Engineering
Engineering MCQs With Answers
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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)
The function of a expansion tank (Conservator) in a power transformer is to:
AFilter out moisture from ambient air
BPrevent overvoltage transients
CTake up expansion and contraction of transformer oil during temperature changes
DCool the winding insulation directly
An enhancement-mode MOSFET conducts drain current only when gate-to-source voltage V_GS is:
ANegative for N-channel
BEqual to zero
CLess than breakdown voltage
DGreater than threshold voltage V_th
Which type of DC generator has the best voltage regulation under varying load conditions?
ADC Shunt generator
BFlat compounded DC generator
CDC Series generator
DOver compounded DC generator
The step angle of a 4-phase stepper motor having 200 rotor teeth is:
A1.8 degrees
B0.45 degrees
C7.5 degrees
D15 degrees
A Slip-Ring (Wound Rotor) Induction Motor is preferred over a Squirrel Cage motor when the application requires:
AMaximum speed exceeding synchronous speed
BMaintenance-free operation
CZero speed regulation
DHigh starting torque with low starting current