Alternating Current Test

Result

Alternating Current Test - 45

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Weekly Quiz Competition

Question 1
4 / -1

The power is transmitted from a power house on high voltage ac because

A
Electric current travels faster at higher volts

B
It is more economical due to less power wastage

C
It is difficult to generate power at low voltage

D
Chances of stealing transmission lines are minimized

Solution
Question 2
4 / -1

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

A
Zero

B
10 W

C
5 W

D
2.5 W

Solution
Question 3
4 / -1

A
10⁴ watt

B
10 watt

C
2.5 watt

D
5 watt

Solution
Question 4
4 / -1

The resistance of a coil dc is in ohms. In ac, the resistance

A
Will remain same

B
Will increase

C
Will decrease

D
Will be zero

Solution
Question 5
4 / -1

In an ac circuit, peak value of voltage is 423 volts. Its effective voltage is

A
400 volts

B
323 volts

C
300 volts

D
340 volts

Solution
Question 6
4 / -1

Power dissipated in an LCR series circuit connected to an ac source of emf E is

A

B

C

D

Solution
Question 7
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
75 Hz and 70 V

Solution
Question 8
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 9
4 / -1

The peak value of 220 volts of ac mains is

A
155.6 volts

B
220.0 volts

C
311.0 volts

D
440 volts

Solution
Question 10
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