1
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
When Stator and Rotor windings of a 2-pole rotating electrical machine are
excited, each would produce a sinusoidal mmf distribution in the air gap with
peak values Fs and Fr respectively. The rotor mmf lags stator mmf by a space
angle $$\delta\;$$ at any instant as shown in Fig. Thus, half of stator and rotor surfaces
will form one pole with the other half forming the second pole. Further, the
direction of torque acting on the rotor can be clockwise or counter-clockwise.
The following Table gives four sets of statements as regards poles and torque.
Select the correct set corresponding to the mmf axes as shown in Figure.
2
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A three phase, wound rotor induction motor is to be operated with slip energy
recovery in the constant torque mode, when it delivers an output power P0 at slop
's'. then theoretically, the maximum power that is available for recovery at the
rotor terminals, is equal to
3
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
The power input to a 415 V, 50 Hz, 6 pole, 3-phase induction motor running at
975 rpm is 40 kW. The stator losses are 1kW and friction and windage losses
total 2 kW. The efficiency of the motor is
4
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A 3-phase, 4-pole squirrel cage induction motor has 36 stator and 28 rotor slots.
The number of phases in the rotor is:
Questions Asked from Induction Machines (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE EE 2018 (1)
GATE EE 2017 Set 2 (1)
GATE EE 2017 Set 1 (1)
GATE EE 2015 Set 2 (1)
GATE EE 2015 Set 1 (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