Q.151 The impedance of purely resistive circuit is given by in polar form ___and rectangular form__.
A. Z = R and Z = RΩ =(R+j0)Ω
B. Z = R ∠ 0º and Z = RΩ =(R+jX)Ω
C. Z = R ∠ 0º and Z = RΩ =(R+j0)Ω
D. Z = R ∠ 0º and Z = RΩ =jX Ω
Ans.: C
Q.152 The rectangular form and polar form of impedance of purely inductive circuit is expressed by__
A. Z = jXL and Z= XL and Z = XL∠0° Ω
B. Z = jXL and Z= XL and Z = XL ∠90° Ω
C. Z = R and Z= XL and Z = XL ∠90° Ω
D. Z = jXL and Z= XL and Z = RL ∠90° Ω
Ans.: B
Q.153 When the load connected to ac is purely resistive, the reactive part is ___.
A. zero
B. infinite
C. not defined
D. equal to resistive part
Ans.: A
Q.154 In purely inductive circuit X = XL because of
A. the resistive part is infinite
B. the resistive part is zero
C. the inductive part is zero
D. inductive part is infinite
Ans.: B
Q.155 In pure inductive circuit with ac supply the current lags behind voltage by
A. л/4
B. л/6
C. л/2
D. 2л
Ans.: C
Q.156 The inductive reactance XL depends directly on ___ of the voltage.
A. frequency
B. angular momentum
C. acceleration
D. magnitude
Ans.: A
Q.157 In inductive circuit, power wave is a sine wave of frequency __ that of the current and voltage.
A. same as
B. double
C. Three times
D. four times
Ans.: B
Q.158 what is the phase difference between the voltage and current of ac circuit consist only capacitor?
A. 90°
B. 45°
C. 180°
D. 270°
Ans.: A
Q.159 In a purely capacitive circuit current ____voltage by__
A. lags, 90
B. leads, 90
C. in phase
D. out of phase
Ans.: B
Q.160 The ______is defined as the opposition offered by a purely capacitive circuit to the flow of sinusoidal current.
A. capacitive reactance
B. capacitance
C. capacitive inductance
D. capacitor
Ans.: A
Q.161 The capacitive reactance is the ratio of _______in a purely capacitive circuit.
A. rms value of current to rms value of voltage
B. rms value of voltage to rms value of current
C. average value of voltage to average value of current
D. maximum value of current to rms value of voltage
Ans.: B
Q.162 Capacitive reactance is measured in____.
A. Henry
B. Farad
C. Ohms
D. Weber
Ans.: C
Q.163 Which of the following represent ohm’s law for purely capacitive circuit?
A. V = XcI
B. v = XI
C. V = I
D. Xc = I/V
Ans.: A
Q.164 The part of the supply voltage which charges the capacitor is known as____.
A. voltage drop Vr
B. voltage rise V
C. capacitive voltage drop Vc
D. capacitive voltage rise Vcr
Ans.: C
Q.165 A pure capacitor has its leakage resistance equal to___.
A. finite value
B. infinite value
C. capacitance
D. unity
Ans.: B