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GATE EE 2018 EXAM:Electrical Machines Quiz 3
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Question 1
In an auto-transformer, power is transferred, through
Question 2
Neglecting losses, if the power transformed inductively is equal to power transformed conductively in an auto-transformer, then the secondary to primary ratio of transformer is
Question 3
What is the power transmitted inductively in an auto-transformer which supplies a load at 161 volts with an applied primary voltage of 230 volts?
Question 4
It is advisable to use auto-transformer if the transformation ratio is
Question 5
A two-winding transformer is converted into an auto-transformer. If we apply additive polarity and subtractive polarity for the connections, then the secondary voltage is 2640 V and 2160 V, respectively. What is the ratio of primary to secondary voltage of the original transformer?
Question 6
What is the power transferred conductively from primary to secondary of an auto-transformer having trans-formation ratio of 0.8 supplying a load of 3 kW?
Question 7
A starting torque of 80 Nm is developed in an induction motor by an auto-transformer starter with a tapping of 30%. If the tapping of auto-transformer starter is 60%, then what is the starting torque?
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Jul 5ESE & GATE EE
