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UPPCL EE :Electrical Machines Quiz 1

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Question 1

Two transformers, each rated at 200 kVA, 11kV/400V and 50 Hz are connected in open delta on both the primary and secondary, the load kVA that can be supplied from this transformer connection will be

Question 2

A single phase transformer has no-load voltage and no-load current as 230 V and 3.623 A respectively. If the core loss is 500 W, then determine the shunt branch parameters R₀ ad X_m.

Question 3

When a transformer is first energized, the transient current during first few cycles, is

Question 4

The voltage regulation of a transformer having 2% resistance and 5% reactance, at full load, 0.8 pf lagging is

Question 5

If the percentage impedance of the two transformers working in parallel are different then

Question 6

For a Scott connection,

Question 7

Cores of large power transformers are made from which one of the following?

Question 8

A ∆/∆ connected transformer is connected to V/V connected transformer. The ratio of VA rating of V/V connected transformer and ∆/∆ connected transformer is

Question 9

In a transformer, ____harmonic is rich in magnetic inrush.

Question 10

A 250/500 V, 25 kVA, 50 Hz, transformer is connected as an autotransformer of rating 750/250 V. Determine the current in the common winding and kVA rating of the autotransformer when a load of 25 kVA, 0.6 P.f lag is connected to 250 V terminal.

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