HPSSC Lineman, SSA, Electrician Online Mock Test

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 HPSSC Lineman, SSA(Sub Station Attendant), Electrician Online Mock Test

here we provide you [HPSSC Lineman, SSA, Electrician Online Mock Test, HPSSC Lineman, Sub Station Attendant, Electrician Online Mock Test]

A 100V/10V,50 VA transformer is converted to 100V/110 autotransformer, the rating of the autotransformer will be

550 VA

500VA

110VA

100VA

 

A transformer has maximum efficiency at full load, when iron losses are 800 watts, copper losses at half load will be

1600W

800W

400W

200W

 

The purpose of the conservator in a transformer is

To cool the winding.

To prevent moisture in the transformer.

To prevent short circuit of primary and secondary winding.

To take up contraction and expansion of oil.

 

In case of a power transformer, the no-load current i terms of rated current is

10 to 20%

2 to 6%

15 to 30%

30 to 50%

 

If copper loss of transformer at 7/8^th full load is 4900W, then its full load copper loss would be

5600W

6400W

373W

429W