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Electrical Engineering - Transformers

Exercise : Transformers - General Questions
11.
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
9 V
90 V
900 V
0.9 V
Answer: Option
Explanation:

We know that, V2/V1 = N2/N1.

Given V2 = 9v, N2/N1 = 0.1

Therefore, 9v/V1 = 0.1

V1 = 9v/0.1 = 90v.

For more detail: Step Down Transformer - Circuit with Simulation.

12.
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is
one-fourth the primary current
four times the primary current
equal to the primary current
one-fourth the primary current and equal to the primary current
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is
1.7 V
0.85 V
1 V
0 V
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?
2 V
20 V
180 V
18 V
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
The primary winding of a power transformer should always be
open
shorted
switched
fused
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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