91. Electric displacement is a______quantity.
A. scalar
B. vector
C. both of the above
D. none of the above
B. vector
92. The unit of dielectric strength is given by
A. V/m
B. V2/m
C. m/V
D. m/V2
A. V/m
93. Dielectric strength ______ with increasing thickness
A. increases
B. decreases
C. remains unaltered
D. none of the above
B. decreases
94. The property of a capacitor to store electricity is called its
A. capacitance
B. charge
C. energy
D. none of the above
A. capacitance
95. 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
B. Capacitance
96. A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is
A. 0.2 s
B. 0.4 s
C. 0.6 s
D. 0.8 s
D. 0.8 s
97. In a cable capacitor, voltage gradient is maximum at the surface of the
A. earth
B. conduction
C. sheath
D. insulator
B. conduction
98. 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
D. conductors separated by an insulator
99. The time constant of an R-C circuit is defined as the time during which
capacitor charging voltage actually rises to ______ percent of its______value.
A. 37, initial
B. 63.2, initial
C. 63.2, final
D. 37, final
C. 63.2, final
100. The time constant and R-C circuit may also be defined as the time during
which the charging current falls to ______ percent of its initial maximum value,
A. 37
B. 42
C. 63
D. 73
A. 37
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