1
GATE EE 2026
MCQ (Single Correct Answer)
+1
-0

Which one of the following options is correct regarding the typical double-squirrel-cage structure used in induction motors?

A

At starting, a larger portion of the rotor current flows in the outer cage

B

At starting, a larger portion of the rotor current flows in the inner cage

C

At rated speed, most of the rotor current flows in the outer cage

D

The purpose of the double-squirrel-cage structure is to lower the effective rotor resistance at starting

2
GATE EE 2026
MCQ (Single Correct Answer)
+1
-0

The figure shows the single-line diagram of a synchronous generator delivering $\mathrm{P}=50 \mathrm{MW}$ of power at unity power factor to an infinite bus.

GATE EE 2026 Electrical Machines - Synchronous Machines Question 2 English

$I_s$ denotes the stator current phasor. If the field excitation is increased, which one of the following options correctly describes its effect on the stator current, power factor, and load angle of the machine?

A

Stator current increases, power factor becomes lagging, load angle remains the same

B

Stator current decreases, power factor becomes leading, load angle remains the same

C

Stator current increases, power factor becomes lagging, load angle decreases

D

Stator current increases, power factor becomes leading, load angle increases

3
GATE EE 2026
MCQ (Single Correct Answer)
+1
-0

A $220 \mathrm{~V} / 12 \mathrm{~V}$ single-phase transformer is designed for use in India and rated 100 VA at 50 Hz . Later, this unit is shipped to the USA where it is used as a $110 \mathrm{~V} / 6 \mathrm{~V}$ transformer at 60 Hz . Which of the following statements is/are correct?

A

No-load current drawn would be smaller for operation in the USA compared to that in India

B

For the same load current, the losses would be higher in the USA compared to that in India

C

The peak magnetic flux density in the core would be higher while operating in the USA compared to that in India

D

The eddy current losses in the core would be approximately $44 \%$ higher while operating in the USA compared to that in India

4
GATE EE 2026
MCQ (Single Correct Answer)
+2
-0

Three single-phase $11 \mathrm{kV} / 3.3 \mathrm{kV}$ transformers are connected to form a three-phase transformer bank with connections as shown.

GATE EE 2026 Electrical Machines - Transformers Question 2 English

Considering ABC phase sequence, the vector group of the transformer is:

A

DdO

B

Dd 4

C

Dd 6

D

Dd10