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.Management Sciences
Category: A.C. Fundamentals, Circuits and Circuit Theory
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
The series and parallel resonance on L-C circuit’ differs in that_________?
A. series resistance needs a low-resistance source for sharp rise in current
B. series resonance needs a high-resistance source for sharp increase in current
C. parallel resonance needs a low-resistance source for a sharp in¬crease in impedance
D. parallel resonance needs a low-resistance source for a sharp rise in line current
The product of apparent power and cosine of the phase angle between circuit voltage and current is
A. true power
B. reactive power
C. volt-amperes
D. instantaneous power
In an AC. circuit, a low value of kVAR compared with kW indicates_________?
A. low efficiency
B. high power factor
C. unity power factor
D. maximum load current
Inductance of coil___________?
A. is unaffected by the supply frequency
B. decreases with the increase in supply frequency
C. increases with the increase in supply frequency
D. becomes zero with the increase in supply frequency
The double energy transient occur in the____________?
A. purely inductive circuit
B. R-L circuit
C. R-C circuit
D. R-L-C circuit
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?
A. 12 kW
B. 22 kW
C. 32 kW
D. 64 kW
A parallel AC. circuit in resonance will__________?
A. have a high voltage developed across each inductive and capacitive section
B. have a high impedance
C. act like a resistor of low value
D. have current in each section equal to the line current
Pure inductive circuit takes power from the A.C. line when_________?
A. applied voltage decreases but current increases
B. applied voltage increases but current decreases
C. both applied voltage and current increase
D. both applied voltage and current decrease
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