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Previous year question hub

DC Machines - Electrical Machines - Electrical Engineering Previous Year Questions

Practice DC Machines - Electrical Machines - Electrical Engineering previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

21Papers
17Years
33Questions
1Topics

DC Machines question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for DC Machines. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Medium 28 84.8%
Easy 3 9.1%
Hard 2 6.1%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 19 57.6%
Numerical Answer Type (NAT) 14 42.4%

Subject weightage

Top subjects by unique question coverage.

Electrical Engineering
33 Qs

Most asked topics

Top topics across the included previous year papers.

Electrical Machines
33 Qs

Subtopic coverage

Top subtopics inside this exact selection.

DC Machines
33 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Electrical Engineering (EE) 2024
1 Qs
Electrical Engineering (EE) 2023
2 Qs
Electrical Engineering (EE) 2022
1 Qs
Electrical Engineering (EE) 2021
1 Qs
Electrical Engineering (EE) 2020
1 Qs
Electrical Engineering (EE) 2019
1 Qs
Electrical Engineering (EE) 2018
2 Qs
Electrical Engineering (EE) 2017 [Session 1]
2 Qs
Electrical Engineering (EE) 2017 [Session 2]
2 Qs
Electrical Engineering (EE) 2016 [Session 1]
2 Qs
Electrical Engineering (EE) 2016 [Session 2]
1 Qs
Electrical Engineering (EE) 2014 [Session 1]
1 Qs
Electrical Engineering (EE) 2014 [Session 2]
1 Qs
Electrical Engineering (EE) 2014 [Session 3]
1 Qs
Electrical Engineering (EE) 2013 [Session 3]
1 Qs
Electrical Engineering (EE) 2012
1 Qs
Electrical Engineering (EE) 2011
2 Qs
Electrical Engineering (EE) 2010
3 Qs
Electrical Engineering (EE) 2009
1 Qs
Electrical Engineering (EE) 2008
4 Qs
Electrical Engineering (EE) 2007
2 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
Electrical Engineering (EE) 202420241View paper
Electrical Engineering (EE) 202320232View paper
Electrical Engineering (EE) 202220221View paper
Electrical Engineering (EE) 202120211View paper
Electrical Engineering (EE) 202020201View paper
Electrical Engineering (EE) 201920191View paper
Electrical Engineering (EE) 201820182View paper
Electrical Engineering (EE) 2017 [Session 1]20172View paper
Electrical Engineering (EE) 2017 [Session 2]20172View paper
Electrical Engineering (EE) 2016 [Session 1]20162View paper
Electrical Engineering (EE) 2016 [Session 2]20161View paper
Electrical Engineering (EE) 2014 [Session 1]20141View paper
Electrical Engineering (EE) 2014 [Session 2]20141View paper
Electrical Engineering (EE) 2014 [Session 3]20141View paper
Electrical Engineering (EE) 2013 [Session 3]20131View paper
Electrical Engineering (EE) 201220121View paper
Electrical Engineering (EE) 201120112View paper
Electrical Engineering (EE) 201020103View paper
Electrical Engineering (EE) 200920091View paper
Electrical Engineering (EE) 200820084View paper
Electrical Engineering (EE) 200720072View paper

All DC Machines previous year questions

Practice every matching question in batches of 20, with every available option.

1
2007 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2007

The dc motor, which can provide zero speed regulation at full load without any controller, is

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2
2007 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2007
The electromagnetic torque \(T_e\) of a drive, and its connected load torque \(T_L\) are as shown below. Out of the operating points A, B, C and D, the stable ones are
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3
2008 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2008

In a stepper motor, the detent torque means

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4
2008 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2008
Neglecting all losses of both the machines, the dc generator power output and the current through resistance (Rext) will respectively be
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5
2008 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2008
The net voltage across the armature resistance at the time of plugging will be
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6
2008 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2008

The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

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7
2009 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2009
Figure shows the extended view of a 2 pole dc machine with 10 armature conductors. Normal brush positions are shown by A and B, placed at the interpolar axis. If the brushes are now shifted, in the direction of rotation, to A' and B' as shown, the voltage waveform VA'B' will resemble
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8
2010 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2010
A separately excited dc machine is coupled to a 50 Hz, three-phase, 4-pole induction machine as shown in the figure. The dc machine is energized first and the machines rotate at 1600 rpm. Subsequently the induction machine is also connected to a 50 Hz, three-phase source. the phase sequence being consistent with the direction of rotation. In steady state,
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9
2010 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (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 maintained at its rated value. The speed of the motor, when it delivers a torque of 5 Nm, is 1400 rpm as shown in the figure. The rotational losses and armature reaction are neglected. The armature resistance of the motor is.

Question diagram

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10
2010 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2010
For the motor to deliver a torque of 2.5 Nm at 1400 rpm, the armature voltage to be applied is
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11
2011 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2011

A 4-point starter is used to start and control the speed of a

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12
2011 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2011
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. If the excitation of the machine is reduced by 10 %, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be
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13
2012 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2012

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 field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

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14
2013 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2013 [Session 3]
The separately excited dc motor in the figure below has a rated armature current of 20 A and a rated armature voltage of 150 V. An ideal chopper switching at 5 kHz is used to control the armature voltage. If \(L_a=0.1\) mH, \(R_a=1\ \Omega\), neglecting armature reaction, the duty ratio of the chopper to obtain 50% of the rated torque at the rated speed and the rated field current is

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15
2014 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2014 [Session 1]
A 15 kW, 230 V dc shunt motor has armature circuit resistance of 0.4 Ω and field circuit resistance of 230 Ω. At no load and rated voltage, the motor runs at 1400 rpm and the line current drawn by the motor is 5 A. At full load, the motor draws a line current of 70 A. Neglect armature reaction. The full load speed of the motor in rpm is ______.
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16
2014 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2014 [Session 2]
A 250 V dc shunt machine has armature circuit resistance of 0.6 \(\Omega\) and field circuit resistance of 125 \(\Omega\). The machine is connected to 250 V supply mains. The motor is operated as a generator and then as a motor separately. The line current of the machine in both the cases is 50 A. The ratio of the speed as a generator to the speed as a motor is ________.
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17
2014 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2014 [Session 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 motor torque at points P, Q, R and S

The stable operating points are

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18
2016 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2016 [Session 1]
A 4-pole, lap-connected, separately excited dc motor is drawing a steady current of 40 A while running at 600 rpm. A good approximation for the waveshape of the current in an armature conductor of the motor is given by
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19
2016 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2016 [Session 1]
A DC shunt generator delivers 45 A at a terminal voltage of 220 V. The armature and the shunt field resistances are 0.01 Ω and 44 Ω respectively. The stray losses are 375 W. The percentage efficiency of the DC generator is ________.
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20
2016 · Electrical Engineering · Electrical Machines · DC Machines
Electrical Engineering (EE) 2016 [Session 2]
A rotating conductor of 1 m length is placed in a radially outward (about the z-axis) magnetic flux density (B) of 1 Tesla as shown in figure below. Conductor is parallel to and at 1 m distance from the z-axis. The speed of the conductor in r.p.m. required to induce a voltage of 1 V across it, should be __________.

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Showing 20 of 33 questions