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GATE EE 2021 : Electrical Machines Quiz 5 (App update required to attempt this test)
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Question 1
If a transformer core has air gaps, then
Question 2
A transformer having 1000 turns is connected to a 250 V ac supply for a secondary voltage of 400 V. Then the number of secondary turns should be
Question 3
A transformer has hysteresis loss of 30 Watts at 240 V 60 Hz supply. The hysteresis loss at 200V, 50 Hz supply is
Question 4
The maximum efficiency for a transformer occurs at 80% of full load. It’s core loss is Pc and ohmic losses is Poh. For this transformer, what will be the value of ratio Pc/Poh.
Question 5
The daily variation of load on a 100 KVA transformer is as follows:
8:00 AM to 1 PM – 65 kW, 45 KVAR
1 PM to 6 PM – 80 kW, 50 KVAR
6 PM to 1 AM – 30 kW, 30 KVAR
1 AM to 8 AM – No load
This transformer has no load are loss of 270 W and a full load ohmic loss of 1200 W. The all-day efficiency of the transformer is
Question 6
A transformer has a reactance of 0.1 pu and negligible resistance. What is its voltage regulation at full load, and 0.8 power factor lagging?
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Oct 8ESE & GATE EE