Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 5

Score
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Rank
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TIME Taken - -

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Question 1
1 / -0

Alternating current cannot be measured by a DC ammeter because

A
AC cannot pass through the DC ammeter

B
AC changes direction

C
the average value of current for a complete cycle is zero

D
the DC ammeter will get damaged

Solution

A full cycle of alternating current consists of two half cycles. For one half, current is positive and for second half, current is negative. Therefore, for an AC cycle, the net value of average current is zero. However, for the half cycle, the value of current is different at different points. Hence, alternating current cannot be measured by a DC ammeter.
Question 2
1 / -0

An ideal transformer is supplied with a primary input power of 10 kilowatt. When the transformer is on load, the secondary current is 24 A. What is the potential difference applied to the primary if the primary to secondary turns ratio is 4 : 1?

A
2045.1 V

B
1666.7 V

C
1125.2 V

D
2265.6 V

Solution

E_p ×I_p = 10 kW = 10 × 10³ W = 10⁴ W
I_s = 24 A
n_p/n_s = 4/1
n_p/n_s = I_s/I_p
4/1 = 24/I_p
I_p = 6 A
E_p = 10⁴/6 = 1666.7 V