from a line
C. Consumes some power on average
D. None of themThe purpose of a parallel circuit resonance is to magnify:
A. power
B. frequency
C. current
D. voltageCapacitive reactance is more when:
A. Capacitance is more and frequency of supply is less
B. Capacitance is more and frequency of supply is more
C. Capacitance is less and frequency of supply is more
D. Capacitance is less and frequency of supply is less