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 →
String Efficiency of a insulator string in an overhead line can be improved by:
AUsing a guard ring and longer cross-arms
BRemoving ground wires
CIncreasing the number of insulator discs endlessly
DUsing smaller conductors
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