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 →
Stator differential protection in alternators cannot detect which type of fault?
AThree-phase symmetrical short circuit
BPhase-to-phase short circuit
CPhase-to-earth fault near neutral
DInter-turn fault in the same phase winding
A 555 Timer IC configured as an Astable Multivibrator operates as a:
ABistable flip-flop
BMonostable pulse stretcher
CLinear voltage regulator
DFree-running square wave oscillator
Equal Area Criterion is a graphical method used in power systems to determine:
ATransient stability limit of a single machine infinite bus system
BOptimal reactive power flow
CEconomic load dispatch strategy
DShort-circuit MVA rating
The primary advantage of High Voltage Direct Current (HVDC) transmission over AC transmission for long distances is:
AEasier voltage stepping without power electronics
BHigher corona loss
CAbsence of reactive power losses and capacitive charging current
DCheaper terminal transformer equipment
The Ferranti Effect in long transmission lines causes the receiving end voltage to be higher than sending end voltage during:
ANo-load or light-load conditions
BOverload conditions
CShort circuit fault conditions
DFull resistive load conditions
Skin depth (depth of penetration) in an electrical conductor decreases when there is an increase in:
AAmbient temperature
BSupply frequency
CConductor length
DInsulation thickness
The speed of a DC Shunt Motor can be controlled above base speed by using:
AArmature resistance control method
BField flux control method (Field weakening)
CArmature voltage control method
DTapped field control
For a BJT to operate in the Active Region for linear amplification, its junctions must be biased as:
ABoth junctions forward biased
BEmitter-Base reverse biased, Collector-Base forward biased
CBoth junctions reverse biased
DEmitter-Base junction forward biased, Collector-Base junction reverse biased
Surge Impedance Loading (SIL) of a transmission line is given by which formula in terms of line voltage V_L and surge impedance Z_c?
AV_L * Z_c
BZ_c / V_L^2
CV_L / Z_c
DV_L^2 / Z_c
A Zener diode is operated in which region when utilized as a constant voltage regulator?
AReverse breakdown region
BReverse saturation region
CCutoff region
DForward conduction region