Induction Machines · Electrical Machines · GATE EE

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Marks 1

GATE EE 2022
The frequencies of the stator and rotor currents flowing in the three-phase 8-pole induction motor are 40 Hz and 1 Hz, respectively. The motor speed, ...
GATE EE 2022
A 4-pole induction motor with inertia of 0.1 kg-m2 drives a constant load torque of 2 Nm. The speed of the motor is increased linearly from 1000 rpm t...
GATE EE 2022
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 curren...
GATE EE 2017 Set 2
A 3-phase, 4-pole, 400 V, 50 Hz squirrel-cage induction motor is operating at a slip of 0.02. The speed of the rotor flux in mechanical rad/sec, sense...
GATE EE 2017 Set 1
A 4 pole induction machine is working as an induction generator. The generator supply frequency is 60 Hz. The rotor current frequency is 5 Hz. The mec...
GATE EE 2016 Set 2
The direction of rotation of a single-phase capacitor run induction motor is reversed by
GATE EE 2016 Set 1
In a constant V/f induction motor drive, the slip at the maximum torque
GATE EE 2015 Set 2
The figure shows the per-phase equivalent circuit of a two-pole three-phase induction motor operating at 50 Hz. The 'air-gap' voltage, Vg across the m...
GATE EE 2014 Set 3
A single phase induction motor is provided with capacitor and centrifugal switch in series with auxiliary winding. The switch is expected to operate a...
GATE EE 2014 Set 3
The torque-speed characteristics of motor ($$T_M$$) and load ($$T_L$$) for two cases are shown in the figures (a) and (b). The load torque is equal to...
GATE EE 2014 Set 2
A three-phase, 4-pole, self excited induction generator is feeding power to a load at a frequency $$f_1$$. If the load is partially removed, the frequ...
GATE EE 2014 Set 2
In a constant V/f control of induction motor, the ratio V/f is maintained constant from 0 to base frequency, where V is the voltage applied to the mot...
GATE EE 2014 Set 1
An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 700 rpm. The frequency of the rotor current of the motor in Hz is ________.
GATE EE 2013
Leakage flux in an induction motor is
GATE EE 2012
The slip of an induction motor normally does not depend on
GATE EE 2010
A balanced three-phase voltage is applied to a star-connected induction motor, the phase to neutral voltage being V. The stator resistance, rotor resi...
GATE EE 2005
For an induction motor, operating at a slip 's', the ratio of gross power output to air gap power is equal to:
GATE EE 2005
On the torque/speed curve of induction motor shown in Fig, four points of operation are market as W, X, Y and Z. Which one of them represents the oper...
GATE EE 2004
The type of single-phase induction motor having the highest power factor at full load is
GATE EE 2004
The direction of rotation of a 3-phase induction motor is clockwise when it is supplied with 3-phase sinusoidal voltage having phase sequence A-B-C. F...
GATE EE 2004
For a linear electromagnetic circuit, the following statement is true.
GATE EE 2003
Group I lists different applications and Group II lists the motors for these applications. Match the application with the most suitable motor and choo...
GATE EE 2003
No-load test on a 3-phase induction motor was conducted at different supply voltages and a plot of input power versus voltage was drawn. This curve wa...
GATE EE 2002
If a 400 V, 50 Hz, star connected, 3 phase squirrel cage induction motor is operated from a 400 V, 75 Hz supply, the torque that the motor can now pro...
GATE EE 1999
Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting
GATE EE 1999
The following starting method for an induction motor is inferior view of the poor starting torque per ampere of the line current drawn:
GATE EE 1998
A 3-phase squirrel cage induction motor has a full load efficiency of 0.8 and a maximum efficiency of 0.9. It is operated at a slip of 0.6 by applying...
GATE EE 1997
If an induction machine is run at above synchronous speed, it acts as
GATE EE 1996
Unbalanced supply voltage given to a $$3-$$ phase, data-connected induction motor will cause
GATE EE 1996
When the supply voltage to an induction motor is reduced by $$10\% $$, the maximum torque will decrease by approximately
GATE EE 1996
In case of a split phase motor, the phase shift between currents in the two windings is around
GATE EE 1996
An induction motor having full load torque of $$60$$ $$Nm$$ when delta-connected develops a starting torque of $$120$$ $$N$$-$$m.$$ For the same simpl...
GATE EE 1996
In an induction motor, if the air gap is increased
GATE EE 1995
An induction motor is fed from a balanced three phase supply at rated voltage and frequency through a bank of three single phase transformers connecte...
GATE EE 1994
Skew is used in induction motors in order to reduce torque due to
GATE EE 1993
A three phase slip ring induction motor is fed from the rotor side with stator winding short circuited. The frequency of the currents flowing in the s...

