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Transformers

Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

0.4
5
0.2
25

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Transformers
The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is

8 μH
2 mH
4 μH
2 μH

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Transformers
Which of the following transformer should never have the secondary open circuited while the primary is energised?

Potential transformer
Auto transformer
Power transformer
Current transformer

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Transformers
To step 110 V ac down to 20 V ac, the turns ratio must be

18
0.18
0.018
5.5

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Transformers
A transformer operates poorly at very low frequencies because _____

Permeability of core is increased
Magnetising current is abnormally high
None of the listed here
Primary reactance is too much increased

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Transformers
The no load primary current is about ______of full load primary current.

15-30%
30-40%
Above 40%
3-5%

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