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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as
35 ppm.
25 ppm.
45 ppm.
20 ppm.
35 ppm.
25 ppm.
45 ppm.
20 ppm.
Answer
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Related Question
Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?
+3%
+3.33%
-3.33%
-3%
+3%
+3.33%
-3.33%
-3%
Answer
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Electrical Machines
Flux density under leading pole tips in case of generator will
either increase or decrease
increase
None of these
decrease
either increase or decrease
increase
None of these
decrease
Answer
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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?
Both 1and 2
Terminal voltage is same
Frequency should be same
Speed of alternators should be same
Both 1and 2
Terminal voltage is same
Frequency should be same
Speed of alternators should be same
Answer
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Electrical Machines
Field weakening method is also called as-----------?
constant power control
constant voltage control
constant current control
constant torque control
constant power control
constant voltage control
constant current control
constant torque control
Answer
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Electrical Machines
A smaller air gap in a induction motor helps to
reduce the magnetizing current.
reduce the chance of crawling.
reduce the chance of cogging.
increase the starting torque.
reduce the magnetizing current.
reduce the chance of crawling.
reduce the chance of cogging.
increase the starting torque.
Answer
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