Marks 2

GATE EE 2018
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 =...
GATE EE 2017 Set 2
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 t...
GATE EE 2017 Set 1
A 375W, 230 V, 50 Hz capacitor start single-phase induction motor has the following constants for the main and auxiliary windings (at starting): $$Z_m...
GATE EE 2015 Set 2
A 220 V, 3-phase, 4-pole, 50 Hz inductor motor of wound rotor type is supplied at rated voltage and frequency. The stator resistance, magnetizing reac...
GATE EE 2015 Set 1
A 3-phase 50 Hz square wave (6-step) VSI feeds a 3-phase, 4 pole induction motor. The VSI line voltage has a dominant 5th harmonic component. If the o...
GATE EE 2014 Set 2
A three-phase slip-ring induction motor, provided with a commutator winding, is shown in the figure. The motor rotates in clockwise direction when the...
GATE EE 2014 Set 1
A 3 phase, 50 Hz, 6 pole induction motor has a rotor resistance of 0.1 Ω and reactance of 0.92 Ω. Neglect the voltage drop in stator and assume that t...
GATE EE 2013
A 4-pole induction motor, supplied by a slightly unbalanced three-phase 50Hz source, is rotating at 1440 rpm. The electrical frequency in Hz of the in...
GATE EE 2012
The locked rotor current in a 3-phase, star connected 15 kW, 4-pole, 230 V, 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and m...
GATE EE 2011
A three-phase 440V, 6 pole, 50Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field to rotor magnetic field...
GATE EE 2009
A $$200$$ $$V,$$ $$50$$ $$Hz,$$ single-phase induction motor has the following connection diagram and winding orientations shown. $$MM'$$ is the axis ...
GATE EE 2008
A $$230V,$$ $$50Hz,$$ $$4$$ pole, single phase induction motor is rotating in the clockwise (forward) direction at a speed of $$1425$$ $$rpm.$$ If the...
GATE EE 2008
A $$400$$ $$V,$$ $$50$$ $$Hz$$, $$4$$ pole, $$1400$$ $$rpm$$, star connected squirrel cage induction motor has the following parameters referred to t...
GATE EE 2008
A $$400$$ $$V,$$ $$50$$ $$Hz,$$ $$30$$ $$hp,$$ three-phase induction motor is drawing $$50$$ A current at $$0.8$$ power factor lagging. The stator and...
GATE EE 2008
A $$3$$-phase, $$440$$ $$V,$$ $$50$$ $$Hz,$$ $$4$$ pole, slip ring induction motor is feed from the rotor side through an auto transformer and the st...
GATE EE 2008
A $$3$$-phase, $$440$$ $$V,$$ $$50$$ $$Hz,$$ $$4$$ pole, slip ring induction motor is feed from the rotor side through an auto transformer and the st...
GATE EE 2007
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$ If an auto-tra...
GATE EE 2007
A three-phase squirrel cage induction motor has a starting torque of $$150\% $$ and a maximum torque of $$300\% $$ with respect to rated torque at rat...
GATE EE 2007
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$ If a star-delt...
GATE EE 2007
A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of $$5\% $$ If a starting ...
GATE EE 2006
A $$3$$ phase, $$4$$ pole, $$400$$ $$V,$$ $$50$$ $$Hz,$$ star connected induction motor has following circuit parameters $${r_1} = 1.0\Omega ,\,{r_2} ...
GATE EE 2006
The speed of a $$4$$-pole induction motor is controlled by varying the supply frequency while maintaining the ratio of supply voltage to supply freque...
GATE EE 2006
A $$3$$ phase, $$10$$ $$kW$$, $$400$$ $$V,$$ $$4$$ pole, $$50$$ $$Hz$$, star connected induction motor draws $$20$$ A on full load. Its no load and bl...
GATE EE 2005
Under no load condition, if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,
GATE EE 2005
A three-phase cage induction motor is started by direct-on-line (DOL) switching at the rated voltage. If the starting current drawn is 6 times the ful...
GATE EE 2005
Assertion [a]: Under V/f control of induction motor, the maximum value of the developed torque remains constant over a wide range of speed in the subs...
GATE EE 2005
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve
GATE EE 2004
A single-phase, 230 V, 50 Hz, 4 pole, capacitor-start induction motor has the following stand still impedances Main winding Zm =6.0 + j4.0Ω Auxiliary ...
GATE EE 2004
A rotating electrical machine having its self-inductances of both the stator and the rotor windings, independent of the rotor position will be definit...
GATE EE 2004
A 400 V, 15 kW, 4 pole, 50 Hz, Y-connected induction motor has full load slip of 4%. The output torque of the machine at full load is
GATE EE 2003
Following are some of the properties of rotating electrical machines P. Stator winding current is dc, rotor-winding current is ac Q. Stator winding cu...
GATE EE 2003
A 3-phase Inductor Motor is driving a constant torque load at rated voltage and frequency. If both voltage and frequency are halved, following stateme...
GATE EE 2003
A single phase induction motor with only the main winding excited would exhibit the following response at synchronous speed
GATE EE 2003
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 wi...
GATE EE 2000
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 P...
GATE EE 2000
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 los...
GATE EE 2000
A 3-phase, 4-pole squirrel cage induction motor has 36 stator and 28 rotor slots. The number of phases in the rotor is:
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