Electrical Engineering MCQs

Page No. 183

Conductance is analogous to_____________?


apermeance

✓


breluctance

✖


c flux

✖


dinductance

✖


View Answer permeance

Hard steel is suitable for making permanent magnets because_____________?


a it has good residual magnetism

✓


b its hysteresis loop has large area

✖


cits mechanical strength is high

✖


dits mechanical strength is low

✖



Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity


alow, high

✖


b high, high

✓


chigh, low

✖


d low, low

✖


View Answer . high, high

Conductivity is analogous to____________?


aretentivity

✖


bresistivity

✖


cpermeability

✓


dinductance

✖


View Answer permeability

When both the inductance and resistance of a coil are doubled the value of________________?


a time constant remains unchanged

✓


b initial rate of rise of current is doubled

✖


c final steady current is doubled

✖


dtime constant is halved

✖



Energy stored by a coil is doubled when its current is increased by percent___________?


a 25

✖


b 50

✖


c41.4

✓


d100

✖


View Answer 41.4

Relative permeability of vacuum is__________?


a 1

✓


b1 H/m

✖


c1/4JI

✖


d4n x 10-‘ H/m

✖


View Answer 1

Permeability in a magnetic circuit corresponds to________ in an electric circuit


aresistance

✖


bresistivity

✖


c conductivity

✓


d conductance

✖


View Answer conductivity

The relative permeability of a ferromagnetic material is_____________?


aless than one

✖


bmore than one

✖


cmore than 10

✖


d more than 100 or 1000

✓



A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?


aPaper capacitor

✖


bCeramic capacitor

✖


cElectrolytic capacitor

✓


dAny-of the above

✖



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