1
GATE EE 2024
MCQ (Single Correct Answer)
+2
-1.33

A 3-phase, 11 kV, 10 MVA synchronous generator is connected to an inductive load of power factor $(\sqrt{3}/2)$ via a lossless line with a per-phase inductive reactance of 5 $\Omega$. The per-phase synchronous reactance of the generator is 30 $\Omega$ with negligible armature resistance. If the generator is producing the rated current at the rated voltage, then the power factor at the terminal of the generator is

A

0.63 lagging.

B

0.87 lagging.

C

0.63 leading.

D

0.87 leading.

2
GATE EE 2024
MCQ (More than One Correct Answer)
+2
-1.33

Which of the following options is/are correct for the Automatic Generation Control (AGC) and Automatic Voltage Regulator (AVR) installed with synchronous generators?

A

AGC response has a local effect on frequency while AVR response has a global effect on voltage.

B

AGC response has a global effect on frequency while AVR response has a local effect on voltage.

C

AGC regulates the field current of the synchronous generator while AVR regulates the generator’s mechanical power input.

D

AGC regulates the generator’s mechanical power input while AVR regulates the field current of the synchronous generator.

3
GATE EE 2024
Numerical
+2
-1.33

A 3-phase star connected slip ring induction motor has the following parameters referred to the stator:

$R_s = 3\, \Omega,\; X_s = 2\, \Omega,\; X_r' = 2\, \Omega,\; R_r' = 2.5\, \Omega$

The per phase stator to rotor effective turns ratio is 3:1. The rotor winding is also star connected. The magnetizing reactance and core loss of the motor can be neglected. To have maximum torque at starting, the value of the extra resistance in ohms (referred to the rotor side) to be connected in series with each phase of the rotor winding is _______ (rounded off to 2 decimal places).

Your input ____
4
GATE EE 2024
Numerical
+2
-1.33

A 5 kW, 220 V DC shunt motor has 0.5 $\Omega$ armature resistance including brushes. The motor draws a no-load current of 3 A. The field current is constant at 1 A. Assuming that the core and rotational losses are constant and independent of the load, the current (in amperes) drawn by the motor while delivering the rated load, for the best possible efficiency, is _______ (rounded off to 2 decimal places).

Your input ____
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