Download Previous Year PTU University Question Paper of Synchronous Machines 5th Sem BTEE-501 B.Tech EE PTU Sept 2020 Paper
B.Tech.(EE-2011 Batch)
SYNCHRONOUS MACHINES
Subject Code : BTEE-501 M.Code : 70554
Download Previous Year PTU University Question Paper of Asynchronous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 Paper
Time : 2 Hrs. Max. Marks : 30
INSTRUCTIONS TO CANDIDATES : 1. Attempt any FIVE question(s), each question carries 6 marks.
Synchronous Machines 5th Sem BTEE-501 B.Tech EE PTU Sept 2020 Paper
SECTION-A
1. Draw and explain equivalent circuit and phasor diagram of an alternator. 2. Derive pitch factor. Discuss the effect of harmonics on this factor. Also discuss the necessity of chording the armature windings.
3. Explain two reaction theory of salient pole machines. 4. Write a note on following : a) Transient reactance of synchronous machines b) Rating of Alternator is in kVA not in kW. Explain why.
5. Explain with the help a neat sketch the construction and working of Reluctance type Single phase synchronous motor. 6. Discuss EMF method for calculating voltage regulation of an alternator. 7. What are the conditions of parallel operation of alternators? Also state advantages of the parallel operation. 8. Explain why a three phase synchronous motor is not self starting. Describe two methods used to start this motor.
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3-phase cage rotor induction motor has a full load slip at 4%. The standstill current at rated voltage is 6.5 times full load current. Find auto transformer tapping to give full load torque at starting and also find line current at starting.
How the stationary, pulsating m.m.f. wave of a single phase induction motor can be considered as equivalent to two equal but oppositely rotating m.m.f. waves.
Various methods of excitation of induction generator.
Asynchronous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 Paper Click Here
Asynchro
nous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 Paper
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https://www.youtube.com/watch?v=UHX6f8TIvX8https://www.youtube.com/watch?v=M_RR6LVICp0https://www.youtube.com/watch?v=mV41CMWonN4https://www.youtube.com/watch?v=s0LVPE0Q3LE&list=PLA9Q9SDZ781WXNAWit379A4CRLMvjGiUw&index=14&t=0s
1100 V, 50 Hz star connected induction motor has a star connected slip-rings rotor with a transformation ratio of 3.8 the rotor resistance per phase is 0.012 Ohm. and leakage inductance is 0.8 mH per phase. Neglect’ stator impedance.
Working of universal motor and draw its phasor diagram.
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Time : 2 Hrs. Max. Marks : 30
INSTRUCTIONS TO CANDIDATES : 1. Attempt any FIVE question(s), each question carries 6 marks.
4-pole, 3-phase, 50 Hz induction machine, the slip-rings of the machine are open- circuited. The frequency of the voltage across slip-rings is 75 Hz. Find the speed at which the rotor is driven.
No-load speed of a 3-phase 50 Hz induction motor is 1485 rpm. Find the number of alterations per minute which the rotor emf will make and the speed of rotor mmf with respect to rotor wound.
Stator of a 4-pole, 3-phase induction machine is supplied from 3-phase, 50 Hz supply and a prime-mover drives its rotor at a speed of 750 rpm. The slip-rings of the machine are open-circuited. Find the frequency of the voltage across any two slip-rings.
Explain Why does a 3-phase induction motor always run at a speed less than the synchronous speed.
Synchronous Machines 5th Sem BTEE-501 B.Tech EE PTU Sept 2020 Paper Click Here
Synchronous Machines 5th Sem BTEE-501 B.Tech EE PTU Sept 2020 Paper
Get Started
https://www.youtube.com/watch?v=UHX6f8TIvX8https://www.youtube.com/watch?v=M_RR6LVICp0https://www.youtube.com/watch?v=mV41CMWonN4https://www.youtube.com/watch?v=s0LVPE0Q3LE&list=PLA9Q9SDZ781WXNAWit379A4CRLMvjGiUw&index=14&t=0s
MY YOUTUBE CHANNEL
JK Smart Classes Upload Lecture for Degree classes like B.TECH,M.TECH in any stream like ECE,EE,ME and Civil Engineering
JK SMART CLASSES
ER.JASWINDER KUMAR
JK SMART LECTURE
ER.JASWINDER KUMAR
Engineering Classes Upload Lecture for Polytechnic Diploma classes in any stream like ECE,EE,ME and Civil Engineering
ENGINEERING CLASSES
ER.JASWINDER KUMAR
er.jaswinder kumar
Senior Lecturer
JK SMART CLASSES
ER.JASWINDER KUMAR