Alternating Current Test

Result

Alternating Current Test - 10

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

The voltage across the terminals of an ac power supply varies with time according to Vcosωt. The voltage amplitude is V = 45.0 V. Average potential difference between the two terminals of the power supply is

A
0 V

B
37.8 V

C
33.8 V

D
35.8 V

Solution

Average value of AC voltage for a half cycle is positive and similarly, the mean value of AC voltage for other half cycle is negative.
Average potential difference between the two terminals for complete full cycle,
V_av= (0.637V₀) + (−0.637V₀) = 0V
Question 2
1 / -0

Reactance of a 3 H inductor at a frequency of 80.0 Hz is

A
1500 Ω

B
1480 Ω

C
1508 Ω

D
1490 Ω

Solution

L = 3 H, f = 80 Hz
Inductive reactance, X_L= ωL= 2πfL= 2 × 3.14 × 80 × 3 = 1508Ω