1
GATE EE 2022
Numerical
+2
-0
A 3-phase, 415 V, 50 Hz induction motor draws 5 times the rated current at rated voltage at starting. It is required to bring down the starting current from the supply to 2 times of the rated current using a 3-phase autotransformer. If the magnetizing impedance of the induction motor and no load current of the autotransformer is neglected, then the transformation ratio of the autotransformer is given by ________. (round off to two decimal places).
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2
GATE EE 2018
Numerical
+2
-0
The equivalent circuit of a single phase induction motor is shown in the figure, where the
parameters are
R1 = R2' = Xl1 = Xl2' = 12 $$\Omega $$, Xm = 240 $$\Omega $$
and s is the slip. At no-load, the motor speed can be approximated to be the synchronous speed. The no-load lagging power factor of the motor is___________ (up to 3 decimal places).
R1 = R2' = Xl1 = Xl2' = 12 $$\Omega $$, Xm = 240 $$\Omega $$
and s is the slip. At no-load, the motor speed can be approximated to be the synchronous speed. The no-load lagging power factor of the motor is___________ (up to 3 decimal places).
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3
GATE EE 2017 Set 2
Numerical
+2
-0
A star-connected, 12.5 kW, 208 V (line), 3-phase, 60 Hz squirrel cage induction motor has
following equivalent circuit parameters per phase referred to the stator.
R1 = 0.3 Ω, R2 = 0.3 Ω, X1 = 0.41 Ω, X2 = 0.41 Ω. Neglect shunt branch in the equivalent circuit.
The starting current (in Ampere) for this motor when connected to an 80 V (line), 20 Hz, 3-
phase AC source is __________.
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4
GATE EE 2017 Set 1
Numerical
+2
-0
A 375W, 230 V, 50 Hz capacitor start single-phase induction motor has the following constants
for the main and auxiliary windings (at starting): $$Z_m=\left(12.50\;+\;j15.75\right)\;\Omega$$ (main winding),
$$Z_a=\left(24.50\;+\;j12.75\right)\;\Omega$$(auxiliary winding). Neglecting the magnetizing branch the value of the
capacitance (in µF ) to be added in series with the auxiliary winding to obtain maximum torque
at starting is _______.
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Questions Asked from Induction Machines (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE EE 2025 (1)
GATE EE 2024 (1)
GATE EE 2023 (1)
GATE EE 2022 (2)
GATE EE 2018 (1)
GATE EE 2017 Set 2 (1)
GATE EE 2017 Set 1 (1)
GATE EE 2015 Set 1 (1)
GATE EE 2015 Set 2 (1)
GATE EE 2014 Set 2 (1)
GATE EE 2014 Set 1 (1)
GATE EE 2013 (1)
GATE EE 2012 (1)
GATE EE 2011 (1)
GATE EE 2009 (1)
GATE EE 2008 (5)
GATE EE 2007 (4)
GATE EE 2006 (3)
GATE EE 2005 (4)
GATE EE 2004 (3)
GATE EE 2003 (4)
GATE EE 2000 (3)
GATE EE Subjects
Electric Circuits
Electromagnetic Fields
Signals and Systems
Electrical Machines
Engineering Mathematics
General Aptitude
Power System Analysis
Electrical and Electronics Measurement
Analog Electronics
Control Systems
Power Electronics