Which of the following parts of a transformer is visible from outside?
Which of the following parts of a transformer is visible from outside?
The transformer ratings are usually expressed in terms of
The transformer ratings are usually expressed in terms of
The magnetising current of a transformer is usually small because it has
The magnetising current of a transformer is usually small because it has
Which of the following insulating materials can withstand the highest temperatur
Which of the following insulating materials can withstand the highest temperature safely?
In case of 3-phase induction motors, plugging means
In case of 3-phase induction motors, plugging means
The main reason for generation of harmonics in a transformer could be
The main reason for generation of harmonics in a transformer could be
When secondary of a current transformer is open-circuited its iron core will be
When secondary of a current transformer is open-circuited its iron core will be
Spacers are provided between adjacent coils
Spacers are provided between adjacent coils
A shell-type transformer has
A shell-type transformer has
In N s is the synchronous speed and s the slip, then actual running speed of an
In N s is the synchronous speed and s the slip, then actual running speed of an induction motor will be
Distribution transformers are generally designed for maximum efficiency around
Distribution transformers are generally designed for maximum efficiency around
Power transformers are generally designed to have maximum efficiency around
Power transformers are generally designed to have maximum efficiency around