Electrical Machines
Transformers
Auto Transformer
Questions mapped to Auto Transformer under Transformers.
11
Total0
Attempted0
Correct0
IncorrectA , single-phase two-winding transformer is configured as a autotransformer.
What will be the rating of the autotransformer?
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockA single-phase, 22KVA, 2200V/220V, 50Hz, distribution transformer is to be connected as an auto-transformer to get an output voltage of 2420V. Its maximum KVA rating as an auto-transformer is
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockA single-phase, 2kVA, 100/200 V transformer is reconnected as an auto-transformer such that its kVA rating is maximum. The new rating, in kVA, is ___________.
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockA 200/400V, 50 Hz, two-winding transformer is rated at 20 kVA. Its windings are connected as an auto-transformer of rating 200/600 V. A resistive load of 12 Ω is connected to the high voltage (600V) side of the auto-transformer. The value of equivalent load resistance (in Ohm) as seen from low voltage side is _____________.
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockA single phase, 50kVA, 1000V/100V two winding transformer is connected as an autotransformer as shown in the figure.
The kVA rating of the autotransformer is ________________.
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockThe figure below shows coils 1 and 2, with dot markings as shown, having 4000 and 6000 turns respectively. Both the coils have a rated current of 25 A. Coil 1 is excited with single phase, 400 V, 50 Hz supply.
The coils are to be connected to obtain a single phase, 400/1000 V, auto-transformer to drive a load of 10kVA. Which of the options given should be exercised to realize the required auto-transformer?
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockThe figure below shows coils 1 and 2, with dot markings as shown, having 4000 and 6000 turns respectively. Both the coils have a rated current of 25 A. Coil 1 is excited with single phase, 400 V, 50 Hz supply.
In the autotransformer obtained in Question 57, the current in each coil is
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockA 50 kVA, 3300/230V single-phase transformer is connected as an autotransformer shown in figure. The nominal rating of the autotransformer will be
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockA 400V/100V, 10 kVA two-winding transformer is reconnected as an auto-transformer across a suitable voltage source. The maximum rating of such an arrangement could be
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockAuto-transformer is used in transmission and distribution
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to UnlockWhen started by means of an auto-transformer with 50% tapping, supply current at start of an induction motor is reduced to ______________ of that when started by means of a star-delta starter.
Sign in to see the solution
Log in to view the explanation, track your attempts, and keep your progress.
Sign in to Unlock