Engineering
Engineering MCQs With Answers
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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
A power electronic converter that converts DC power directly into AC power at desired voltage and frequency is called an:
AInverter
BRectifier
CCycloconverter
DChopper
A Cycloconverter is a power electronic circuit used to convert:
ADC power into high frequency AC
BAC power at one frequency directly into AC power at another frequency
CFixed DC into variable DC
DAC power into DC power
In a two-wattmeter method for 3-phase power measurement, one wattmeter reads zero when the load power factor angle is:
A60 degrees (cos phi = 0.5)
B0 degrees (cos phi = 1.0)
C90 degrees (cos phi = 0.0)
D30 degrees (cos phi = 0.866)
The Latching Current of an SCR is always:
AGreater than its Holding Current
BLess than its Holding Current
CEqual to its Holding Current
DZero
The total active power P in a balanced 3-phase system expressed in terms of line voltage V_L and line current I_L is:
A3 * V_L * I_L * cos(phi)
Bsqrt(3) * V_L * I_L * cos(phi)
Csqrt(3) * V_L * I_L * sin(phi)
DV_L * I_L * cos(phi)