Alternating Current Test

Result

Alternating Current Test - 9

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Weekly Quiz Competition

Question 1
4 / -1

The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is

A
3 V/m

B
6 V/m

C
9 V/m

D
12 V/m

Solution
Question 2
4 / -1

A hot wire ammeter reads 10 A in an AC circuit. The peak value of the current will be

A

B

C

D

Solution
Question 3
4 / -1

A
22 mA

B
33 mA

C
42 mA

D
12 mA

Solution
Question 4
4 / -1

The peak value of an alternating current is 5 A and its frequency is 60 Hz. Find its rms value and time taken to reach the peak value of current starting from zero.

A
3.536 A, 4.167 ms

B
3.536 A, 15 ms

C
6.07 A, 10 ms

D
2.536 A, 4.167 ms

Solution
Question 5
4 / -1

What is the average value of the AC voltage over one complete cycle?

A
zero

B
V_max

C

D

Solution
Question 6
4 / -1

A telephone wire of length 200 km has a capacitance of 0.014 μF per km. If it carries an AC frequency 5 kHz, what should be the value of an inductor required to be connected in series so that the impedance of the circuit is minimum?

A
0.35 mH

B
3.5 mH

C
2.5 mH

D
zero

Solution
Question 7
4 / -1

The maximum voltage in DC circuit is 282V.The effective voltage in AC circuit will be

A
200 V

B
300 V

C
400 V

D
564 V

Solution
Question 8
4 / -1

Alternating current cannot be measured by DC ammeter because

A
AC cannot pass through DC ammeter

B
AC changes direction

C
average value of current for complete cycle is zero

D
DC ammeter will get damaged
Question 9
4 / -1

An AC voltage source of variable angular frequency w and fixed amplitude V₀, is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased

A
the bulb glows dimmer

B
the bulb glows brighter

C
total impedance of the circuit is unchanged

D
total impedence of the circuit increases

Solution
Question 10
4 / -1

A capacitor and an inductance coil are connected in separate AC circuits with a bulb glowing in both the circuits. The bulb glows more brightly when

A
an iron rod is introduced into the inductance coil

B
the number of turns in the inductance coil is increased

C
separation between the plates of the capacitor is increased

D
a dielectric is introduced into the gap between the plates of the capacitor

Solution