Top 350+ Solved Electromagnetics MCQ Questions Answer
Q. is that property of a capacitor which delays any change of voltage across it.
a. inductance
b. capacitance
c. potential gradient
d. none of the above
Q. A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The timeconstant of the circuit is
a. 0.2 s
b. 0.4 s
c. 0.6 s
d. 0.8 s
Q. In a cable capacitor, voltage gradient ismaximum at the surface of the
a. earth
b. conduction
c. sheath
d. insulator
Q. The time constant of an R-C circuit is defined as the time during which capacitorcharging voltage actually rises to percent of its value.
a. 37, initial
b. 63.2, initial
c. 63.2, final
d. 37, final
Q. A capacitor consists of two
a. ceramic plates and one mica disc
b. insulators separated by a dielectric
c. silver-coated insulators
d. conductors separated by an insulator
Q. What will happen to an insulating medium if voltage more than the breakdownvoltage is applied on it ?
a. it will become magnetic
b. it will melt
c. it will get punctured or cracked
d. its molecular structure will get changed
Q. The capacitance C is charged through a resistance R. The time constant of the chargingcircuit is given by
a. cir
b. 1/rc
c. rc
d. ric
Q. The bridge used for the measurement of the value of the capacitance is
a. wien\s bridge
b. wheatstone bridge
c. schering bridge
d. hay\s bridge
Q. If an ohmmeter reading immediately goes practically to zero and stays there, capacitoris
a. charged
b. short-circuited
c. lossy
d. satisfactory
Q. Out of the following capacitors of identical rating which one will have the smallestdimensions ?
a. aluminium foil capacitor
b. mica capacitor
c. ceramic capacitor
d. paper capacitor
Q. Mica capacitors are characterised by all of thte following except
a. stable operation
b. accurate value
c. low leakage reactance
d. low losses