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Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
2,400 V
240 V
12 V
120 V
2,400 V
240 V
12 V
120 V
Answer
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Related Question
Transformers
In a power or distribution transformer about 10 per cent end turns are heavily insulated
to reflect the line surge and save the winding of a transformer from damage
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
None of these
to absorb the line surge voltage and save the winding of transformer from damage
to reflect the line surge and save the winding of a transformer from damage
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
None of these
to absorb the line surge voltage and save the winding of transformer from damage
Answer
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Transformers
In a transformer the resistance between its primary and secondary is
1 ohm
Infinite
Zero
1000 ohms
1 ohm
Infinite
Zero
1000 ohms
Answer
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Transformers
Efficiency of a power transformer is of the order of
100 per cent
50 per cent
98 per cent
25 per cent
100 per cent
50 per cent
98 per cent
25 per cent
Answer
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Transformers
Material used for construction of transformer core is usually
Aluminium
Silicon steel
Wood
Copper
Aluminium
Silicon steel
Wood
Copper
Answer
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Transformers
The efficiencies of transformers compared with that of electric motors of the same power are
somewhat smaller
about the same
much smaller
much higher
somewhat smaller
about the same
much smaller
much higher
Answer
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