Download Previous Year PTU University Question Paper of Power System-1 BTEE-405 4th Sem Batch 2011 Onwards B.Tech PTU April 2019 Question Paper
B.Tech.(EE-2011 Batch)
POWER SYSTEM-1
Subject Code : BTEE-405 Paper ID : [ A1208]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2019 Question Paper
SECTION-A
Q1. Write Short Notes on :
a. Define slip of an induction motor.
b. Explain slip frequency of a 3-phase induction motor.
c. Why an induction motor operates at a very low power factor under no-load?
d. Why an induction motor cannot run at synchronous speed?
e. Write two application of single-phase induction motor.
f. Why starting current is high for an induction motor?
g. Why airgap between stator and rotor of induction motor is very small?
h. If a single-phase induction motor is started with auxiliary winding open, what will happen?
i. How direction of rotation of a three-phase induction motor can be reversed?
j. Write the difference between a squirrel cage and slip ring induction motor.
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. Discuss losses in a 3-phase induction motor.
3. Sketch and explain toque-slip characteristics of 3-phase induction motor.
4. Explain the starting of squirrel cage induction motor by using Direct-on-line method.
5. Explain how higher starting torque can be obtained in :
a. Squirrel cage induction motor
b. Wound rotor induction motor.
6. Explain how rotating torque is generated in a single-phase induction motor
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. Write the constructional features, working principle and applications of single-phase reluctance motor. 8. A 230V, 380W, 60 Hz, 4-pole, single phase induction motor gave the following test results : No-load test : 230V, 84W, 2.8A Blocked-rotor test : 110V, 460W, 6.2A The stator winding resistance is 4.5 ohms and during the blocked rotor test, the auxiliary winding is open. Determine the equivalent circuit parameters and draw the equivalent circuit. 9. Describe the methods of speed control of three phase induction motor.
How rotating torque is generated in a single-phase induction motor
Power System-1 4th Sem Batch 2011 B.Tech PTU April 2019 Question Paper
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2019 Question 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
A 230V, 380W, 60 Hz, 4-pole, single phase induction motor gave the following test results : No-load test : 230V, 84W, 2.8A Blocked-rotor test : 110V, 460W, 6.2A The stator winding resistance is 4.5 ohms and during the blocked rotor test, the auxiliary winding is open. Determine the equivalent circuit parameters and draw the equivalent circuit.
Methods of speed control of three phase induction motor.
Power System-1 4th Sem Batch 2011 B.Tech PTU April 2019 Question Paper
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
Download Previous Year PTU University Question Paper of EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
B.Tech.(EE-2011 Batch)
EMEC & DC Machines
Subject Code : EE-202 Paper ID : [ A0407]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
SECTION-A
Q1. Write Short Notes on :
a) Why there is need of starters for DC motors? b) List the main parts of DC machine. What is importance of a commutator? c) How can we obtain the internal characteristics from external characteristics of a DC shunt generator? d) State and briefly discuss the principle of electromechanical energy conversion with one simple example. e) Define winding factors and benefits of short pitched coils. f) What is the function of compensation winding in a DC machine? g) If DC motor fails to start when switched on. What could be the possible reasons and remedies? h) When load is removed, _______ motor will run at the highest speed. i) Show the energy in magnetic field is expressed as E=l/2mH2=b2/2m j) Draw schematic diagram of a metadyne generator which behaves as a constant current generator.
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. What is commutations? What causes sparking on the commutator surface and how can it be avoided? Explain. 3. Discuss flow of energy in electromechanical devices via coupling fields to confirm the generating and motoring principles. 4. Classify DC generators. Show VI characteristics of all type of DC generators. 5. Explain why the speed torque characteristic of DC shunt motor is not linear in the high torque region. 6.A 60 KW, 250 V shunt motor takes 16A when running at 1440 The resistance of the armature and field are 0.2 Ohm and 125 Ohm respectively.When hot
a) Estimate the efficiency of the motor when taking 152A. b) Also estimate the efficiency if working as a generator and delivering a load current of 152A at 250 V.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. (a) What is the percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss? (b) Show that in a string of suspension insulators, the disc nearest to the conductor has the highest voltage across it. (6,4) 8. (a) Describe the Receiving end circle diagram for long transmission lines based on ABCD constants. (b) Discuss the effect of earth on capacitance of conductors. (6,4) 9. Write short notes on any two of the followings : (a) Synchronous phase modifiers (b) Kelvin’s law (c) Compensation of transmission lines. (2×5)
Estimate the efficiency if working as a generator and delivering a load current of 152A at 250 V.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 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
Find percentage saving in feeder copper if the line voltage in a 2-wire dc system is raised from 200 volts to 400 volts for the same power transmitted over the same distance and having the same power loss.
Short Note on (c) Compensation of transmission lines.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU April 2013 Paper
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
Download Previous Year PTU University Question Paper of Asynchronous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 Paper
B.Tech.(EE-2011 Batch)
ASYNCHRONOUS MACHINES
Subject Code : BTEE-401 Paper ID : [ A1208]
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES : 1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each. 2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions. 3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Power System-1 4th Sem Batch 2011 Onwards B.Tech PTU April 2013 Question Paper
SECTION-A
Q1. Write Short Notes on :
a. In a 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. b. The 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. c. The 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. d. What are the limitations of induction generator? e. State the condition for maximum torque in a 3-phase induction motor. f. The rotating fields of the stator and rotor are stationary with respect to each other. Justify the statement. g. What happens to a 3-phase induction motor if one of its three supply-leads gets disconnected? h. A 6-pole, 50 Hz single-phase induction motor runs at a speed of 900 rpm. Calculate the frequency of current in the cage rotor. i. In a 3-phase induction motor, maximum torque of 100 Nm occurs at a slip of 10%. Calculate the torque at a slip of 5%. j. Why does a 3-phase induction motor always run at a speed less than the synchronous speed?
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. A 3-phase induction motor crawls near half synchronous speed. Give the reasons. 3. A 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. 4. Explain 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. 5. Describe the constructional features and working of stepper motor. 6. Describe various methods of excitation of induction generator.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. An 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 . and leakage inductance is 0.8 mH per phase. Neglect’ stator impedance. Find (a) the rotor starting current per phase with slip rings short circuited, (b) the rotor power factor at starting, (c) the external resistance per phase to obtain a starting current of 100A in the stator and (d) the rotor current at 4% slip. 8. Explain, how the equivalent circuit of an ordinary polyphase induction motor is also applicable to deep-bar induction motors. 9. Explain the working of universal motor and draw its phasor diagram.
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.
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
Asynchro
nous Machines 4th Sem BTEE-401 B.Tech EE PTU Nov 2018 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
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.
Asynchronous Machines 4th Sem B.Tech EE PTU Nov 2018 Paper
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
