Engineering
Engineering MCQs With Answers
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The characteristic impedance (Surge Impedance Z_c) of an overhead transmission line is typically around:
A1000 Ohms
B400 Ohms
C4 Ohms
D40 Ohms
Which DC motor exhibits the highest starting torque and should never be started without a mechanical load?
ADC Shunt Motor
BDC Series Motor
CDifferential Compound DC Motor
DFlat Compounded DC Motor
The internal fault protection of large power transformers is primary provided by:
ABuchholz Relay
BUnder-frequency Relay
CThermal Overload Relay
DDistance Relay
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
A Synchronous Condenser is an over-excited synchronous motor operating under which load condition?
A50% mechanical load
BFull resistive load
COverload condition
DNo load
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%