GATE EE

Dc Machines

Electrical Machines

(Past Years Questions)

Marks 1

More
A separately excited dc motor has an armature resistance R$$a$$ = 0.05⁡Ω. The field excitation is kept constant. At an a...
GATE EE 2018
A 4-pole, lap-connected, separately excited dc motor is drawing a steady current of 40 A while running at 600 rpm. A goo...
GATE EE 2016 Set 1
A 4-pole, separately excited, wave wound DC machine with negligible armature resistance is rated for 230 V and 5 kW at a...
GATE EE 2015 Set 2
A shunt-connected DC motor operates at its rated terminal voltage. Its no-load speed is 200 radian/second. At its rated ...
GATE EE 2015 Set 2
A separately excited DC generator has an armature resistance of 0.1 $$\Omega$$ and negligible armature inductance. At ra...
GATE EE 2015 Set 1
The no-load speed of a 230 V separately excited dc motor is 1400 rpm. The armature resistance drop and the brush drop ar...
GATE EE 2014 Set 3
A 4–point starter is used to start and control the speed of a
GATE EE 2011
The dc motor, which can provide zero speed regulation at full load without any controller is
GATE EE 2007
In a $$DC$$ machine, which of the following statements is true?
GATE EE 2006
A dc series motor fed from rated supply voltage is overloaded and its magnetic circuit is saturated. The torque-speed ch...
GATE EE 2002
In case of an armature controlled separately excited dc motor drive with closed loop speed control, an inner current loo...
GATE EE 2001
The compensating winding in a dc machine
GATE EE 2000
A 1.8° step, 4-phase stepper motor has a total of 40 teeth on 8 poles of stator. The number of rotor teeth for this moto...
GATE EE 2000
Ratio of the rotor reactance X to the rotor resistance R for a two-phase servomotor
GATE EE 2000
A 4-pole lap-wound DC generator has a developed power of P watts and voltage of E volts. Two adjacent brushes of the mac...
GATE EE 1999
The torque speed characteristic of a Repulsion motor resembles which of the following dc motor characteristic?
GATE EE 1996
Which type of motor is most suitable for computer printer device?
GATE EE 1996
A $$4$$ pole dynamo with wave wound armature has $$51$$ slots containing $$20$$ conductors in each slot. The induced $$e...
GATE EE 1996
A differentially compounded d.c. motor with interpoles and with brushes on the neutral axis is to be driven as a generat...
GATE EE 1995
A cumulative compounded long shunt motor is driving a load at rated torque and rated speed. If the series field is shunt...
GATE EE 1993
Neglecting all losses, the developed torque $$(T)$$ of $$d.c.$$ separately excited motor, operating under constant termi...
GATE EE 1992

