Gujarat Technological UniversitySummer 2024 examination

GTU 3150910 Electrical Machine- II Summer 2024 Question Paper & PDF

B.E. · Electrical Engineering · Semester 5 · Subject code 3150910
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Explain necessity of starter in 3-phase induction motor.
(b)
4 marks

State different types of starters used and explain any one of them in 3- ø induction motor.

(c)
7 marks

Explain how a rotating magnetic field is produced when a three phase supply is given to three phase winding.

Q.2

14 Marks
(a)
3 marks
Define slip. how it relates with rotor speed?
(b)
4 marks

State the difference between slip ring induction motor and squirrel cage induction motor.

(c)
7 marks

State different methods of speed control of three phase induction motor. Explain any two of them.

(c)
7 marks

Derive the equation of starting torque for 3-ø induction motor and obtain condition of maximum starting torque from it.

Q.3

14 Marks
(a)
3 marks
Write the applications of 1-ø induction motors.
(b)
4 marks
Explain working of split phase induction motor.
(c)
7 marks
Explain two field rotating theory of 1-ø induction motor with diagram.
(a)
3 marks
Explain why 1-ø induction motor is not self starting.
(b)
4 marks
Explain working of capacitor start induction motor.
(c)
7 marks

List the methods of starting of 1-ø induction motor. Draw and explain construction and working of shaded pole induction motor.

Q.4

14 Marks
(a)
3 marks
State the conditions for synchronization of 3 phase alternator with infinite bus bar.
(b)
4 marks
Explain Pitch factor and Distribution factor with reference to alternator winding.
(c)
7 marks

A 3-phase, 50 Hz alternator is running at 600 rpm has a 2-layer winding, 12 turns/coil, 4 slots/pole/phase, and coil-pitch of 10 slots. Find the induced EMF per phase if the flux/pole is 0.035 Weber.

(a)
3 marks

Write the difference between stationary armature type and rotating armature type alternator.

(b)
4 marks
Explain concept of synchronous reactance in synchronous machine.
(c)
7 marks

A 3-phase star connected alternator is rated at 1600 KVA; 13500 V. The armature effective resistance and synchronous reactance are 1.5 ohms and 30 ohms respectively per phase. Calculate the percentage voltage regulation at full load, 0.8 lagging power factor.

Q.5

14 Marks
(a)
3 marks
Explain methods of starting of synchronous motor.
(b)
4 marks
Explain working principle of stepper motor.
(c)
7 marks

A 6 pole three phase 440 V, 50 Hz. Induction motor develops 8 H.P. at 955 rpm, stator losses amount to 400 watts and the friction losses 0.5 H.P., Calculate

i)rotor copper loss
ii)efficiency of motor.
(a)
3 marks
Explain synchronous condenser.
(b)
4 marks
Explain magnetic levitation principle.
(c)
7 marks
Draw and explain different vector diagrams of synchronous motor on load.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Electrical Machine- II (Summer 2024, B.E. · Electrical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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