ii)Transformer Tx1 rated for 400 V/120 V, 1 kVA is connected in parallel with Tx2 rated for: 400 V/120 V, 2 kVA transformer and the combination is to be tested at different load conditions. The nearest integer values of full load currents of the transformers at the low voltage sides are: _______________. (Tx1:5 A) & (Tx2:5 A) (Tx1:10 A) & (Tx2:10 A) (Tx1:5 A) & (Tx2:10 A) (Tx1:10 A) & (Tx2:15 A) iii) Which of the following is a condition to be satisfied for connecting two 3-phase transformers in parallel.: Both transformers should have same weight None of the answers Both transformers should have same frequency Both transformers should have same power rating
Q1:
i)
Following are the wattmeter readings when a 2 kVA transformer and a 5 kVA transformer were connected in parallel to supply a common load. Total power delivered to the load is 1455 Watts. Then, the best possible combination of readings of the wattmeters will be:
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W1= 550 watts; W2= 205 watts; W3= 200 Watts; W4 = 500 watts |
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W1= 500 watts; W2= 225 watts; W3= 220 Watts; W4 = 500 watts |
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W1= 200 watts; W2= 205 watts; W3= 550 Watts; W4 = 500 watts |
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W1= 200 watts; W2= 550 watts; W3= 205 Watts; W4 = 500 watts |
ii)Transformer Tx1 rated for 400 V/120 V, 1 kVA is connected in parallel with Tx2 rated for: 400 V/120 V, 2 kVA transformer and the combination is to be tested at different load conditions. The nearest integer values of full load currents of the transformers at the low voltage sides are: _______________.
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(Tx1:5 A) & (Tx2:5 A) |
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(Tx1:10 A) & (Tx2:10 A) |
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(Tx1:5 A) & (Tx2:10 A) |
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(Tx1:10 A) & (Tx2:15 A) |
iii)
Which of the following is a condition to be satisfied for connecting two 3-phase transformers in parallel.:
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Both transformers should have same weight |
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None of the answers |
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Both transformers should have same frequency |
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Both transformers should have same power rating |
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