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Electrical Engineering - Transformers

Exercise : Transformers - General Questions
6.
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?
8.8 V
88 V
880 V
8,800 V
Answer: Option
Explanation:

V2/V1 = N2/N1

Turns ratio = N2/N1 = 8.

V2/110 = 8

V2 = 8 x 110

V2 = 880v.

7.
To step 110 V ac down to 20 V ac, the turns ratio must be
5.5
18
0.18
0.018
Answer: Option
Explanation:

Vp/Vs = Np/Ns

Vs = (Ns/Np)Vp

We required turns ratio i.e., (Ns/Np)

= Vs/Vp

= 20/110

= 0.181818182

[Note: p - primary; s - secondary]

For step down transfer, the turns ratio will be less than 1.

For simulation: Step-Down Transformer Circuit Simulator.

8.
The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is
2 mH
2 H
4 H
8 H
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
25 W
0 W
250 W
2.5 W
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?
7.3 V
73 V
88 V
880 V
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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