The thickness of laminations used in a transformer is usually____________?
The thickness of laminations used in a transformer is usually____________?
A. 0.4 mm to 0.5 mm
B. 4 mm to 5 mm
C. 14 mm to 15 mm
D. 25 mm to 40 mm
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The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
A. avoids core saturation and high voltage induction
B. is safe to human beings
C. protects the primary circuit
D. none of the aboveDelta/star transformer works satisfactorily when______________?
Delta/star transformer works satisfactorily when______________?
A. load is balanced only
B. load is unbalanced only
C. on balanced as well as unbalanced loads
D. none of the aboveThe secondary winding of which of the following transformers is always kept closed?
The secondary winding of which of the following transformers is always kept closed?
A. Step-up transformer
B. Step-down transformer
C. Potential transformer
D. Current transformerNegative voltage regulation is indicative that the load is___________?
Negative voltage regulation is indicative that the load is___________?
A. capacitive only
B. inductive only
C. inductive or resistive
D. none of the aboveIn a transformer the energy is conveyed from primary to secondary_________?
In a transformer the energy is conveyed from primary to secondary_________?
A. through cooling coil
B. through air
C. by the flux
D. none of the aboveWhich type of winding is used in 3 phase shell-type transformer?
Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular type