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Previous year question hub

Synchronous Machines - Electrical Machines - Electrical Engineering Previous Year Questions

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

20Papers
16Years
37Questions
1Topics

Synchronous Machines question pattern

Every graph below is calculated only from this selection.

Questions by year

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

Difficulty distribution

How the classified questions are distributed by difficulty.

Medium 28 75.7%
Easy 9 24.3%

Question type distribution

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

MCQ 22 59.5%
Numerical Answer Type (NAT) 14 37.8%
MSQ 1 2.7%

Subject weightage

Top subjects by unique question coverage.

Electrical Engineering
37 Qs

Most asked topics

Top topics across the included previous year papers.

Electrical Machines
37 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Synchronous Machines
37 Qs

Paper coverage

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

Electrical Engineering (EE) 2025
2 Qs
Electrical Engineering (EE) 2024
1 Qs
Electrical Engineering (EE) 2023
1 Qs
Electrical Engineering (EE) 2022
1 Qs
Electrical Engineering (EE) 2021
1 Qs
Electrical Engineering (EE) 2020
4 Qs
Electrical Engineering (EE) 2019
2 Qs
Electrical Engineering (EE) 2018
1 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]
2 Qs
Electrical Engineering (EE) 2014 [Session 1]
2 Qs
Electrical Engineering (EE) 2014 [Session 2]
2 Qs
Electrical Engineering (EE) 2014 [Session 3]
1 Qs
Electrical Engineering (EE) 2011
2 Qs
Electrical Engineering (EE) 2010
2 Qs
Electrical Engineering (EE) 2009
1 Qs
Electrical Engineering (EE) 2008
3 Qs
Electrical Engineering (EE) 2007
3 Qs

Included previous year papers

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

PaperYear / sessionQuestions in this viewOpen
Electrical Engineering (EE) 202520252View paper
Electrical Engineering (EE) 202420241View paper
Electrical Engineering (EE) 202320231View paper
Electrical Engineering (EE) 202220221View paper
Electrical Engineering (EE) 202120211View paper
Electrical Engineering (EE) 202020204View paper
Electrical Engineering (EE) 201920192View paper
Electrical Engineering (EE) 201820181View 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]20162View paper
Electrical Engineering (EE) 2014 [Session 1]20142View paper
Electrical Engineering (EE) 2014 [Session 2]20142View paper
Electrical Engineering (EE) 2014 [Session 3]20141View paper
Electrical Engineering (EE) 201120112View paper
Electrical Engineering (EE) 201020102View paper
Electrical Engineering (EE) 200920091View paper
Electrical Engineering (EE) 200820083View paper
Electrical Engineering (EE) 200720073View paper

All Synchronous Machines previous year questions

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

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

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor. If its shaft load is reduced by half, with field current held constant, its new power factor will be

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2
2007 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2007

A 100 kVA, 415 V (line), star-connected synchronous machine generates rated open circuit voltage of 415 V at a field current of 15 A. The short circuit armature current at a field current of 10 A is equal to the rated armature current. The per unit saturated synchronous reactance is

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3
2007 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2007

A three-phase, three-stack, variable reluctance step motor has 20 poles on each rotor and stator stack. The step angle of this step motor is

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4
2008 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2008

Distributed winding and short chording employed in AC machines will result in

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5
2008 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2008
The excitation voltage (E) and load angle (δ) will respectively be
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6
2008 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2008

Keeping the excitation voltage same, the load on the motor is increased such that the motor current increases by 20%. The operating power factor will become

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7
2009 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2009

A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a terminal voltage of 2000 V on open circuit. The magnitude of the internal voltage drop within the machine at a load current of 200 A is

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8
2010 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2010

Consider a stator winding of an alternator with an internal high-resistance ground fault. The currents under the fault condition are as shown in the figure. The winding is protected using a differential current scheme with current transformers of ratio 400/5 A as shown. The current through the operating coil is

