Q.1

If the peak of a sine wave isV, the peak-to-peak value is

  • 6.5 V
  • 13 V
  • 26 V
  • none of the above
Q.2

A phasor represents

  • the magnitude and a quantity direction
  • the width of a quantity
  • the phase angle
  • the magnitude of a quantity
Q.3

To produce anHz sine wave, a four-pole generator must be operated at

  • 200 rps
  • 400 rps
  • 800 rps
  • 1,600 rps
Q.4

A sawtooth wave has a period ofms. Its frequency is

  • 10 Hz
  • 50 Hz
  • 100 Hz
  • 1,000 Hz
Q.5

The average half-cycle value of a sine wave with aV peak is

  • 25.48 V
  • 6.37 V
  • 14.14 V
  • 50.96 V
Q.6

A sinusoidal current has an rms value ofmA. The peak-to-peak value is

  • 45.12 mA
  • 16 mA
  • 39.6 mA
  • 22.6 mA
Q.7

The average half-cycle value of a sine wave with aV peak is

  • 25.48 V
  • 6.37 V
  • 14.14 V
  • 50.96 V
Q.8

One sine wave has a positive-going zero crossing atand another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

  • 45°
  • 40°
  • none of the above
Q.9

One sine wave has a positive-going zero crossing atand another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

  • 45°
  • 40°
  • none of the above
Q.10
AC stands for
  • Air-conditioner
  • Direct Current
  • Alternating Current
  • Alternating Voltage
Q.11
Power Factor (Cos θ) =_________?
  • R/Z
  • The Cosine of angle between rms Current and rms voltage
  • Both A and B
  • Neither A nor B
Q.12
A pure capacitor is connected to an AC power supply. In this circuit, the current
  • leads the voltage by 90°.
  • lags the voltage by 90°.
  • is in phase with the voltage.
  • none of the given answers
Q.13
What words are missing from the following statement? The impedance of a series RCL circuit at resonance will be _______ and equal to the circuit _______ .
  • Minimum and resistance.
  • Maximum and resistance.
  • Minimum and reactance.
  • Maximum and reactance
Q.14
Battery is
  • AC source
  • DC source
  • none of the above
  • all of the above
Q.15
In a circuit containing resistance only, the voltage and current are ____________________ with oneanother.
  • together
  • anti phase
  • in phase
  • full rotation
Q.16
The power factor is the ratio of __________________ power to _________________ power.
  • true and apparent
  • true and real
  • positive and negative
  • factor and real
Q.17
The current in an inductive circuit _____.
  • is faster than the voltage
  • is the same as the voltage
  • lags the voltage
  • counteracts the voltage
Q.18
When frequency decreases, capacitive reactance _____.
  • increases
  • decreases
  • remains the same
  • may increase or decrease
Q.19
Which of the following is true of the current in a capacitive circuit?
  • It leads the voltage.
  • It lags the voltage.
  • It is the same as the voltage.
  • It counteracts the voltage.
Q.20
Inductive reactance increases as the _____.
  • frequency increases
  • frequency decreases
  • impedance increases
  • impedance decreases
Q.21
The power factor can be defined as the ratio of true power to _____.
  • apparent power
  • total resistance
  • total current
  • reactive power
Q.22
What does RC stand for?
  • Remote Control
  • Radio Control
  • Resistor Capacitor
  • Rotary Club
Q.23
The unit of inductive reactance is :
  • Ohm
  • Ampere
  • Farad
  • Henry
Q.24
What does RMS means?
  • Really Monday Stinks
  • Root Minus Square
  • Root Mean Square
  • Root Minus Subtraction
Q.25
An A.C source is connected to a resistive circuit. Which of the following is true ?
  • Current leads the voltage and both are in same phase
  • Current lags behind the voltage and both are in same phase
  • Current and voltage are in same phase
  • Any of the above may be true depending upon the value of resistance
Q.26
A pure capacitor of capacitance C is connected to an a.c. supply of peak voltage VWhich pair of expressions below are for the voltage and current in the circuit?
  • V=V0 sin⁡ (ωt+π2)V=V_0\ \sin\ \left(\omega t+\frac{\pi}{2}\right)V=V0​ sin (ωt+2π​) I=I0 sin⁡ωtI=I_0\ \sin\omega tI=I0​ sinωt
  • V=V0 sin⁡ (ωt+π2)V=V_0\ \sin\ \left(\omega t+\frac{\pi}{2}\right)V=V0​ sin (ωt+2π​) I=I0 cos⁡ ωtI=I_0\ \cos\ \omega tI=I0​ cos ωt
  • V=V0 sin⁡ ωtV=V_0\ \sin\ \omega tV=V0​ sin ωt I=I0cos⁡ ωtI=I_0\cos\ \omega tI=I0​cos ωt
  • V=V0 sin⁡ ωtV=V_0\ \sin\ \omega tV=V0​ sin ωt I=I0 sin⁡ ωtI=I_0\ \sin\ \omega tI=I0​ sin ωt
Q.27
A pure inductor is connected to an a.c. source of frequencyHz and the r.m.s. value of the voltage isV. If the peak value of the current flowing through the inductor isA, what is the inductance of the inductor?
  • 1.6 mH
  • 1.9 mH
  • 30 mH
  • 39 mH
Q.28
A pure inductor of inductanceH is connected to an a.c.s source of frequencyHz. If the r.m.s. value of the voltage isV, what is the maximum instantaneous output power?
  • 1.3 ×10−3W\times10^{-3}W×10−3W
  • 1.5 ×10−2W\times10^{-2}W×10−2W
  • 0 W
  • 1.5 W
Q.29
A pure capacitor is connected to an a.c. supply of frequencyHz and r.m.s. voltage 6.0 V. If the r.m.s. value of the current in the circuit ismA, what is the capacitance of the capacitor?
  • 13 μ\muμ F
  • 14 \muμ F
  • 15 \muμ F
  • 16 \muμ F
Q.30
An electrical element X when connected to an alternating voltage source has current through it leading the voltage by 2radian. Identify X
  • Capacitor
  • Resistor
  • Inductor
  • Series LR circuit
0 h : 0 m : 1 s