Alternating Current Test

Result

Alternating Current Test - 37

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Question 1
4 / -1

The potential difference V and the current iflowing through an instrument in an ac circuit of frequency f are given by V = 5 cosωt volts and I = 2 sin ωt amperes (where w = 2 πf). The power dissipated in the instrument is

A
Zero

B
10 W

C
5 W

D
2.5 W

Solution
Question 2
4 / -1

If instantaneous current is given by i = 4 cos (ωt + Φ)) amperes, then the r.m.s. value of current is

A
4 amperes

B

C

D
Zero amperes

Solution
Question 3
4 / -1

A generator produces a voltage that is given by V = 240 sin 120 t, where t is in seconds. The frequency and r.m.s. voltage are

A
60 Hz and 240 V

B
19 Hz and 120 V

C
19 Hz and 170 V

D
754 Hz and 70 V

Solution
Question 4
4 / -1

If E₀ represents the peak value of the voltage in an ac circuit, the r.m.s. value of the voltage will be

A

B

C

D
Question 5
4 / -1

A sinusoidal ac current flows through a resistor of resistance R. If the peak current is I_p, then the power dissipated is

A

B

C

D

Solution
Question 6
4 / -1

200 V, 50 Hz, ac is applied to a resistor. The instantaneous value of voltage is

A

B

C

D

Solution
Question 7
4 / -1

The r.m.s. value of an ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be

A

B

C

D

Solution
Question 8
4 / -1

The root mean square value of the alternating current is equal to

A
Twice the peak value

B
Half the peak value

C
1/2 times the peak value

D
Equal to the peak value
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

In general in an alternating current circuit

A
The average value of current is zero

B
The average value of square of the current is zero

C
Average power dissipation is zero

D
The phase difference between voltage and current is zero