Question diagram

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9
2010 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2010
A 50 Hz synchronous generator is initially connected to a long lossless transmission line which is open circuited at the receiving end. With the field voltage held constant, the generator is disconnected from the transmission line. Which of the following may be said about the steady state terminal voltage and field current of the generator ?
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10
2011 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2011

A three-phase, salient pole synchronous motor is connected to an infinite bus. It is operated at no load at normal excitation. The field excitation of the motor is first reduced to zero and then increased in the reverse direction gradually. Then the armature current

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11
2011 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2011
The direct axis and quadrature axis reactances of a salient pole alternator are 1.2 p.u and 1.0 p.u respectively. The armature resistance is negligible. If this alternator is delivering rated kVA at upf and at rated voltage then its power angle is
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12
2014 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2014 [Session 1]
A star connected 400 V, 50 Hz, 4 pole synchronous machine gave the following open circuit and short circuit test results:
Open circuit test: $V_{oc} = 400$ V (rms, line-to-line) at field current, $I_f = 2.3$ A
Short circuit test: $I_{sc} = 10$ A (rms, phase) at field current, $I_f = 1.5$ A
The value of per phase synchronous impedance in $\Omega$ at rated voltage is ______________.
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13
2014 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2014 [Session 1]
A three phase synchronous generator is to be connected to the infinite bus. The lamps are connected as shown in the figure for the synchronization. The phase sequence of bus voltage is R-Y-B and that of incoming generator voltage is R'-Y'-B'.

It was found that the lamps are becoming dark in the sequence La-Lb-Lc. It means that the phase sequence of incoming generator is
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14
2014 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2014 [Session 2]
A 20-pole alternator is having 180 identical stator slots with 6 conductors in each slot. All the coils of a phase are in series. If the coils are connected to realize single-phase winding, the generated voltage is V₁. If the coils are reconnected to realize three-phase star-connected winding, the generated phase voltage is V₂. Assuming full pitch, single-layer winding, the ratio V₁/V₂ is
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15
2014 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2014 [Session 2]
A synchronous generator is connected to an infinite bus with excitation voltage E_f = 1.3 pu. The generator has a synchronous reactance of 1.1 pu and is delivering real power (P) of 0.6 pu to the bus. Assume the infinite bus voltage to be 1.0 pu. Neglect stator resistance. The reactive power (Q) in pu supplied by the generator to the bus under this condition is __________.
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16
2014 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2014 [Session 3]
In a synchronous machine, hunting is predominantly damped by
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17
2016 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2016 [Session 1]
Consider a system consisting of a synchronous generator working at a lagging power factor, a synchronous motor working at an overexcited condition and a directly grid-connected induction generator. Consider capacitive VAr to be a source and inductive VAr to be a sink of reactive power. Which one of the following statements is TRUE?
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18
2016 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2016 [Session 1]
A three-phase, 50 Hz salient-pole synchronous motor has a per-phase direct-axis reactance (\(X_d\)) of 0.8 pu and a per-phase quadrature-axis reactance (\(X_q\)) of 0.6 pu. Resistance of the machine is negligible. It is drawing full-load current at 0.8 pf (leading). When the terminal voltage is 1 pu, per-phase induced voltage, in pu, is ________.
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19
2016 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2016 [Session 2]
A 50 MVA, 10 kV, 50 Hz, star-connected, unloaded three-phase alternator has a synchronous reactance of 1 p.u. and a sub-transient reactance of 0.2 p.u. If a 3-phase short circuit occurs close to the generator terminals, the ratio of initial and final values of the sinusoidal component of the short circuit current is ________.
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20
2016 · Electrical Engineering · Electrical Machines · Synchronous Machines
Electrical Engineering (EE) 2016 [Session 2]
The power consumption of an industry is 500 kVA, at 0.8 p.f. lagging. A synchronous motor is added to raise the power factor of the industry to unity. If the power intake of the motor is 100 kW, the p.f. of the motor is ______.
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Showing 20 of 37 questions