Engineering
Engineering MCQs With Answers
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In DC generators, armature reaction causes the Main Field Flux to undergo:
AComplete elimination of harmonics
BOnly zero-sequence suppression
CCross-magnetizing and demagnetizing effects
DOnly magnetizing effects
The armature winding of a DC machine designed for high current and low voltage applications is typically:
AWave winding
BConcentric winding
CLap winding
DBasket winding
The synchronous speed N_s of an 8-pole 3-phase alternator connected to a 50 Hz AC supply is:
A1000 RPM
B750 RPM
C1500 RPM
D3000 RPM
In a transformer, the open-circuit test is conducted on which side while keeping the other side open?
ALow-Voltage (LV) side
BTertiary winding side
CHigh-Voltage (HV) side
DBoth LV and HV sides simultaneously
The direction of rotation of a 3-phase induction motor can be reversed by:
ADecreasing supply voltage magnitude
BIncreasing supply voltage frequency
CInterchanging any two phase supply leads
DReversing all three supply leads
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