Download PTU B.Tech 2020 March Automation-And-Robotics Question Paper 6th Sem EE 202 Electromechanical Energy Conversion & Dc Machines

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech Automation-And-Robotics 6th Sem EE 202 Electromechanical Energy Conversion & Dc Machines 2020 March Previous Question Paper

1 | M - 7 1 0 6 3 ( S 2 ) - 1 6 0 5
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2012 & Onwards)
ELECTROMECHANICAL ENERGY CONVERSION & DC MACHINES
(Sem.?6)
Subject Code : EE-202
M.Code : 71063
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION 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.

SECTION A
1. Answer briefly :
a) Give working principle of generator.
b) State Lenz law.
c) Why the core of a machine is laminated?
d) What is armature reaction in dc machines?
e) What is regenerative breaking used in dc machines?
f) Define field energy & coenergy.
g) What is the purpose of compensating winding in cross field generators?
h) Define the term induced torque & reluctance torque.
i) Why starters are used in dc machines?
j) Give the working principle of metadyne.
FirstRanker.com - FirstRanker's Choice
1 | M - 7 1 0 6 3 ( S 2 ) - 1 6 0 5
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2012 & Onwards)
ELECTROMECHANICAL ENERGY CONVERSION & DC MACHINES
(Sem.?6)
Subject Code : EE-202
M.Code : 71063
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION 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.

SECTION A
1. Answer briefly :
a) Give working principle of generator.
b) State Lenz law.
c) Why the core of a machine is laminated?
d) What is armature reaction in dc machines?
e) What is regenerative breaking used in dc machines?
f) Define field energy & coenergy.
g) What is the purpose of compensating winding in cross field generators?
h) Define the term induced torque & reluctance torque.
i) Why starters are used in dc machines?
j) Give the working principle of metadyne.
2 | M - 7 1 0 6 3 ( S 2 ) - 1 6 0 5
SECTION-B
2. Show that the energy stored in a magnetic field is equal to the area between ? ?F curve
for the system & the flux axis.
3. Derive an expression for electromagnetic torque in an AC machine with cylindrical air
gap. State the assumptions made.
4. Draw & explain torque vs. armature current & speed vs. armature current characteristics
of a series motor.
5. Draw & explain the construction & working of 3 point starter.
6. Discuss the principle of operation & characteristics of an amplidyne.

SECTION-C
7. Draw and explain the open circuit characteristics of shunt generator. Hence give the
conditions for build up of voltage in it.
8. A series motor with an unsaturated magnetic circuit & 0.5 ohm total resistance, when
running at a certain speed takes 60 A at 500 V. If the load torque varies as the cube of the
speed, calculate the resistance required to reduce the speed by 25%.
9. The Hopkinson test on two shunt machines gave the following results for full load line
voltage 250V, line current excluding field currents 45A, motor armature current
385A, field currents 5A ad 4.0A. Calculate the efficiency of each machine. Armature
resistance of each machine 0.015 ohm.






NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
FirstRanker.com - FirstRanker's Choice