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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
18
0.18
0.018
5.5
Answer
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Related Question
Transformers
In a power or distribution transformer about 10 per cent end turns are heavily insulated
None of these
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to reflect the line surge and save the winding of a transformer from damage
to absorb the line surge voltage and save the winding of transformer from damage
None of these
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to reflect the line surge and save the winding of a transformer from damage
to absorb the line surge voltage and save the winding of transformer from damage
Answer
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Transformers
The dielectric strength of transformer oil is expected to be
33 kV
330 kV
lkV
100 kV
33 kV
330 kV
lkV
100 kV
Answer
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Transformers
A transformer operates poorly at very low frequencies because _____
Primary reactance is too much increased
Magnetising current is abnormally high
Permeability of core is increased
None of the listed here
Primary reactance is too much increased
Magnetising current is abnormally high
Permeability of core is increased
None of the listed here
Answer
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Transformers
Which of the following protection is normally not provided on small distribution transformers?
Buchholz relay
Overfluxing protection
All of these
Overcurrent protection
Buchholz relay
Overfluxing protection
All of these
Overcurrent protection
Answer
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Transformers
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?
73 V
88 V
880 V
7.3 V
73 V
88 V
880 V
7.3 V
Answer
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