Engineering
Engineering MCQs With Answers
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Pitch factor (or chord factor) K_p of an alternator coil short-pitched by angle alpha is equal to:
Asin(alpha / 2)
Bcos(alpha / 2)
Ctan(alpha / 2)
Dcos(alpha)
A two-port linear network is classified as reciprocal if its Z-parameters satisfy which condition?
AZ11 = Z22
BZ11 * Z22 = Z12 * Z21
CZ12 = -Z21
DZ12 = Z21
A two-port linear network is defined as symmetrical if its ABCD transmission parameters satisfy:
AAD - BC = 1
BA = D
CB = C
DA = B
In a Boost converter (step-up DC-DC chopper), the average output voltage V_o is given by:
AV_o = D * V_s
BV_o = D * V_s / (1 - D)
CV_o = V_s / (1 - D)
DV_o = (1 - D) * V_s
What is the primary role of a freewheeling diode connected across an inductive load in a converter circuit?
AIncreases supply current
BReverses direction of load current
CDissipates stored magnetic energy and prevents inductive voltage spikes
DReduces output DC voltage
In a Buck converter (step-down DC-DC chopper), the average output voltage V_o in terms of input voltage V_s and duty cycle D is:
AV_o = D * V_s
BV_o = V_s / (1 - D)
CV_o = V_s / D
DV_o = D * V_s / (1 - D)
A TRIAC can be simplified as being equivalent to:
ATwo SCRs connected in anti-parallel with a common gate
BAn SCR and a diode in series
CTwo BJTs connected back-to-back
DTwo diodes in series
A Semiconductor Controlled Rectifier (SCR) is a solid-state device containing how many PN junctions?
A4 PN junctions
B3 PN junctions
C1 PN junction
D2 PN junctions
A Mho relay (admittance relay) is inherently directional and is best suited for protecting:
ADistribution transformers
BShort transmission lines
CLong transmission lines
DMedium length transmission lines
Which distance relay is least affected by arc resistance and is preferred for short transmission lines?
AReactance relay
BImpedance relay
CMho relay
DThermal relay