1
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
A differentially compounded d.c. motor with interpoles and with brushes on the neutral axis is to be driven as a generator in the same direction with the same polarity of the terminal voltage. It will then
A
be a cumulatively compound generator but the interpole coil connections are to be reversed
B
be a cumulatively compounded generator without reversing the interpole coil connections.
C
be a differentially compounded generator without reversing the interpole coil connections
D
be a differentially compounded generator but the interpole coil connections are to be reversed.
2
GATE EE 1995
Numerical
+1
-0
The percentage impedance of a 100 kVA, 11 kV/400V, delta/wye, 50 Hz transformer is 4.5%. For the circulation of half the full load current during short circuit test, with low voltage terminals shorted, the applied voltage on the high voltage side will be __________.
Your input ____
3
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
Supply to one terminal of a $$\triangle$$ - Y connected three-phase core type transformer which is on no-load, fails. Assuming magnetic circuit symmetry, voltages on the secondary side will be:
A
230, 230, 115
B
230, 115, 115
C
345, 115, 115
D
345, 0, 345
4
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
An induction motor is fed from a balanced three phase supply at rated voltage and frequency through a bank of three single phase transformers connected in delta-delta. One unit of the bank develops fault and is removed. Then
A
single phasing will occur and the machine fails to start
B
single phasing will not occur but the motor terminal voltages will become unbalanced and the machine can be loaded to the extent of 57.7% of its rating.
C
the machine can be loaded to the extent of 57.7% of its rating with balanced supply at its terminals.
D
the machine can be loaded to the extent of $$66\frac23\%$$ with balanced supply at its terminals.
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