Q.166 The reactance offered by a pure capacitor to the direct current or voltage is ___
A. finite value
B. infinite value
C. unity
D. not defined
Ans.: B
Q.167 Capacitor is equivalent to an open circuit for __
A. alternating current or voltage
B. alternating power
C. direct current or voltage
D. all of the above
Ans.: C
Q.168 The average power demand in a purely capacitive circuit over one cycle is___
A. always finite value
B. always zero
C. always infinite value
D. Depend upon capacitive load
Ans.: B
Q.169 The net energy supplied to pure capacitor over a complete cycle is zero because of___
A. In positive half of the power waveform the capacitor charges and stores electrostatic energy
B. In the negative half cycle of the power waveform the capacitor discharges and returns back the stored energy to ac source
C. The area under the positive and negative half cycle of the instantaneous power waveform are exactly eaual
D. all of the above
Ans.: D
Q.170 which of the following expression is correct for rectangular form of impedance of a purely capacitive circuit?
A. Z = jX
B. Z = -jX
C. Z = R-jX
D. Z = R+X
Ans.: B
Q.171 In purely capacitive circuit, the resistive part is__
A. infinite
B. finite
C. zero
D. unity
Ans.: C
Q.172 Polar form of impedance of purely capacitive circuit is give by___
A. Z = ∠-90°
B. Z = Xc ∠90°
C. Z = Xc ∠0°
D. Z = Xc ∠-90°
Ans.: D
Q.173 Find the reactance offered by the capacitor if a 50µF capacitor is connected across a 230 V, 50 Hz supply.
A. 636.6Ω
B. 63.66Ω
C. 6.366Ω
D. 0.6366Ω
Ans.: B
Q.174 If the frequency of the supply is increase then reactance of inductive circuit is ___
A. decrease
B. remain same
C. increase
D. inductive reactance does not depend on supply frequency
Ans.: C
Q.175 what is the relation between capacitive reactance and supply frequency?
A. inversely proportional
B. directly proportional
C. capacitive reactance is directly proportional to square of supply frequency
D. capacitive reactance is inversely proportional to square of supply frequency
Ans.: A
Q.176 In pure capacitive circuit the applied voltage is __
A. leads the current by л/2
B. out of phase
C. in phase with current
D. lags the current by л/2
Ans.: D
Q.177 What is value of reactance of capacitor of a 2µF capacitor of 2.5 kHz?
A. 15.91Ω
B. 1591Ω
C. 159.1Ω
D. 1.591Ω
Ans.: B
Q.178 What is impedance?
A. To defined a combination of R, XL, Xc
B. To defined a combination of XL, Xc
C. To defined a combination of R, XL,
D. To defined a combination of R, Xc
Ans.: A
Q.179 The unit of impedance (Z) is
A. Weber per meter
B. Henry per meter
C. ohm per meter
D. ohm
Ans.: D
Q.180 Which of the following expression is/are correct?
A. Xc = 1/2лfC
B. Xc 1/ωC
C. Both A and B
D. Xc = 1/2fC
Ans.: C
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