1
GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+1
-0.3
The torque-speed characteristics of motor ($$T_M$$) and load ($$T_L$$) for two cases are shown in the figures (a) and (b). The load torque is equal to motor torque at points P, Q, R and S GATE EE 2014 Set 3 Electrical Machines - Induction Machines Question 54 EnglishThe stable operating points are
A
P and R
B
P and S
C
Q and R
D
Q and S
2
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
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 2013
MCQ (Single Correct Answer)
+1
-0.3
Leakage flux in an induction motor is
A
flux that leaks through the machine
B
flux that links both stator and rotor windings
C
flux that links none of the windings
D
flux that links the stator winding or the rotor winding but not both
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