Electrical Engineering
Electrical Engineering MCQs with Answers
Electrical engineering MCQs with answers and detailed explanations for PEC, NTS, WAPDA and engineering job tests. Machines, circuits and power systems. Take a scored quiz instead →
Maximum power transfer from source to load occurs when the load resistance equals the internal resistance of the source, resulting in an efficiency of:
A78.5%
B100%
C86.6%
D50%
The core of a high-frequency transformer is typically made of ferrite materials to reduce:
ACopper losses in windings
BMechanical friction
CEddy current and hysteresis losses
DStray magnetic flux leakage
In an R-L-C parallel resonant circuit, the total circuit admittance at resonance is:
AMinimum (Purely conductive)
BMaximum
CZero
DInfinite
The voltage across an inductor is directly proportional to the:
ASquare of current
BRate of change of current (di/dt)
CMagnitude of steady DC current
DIntegral of current over time
The Crest Factor (Peak Factor) of a standard sinusoidal voltage waveform is equal to:
A1.11
B0.707
C0.637
Dsqrt(2) ≈ 1.414
The power factor of an R-C series AC circuit is:
AZero lagging
BUnity
CLeading
DLagging
According to Compensation Theorem, any linear bilateral passive resistance R in a network carrying current I can be replaced by a voltage source of value:
AV / R
BI^2 * R
CI * R
DI / R
In a 3-phase star-connected balance system, the line voltage V_L leads its corresponding phase voltage V_ph by an angle of:
A60 degrees
B90 degrees
C30 degrees
D0 degrees
The reciprocal of complex impedance in an AC circuit is called:
ASusceptance
BReactance
CConductance
DAdmittance
In an AC system, Reactive Power Q measured in VAR is represented by:
AV * I * tan(phi)
BV * I * cos(phi)
CV * I
DV * I * sin(phi)