Marks 2

More
A 200 V DC series motor, when operating from rated voltage while driving a certain load, draws 10 A current and runs at ...
GATE EE 2018
A 220 V, 10 kW, 900 rpm separately excited DC motor has an armature resistance Ra= 0.02 Ω. When the motor operates at ra...
GATE EE 2017 Set 2
A 120 V DC shunt motor takes 2 A at no load. It takes 7 A on full load while running at 1200 rpm. The armature resistanc...
GATE EE 2017 Set 2
A 220 V DC series motor runs drawing a current of 30 A from the supply. Armature and field circuit resistances are 0.4 Ω...
GATE EE 2017 Set 1
A separately excited DC generator supplies 150 A to a 145 V DC grid. The generator is running at 800 RPM. The armature r...
GATE EE 2017 Set 1
A DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field resistance are 0.01 ...
GATE EE 2016 Set 1
With an armature voltage of 100 V and rated field winding voltage, the speed of a separately excited DC motor driving a ...
GATE EE 2015 Set 2
A separately excited DC motor runs at 1000 rpm on no load when its armature terminals are connected to a 200 V DC source...
GATE EE 2015 Set 1
A DC motor has the following specifications: 10 Hp, 37.5 A, 230 V; flux/pole = 0.01 Wb, number of poles = 4, number of c...
GATE EE 2015 Set 1
A separately excited 300 V DC shunt motor under no load runs at 900 rpm drawing an armature current of 2 A. The armature...
GATE EE 2014 Set 3
A 250 V dc shunt machine has armature circuit resistance of 0.6 $$\Omega$$ and field circuit resistance of 125 $$\Omega$...
GATE EE 2014 Set 2
A 15kW, 230V dc shunt motor has armature circuit resistance of 0.4 $$\Omega$$ and field circuit resistance of 230 $$\Ome...
GATE EE 2014 Set 1
A 220 V, 15 kW, 1000 rpm shunt motor with armature resistance of 0.25 Ω , has a rated line current of 68 A and a rated ...
GATE EE 2012
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 $$\Omega$$ and armature curr...
GATE EE 2011
A separately excited DC motor runs at 1500 rpm under no-load with 200 V applied to the armature. The field voltage is ma...
GATE EE 2010
A separately excited DC motor runs at 1500 rpm under no-load with 200 V applied to the armature. The field voltage is ma...
GATE EE 2010
Figure shows the extended view of a $$2$$ pole $$dc$$ machine with $$10$$ armature conductors. Normal brush positions a...
GATE EE 2009
A $$240V$$ $$dc$$ shunt motor draws $$15A$$ while supplying the rated load at a speed of $$80$$ $$rad/s$$. The armatur...
GATE EE 2008
A $$240V$$ $$dc$$ shunt motor draws $$15A$$ while supplying the rated load at a speed of $$80$$ $$rad/s$$. The armatur...
GATE EE 2008
A $$220V$$ $$DC$$ machine supplies $$20$$ $$A$$ at $$200V$$ as a generator. The armature resistance is $$0.2$$ ohm. If t...
GATE EE 2006
Two magnetic poles revolve around a stationary armature carrying two coils ($$c_1-c'_1$$ , $$c_2-c'_2$$ ) as shown in Fi...
GATE EE 2005
A 50 kW dc shunt motor is loaded to draw rated armature current at any given speed. When driven (i) at half the rated sp...
GATE EE 2005
In relation to DC machines, match the following and choose the correct combination. Group-I(Performance variables) (P) A...
GATE EE 2005
The armature resistance of a permanent magnet dc motor is 0.8 $$\Omega$$. At no load, the motor draws 1.5 A from a suppl...
GATE EE 2004
A 8 pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 ...
GATE EE 2004
A dc series motor driving an electric train faces a constant power load. It is running at rated speed and rated voltage....
GATE EE 2003
A 200 V, 2000 rpm, 10A, separately excited d.c. motor has an armature resistance of 2 $$\Omega$$. Rated d.c. voltage is ...
GATE EE 2002
An electric motor with 'constant output power' will have a torque speed characteristic in the form of a
GATE EE 2001
A 240 V dc series motor takes 40A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of res...
GATE EE 2000
A permanent magnet dc commutator motor has a no load speed of 6000 rpm when connected to a 120V dc supply. The armature ...
GATE EE 2000
A DC shunt motor is running at 1200 rmp, when excited with 220 V DC. Neglecting the losses and saturation, the speed of ...
GATE EE 1999
A 240 V d.c. shunt motor with an armature resistance of 0.5 $$\Omega$$ has a full load current of 40 A. Find the ratio o...
GATE EE 1998
Match the following List-I (Test) (A) No load and blocked rotor test (B) Sumpner’s test (C) Swinburn’s test List-II (M...
GATE EE 1998

Marks 5

More
A $$230V,$$ $$250$$ $$rpm.$$ $$100A$$ separately excited $$dc$$ motor has an armature resistance of $$0.5\,\Omega .$$ Th...
GATE EE 2002
In a $$dc$$ motor running at $$2000$$ $$rpm,$$ the hysteresis and eddy current losses are $$500$$ $$W$$ and $$200$$ $$W$...
GATE EE 2001
A $$dc$$ series motor is rated $$230V,$$ $$1000$$ $$rpm,$$ $$80$$ $$A$$ (refer to Figure). The series field resistance i...
GATE EE 2001
A separately excited $$DC$$ shunt motor is driving a fan load whose torque is proportional to the square of the speed. W...
GATE EE 1999
A $$DC$$ shunt generator delivers $$60$$ $$KW$$ at $$240$$ $$V$$ and $$360$$ $$rpm.$$ The armature and field resistances...
GATE EE 1998
A $$5$$ $$kW,$$ $$200V$$ $$d.c.$$ shunt motor has an armature resistance of $$1$$ $$ohm$$ and shunt field resistance of ...
GATE EE 1997
A $$200V$$, $$10$$ $$kW$$ lap-wound $$d.c.$$ generator has $$10$$ poles and $$500$$ conductors on it's armature. If th...
GATE EE 1997
The field coil of a two-pole $$d.c.$$ series motor is made up of two identical sections In one case $$(i)$$ of two secti...
GATE EE 1997
At $$50\% $$ of full load, the armature current drawn by a $$d.c.$$ shunt motor is $$40$$ A when connected to a $$200$$ ...
GATE EE 1997
A separately excited $$d.c.$$ motor has an armature resistance of $$0.5$$ $$ohm.$$ It runs off a $$250$$ $$V$$ $$d.c.$$ ...
GATE EE 1992

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