Free Printable AC Fundamentals

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AC Fundamentals

Total questions: 19

Worksheet time: 13mins

Name

Class

Date

A function that repeats itself after fixed intervals is said to be:

a phasor

harmonic

periodic

reactive

If v₁ = 30 sin(ωt + 10°) and v₂ = 20 sin(ωt + 50°), which of these statements are true?

v₁ leads v₂

v₂ leads v₁

v₂ lags v₁

v₁ lags v₂

v₁ and v₂ are in phase

The imaginary part of impedance is called:

resistance

admittance

susceptance

conductance

reactance

The impedance of a capacitor increases with increasing frequency.

True

False

Which of the following is not a right way to express the sinusoid $A\ \cos\omega t$ ?

$A\cos\ 2\pi ft$

$A\ \cos\left(\frac{2\pi t}{T}\right)$

$A\ \cos\omega\left(t-T\right)$

$A\ \sin\left(\omega t=90\right)$

The power consumed in a pure inductive circuit is (a)

Which of these frequencies has the shorter period?

1 Krad/s

1 Khz

If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

Sine wave of same frequency

Sine wave of half the original frequency

Sine wave of double the original frequency

Not a sine wave

Peak factor for a sine wave is (a) (Note: answer with three decimal place accuracy)

10.

A sine wave has a positive going zero crossing at $0\degree$ and an rms value of 20 V. What is the instantaneous value at $145\degree$ ?

7.32 V

16.22 V

26.57 V

21.66 V

11.

A current is said to be alternating when it changes in

magnitude

direction

both ‘a’ and ‘b’

none of these

12.

If the peak value of a sine wave is 100 V, then its RMS value will be

88 V

70.7 V

63.6 V

100 V

13.

A voltage of v = 100 sin (wt + π/3) is applied to pure resistor of 30 Ohm. What is the RMS value of current?

4.71 A

5.77 A

1.92 A

2.36 A

14.

The rms value of sine wave is 100 A. Its peak value is ___

70.7 A

141.4 A

150 A

282.8 A

15.

An alternating voltage = 140 sinθ is supplied to a device which offers a resistance of 20 Ω in forward direction of current in reverse direction. Calculate the form factor.

0.57

0.318

1.11

1.414

16.

The phase angle difference between current and voltage is 90^o, the power will be ________

minimum

maximum

zero

17.

If one cycle of AC waveform occurs every millisecond, the frequency will be ________

100 Hz

1000 Hz

50 Hz

10 kHz

18.

Two sinusoidal quantities are said to be in phase quadrature, when their phase difference is __________

0^o

30^o

45^o

90^o

19.

The equation for 25 cycles current sine wave having rms value of 30 amps, will be _________________

42.4 sin 50πt

30 sin 50πt

30 sin 25πt

42.4 sin 25πt

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AC Fundamentals

Total questions: 19

Worksheet time: 13mins

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