7000+ GATE Entrance Exam Study Materials 2024 - 2025 Pdf - 1

Question: 1

The desirable properties of transformer core material are

(A) High permeability and high hysteresis loss

(B) Low permeability and low hysteresis loss

(C) High permeability and low hysteresis loss

(D) Low permeability and high hysteresis loss

Question: 2

The transformer efficiency at relatively light loads is quite low. This is due to

(A) Poor power factor

(B) High fixed loss in comparison to the output

(C) Small copper losses

(D) Small secondary output

Question: 3

In the transformer circuit mode, the core loss is represented as a

(A) Shunt resistance

(B) Shunt inductance

(C) Series resistance

(D) Series inductance

Question: 4

Open circuit test in a transformer is performed with

(A) High frequency supply

(B) Direct current

(C) Rated transformer current

(D) Rated transformer voltage

Question: 5

Which of the following dc motors has got maximum self relieving property?

(A) Series

(B) Shunt

(C) Cumulative compound

(D) Differential compound