Online Objective Test on Alternating Current and Voltage - Set 01

Practice Test: Question Set - 01


1. A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is
    (A) 6 V
    (B) 30 V
    (C) 35 V
    (D) 0 V

2. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
    (A) 25 kHz
    (B) 12 kHz
    (C) 18 kHz
    (D) 1.3 MHz

3. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?
    (A) Wave A leads wave B by 15°
    (B) Wave A lags wave B by 15°
    (C) Wave A leads wave B by 105°
    (D) Wave A lags wave B by 105°

4. A ramp is the type of waveform characterized by a non-linear increase or decrease in voltage or current.
    (A) True
    (B) False

5. If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is
    (A) 5.44 V
    (B) 54.4 V
    (C) 7.07 V
    (D) 8 V

6. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is
    (A) 45.12 mA
    (B) 16 mA
    (C) 39.6 mA
    (D) 22.6 mA

7. The unit of frequency is the hertz.
    (A) True
    (B) False

8. If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is
    (A) 4 V
    (B) 18.8 V
    (C) 26.6 V
    (D) 2.66 V

9. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is
    (A) 40 Hz
    (B) 100 Hz
    (C) 400 Hz
    (D) Indeterminable

10. If a sine wave goes through 10 cycles in 20 μs, the period is
    (A) 20 μs
    (B) 4 μs
    (C) 2 μs
    (D) 100 μs

11. Amplitude is the maximum value of a voltage or current.
    (A) True
    (B) False

12. How many degrees are there in π/3 rad?
    (A) 6°
    (B) 60°
    (C) 180°
    (D) 27°

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