TCEE_TKT

The secondary winding of which of the following transformers is always kept closed?

• Current transformer
• Voltage transformer
• Power transformer
• Step down transformer

If supply frequency of a transformer increases, the secondary output voltage of the transformer

• Increase
• Decrease
• Remain the same
• Any of the above

Power transformers are designed to have maximum efficiency at

• Full load
• 50% load
• 80% load
• no load

The open circuit test in a transformer is used to measure

• Copper loss
• Winding loss
• total loss
• core loss

The essential condition for parallel operation of two single-phase transformer is that they should have the same

• KVA Rating
• Turn Ratio
• Polarity
• Both 2 & 3

During open circuit test (OC) of a transformer _____________

• primary is supplied rated kVA
• primary is supplied full-load current
• primary is supplied current at reduced voltage
• primary is supplied rated voltage

Why OC test is performed on LV side?

• Simple construction

• Less voltage is required and parameters can be transformed to HV side

• It’ll not give losses ig conducted on HV side

• HV side does not have connections for voltages

In OC test all the power supplied is utilised for ______

• Core losses
• Iron losses
• Windage losses
• Cannot be determined above

The total core loss can be termed as ____________

• Eddy current loss
• Hysteresis loss
• Copper loss
• Magnetic loss

While conducting short-circuit test on a transformer which side is short circuited?

• High voltage side
• Low voltage side
• Primary side
• Secondary side