1
GATE EE 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
Assuming an ideal transformer, The Thevenin's equivalent voltage and impedance as seen from the terminals x and y for the circuit in figure are GATE EE 2014 Set 2 Electrical Machines - Transformers Question 80 English
A
2sin(wt), 4 Ω
B
1sin(wt), 1 Ω
C
1sin(wt), 2 Ω
D
2sin(wt), 0.5 Ω
2
GATE EE 2014 Set 2
Numerical
+1
-0
A single phase, 50 kVA, 1000 V/100 V two winding transformer is connected as an autotransformer as shown in the figure. GATE EE 2014 Set 2 Electrical Machines - Transformers Question 79 English The kVA rating of the autotransformer is _________.
Your input ____
3
GATE EE 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
In a constant V/f control of induction motor, the ratio V/f is maintained constant from 0 to base frequency, where V is the voltage applied to the motor at fundamental frequency f. Which of the following statements relating to low frequency operation of the motor is TRUE?
A
At low frequency, the stator flux increases from its rated value.
B
At low frequency, the stator flux decreases from its rated value.
C
At low frequency, the motor saturates.
D
At low frequency, the stator flux remains unchanged at its rated value.
4
GATE EE 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
A three-phase, 4-pole, self excited induction generator is feeding power to a load at a frequency $$f_1$$. If the load is partially removed, the frequency becomes $$f_2$$. If the speed of the generator is maintained at 1500 rpm in both the cases, then
A
$$f_1,f_2$$ > 50Hz and $$f_1$$ > $$f_2$$
B
$$f_1$$ < 50Hz and $$f_2$$ > 50Hz
C
$$f_1,f_2$$ < 50Hz and $$f_2$$ > $$f_1$$
D
$$f_1$$ > 50Hz and $$f_2$$ < 50Hz
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