• 73%
• 57%
• 173%
• 157%
• #### 2.  Operating transformers in parallel gives the advantage of ___________

• increased capacity of power system
• reducing the capacity of substation
• all of the mentioned
• #### 3.  Which of the following is a shortcoming for using parallel connected transformers?I. Reliable loadingII. Increased capacity of power systemIII. Reducing the capacity of substation

• I, II, III
• I, II
• I, III
• None of the mentioned
• #### 4.  Two single phase transformers A and B are operating in parallel having same impedance. But the x/r ratio of them are not equal and xa > xb. Then?

• A has poorer pf than B
• B has poorer pf than B
• lesser power factor angle
• both operate at same power factor
• #### 5.  Which if the conditions is must be fulfilled for satisfactory parallel operation of transformers?

• Same voltage ratio
• Leakage impedances should be inversely proportional to kVA of the transformer
• Same pu impedance
• Correct polarity
• #### 6.  Identify the correct order for the voltage transformation for the three-phase transformers.

• D-Y > D-D = Y-Y > Y-D
• D-Y > D-D > Y-Y > Y-D
• D-Y > D-D = Y-Y < Y-D
• D-Y > D-D < Y-Y < Y-D

• 73%
• 57%
• 173%
• 157%

• A, B, C
• C
• A, B
• B, C
• #### 9.  Transformer operating in parallel will share a common load in the best possible manner if ____________

• leakage impedances are proportional to their kVA rating
• pu leakage impedances are equal
• leakage impedances are equal
• any of the mentioned
• #### 10.  Two single phase transformers A and B are operating in parallel having same impedance. But the x/r ratio of them are not equal. Then total kVA output of the output will be ___________

• less than sum of kVA of A and B
• more than sum of kVA of A and B
• equal to sum of kVA of A and B
• any of the mentioned

• 1230 kVA
• 1440 kVA
• 1680 kVA
• 1150 kVA

• 120°, 90°
• 180°, 90°
• 120, 120°
• 120°, 180°
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