SINGLE PHASE TRANSFORMER

Which one is incorrect,

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A Step-Up Transformer which has 110/220 turns.What would happen if we replace it with 10/20 turns? (because Turns ratio would be same in both cases)

• induced E.M.F wold be same

• Induced E.M.F would be decreased

• Induced E.M.F would be increased

• None of the above

In Single Phase Transformer, The Primary Current and Primary Voltage is 4.55 and 11kV respectively. The Rating of the transformer would be________?

• 50kVA

• 86kVA

• 100kVA

• 150kVA

For 2kVA 100/1000 V transformer, High voltage full rated current is

• 20 A

• 2 A

• 200 A

• Can not be evaluated

Which one is not the condition for ideal transformer.

• Resistance of primary and secondary winding must be zero

• Leakage flux must be zero.

• Permeability must be zero.

• Eddy current and Hysteresis losses must be zero.

The transformer ratings are usually expressed in terms of

• Volts

• Amperes

• kW

• kVA

A step-up transformer increases........

• Power

• Current

• Voltage

• Frequency

For a transformer with number of secondary windings more than the number of primary windings, the secondary current will be _____________ ?

• More than the primary current

• Less than the primary current

• Equal to the primary current

• Zero

Single phase transformers work on principle of 

• convention
• heat transfere
• mutual induction
• repulsion

Step-up single phase transformers increases ....... voltages

• primary
• secondary
• primary and secondary
• non