Download Previous Year PTU University Question Paper of EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU Nov 2016 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 Nov 2016 Paper
SECTION-A
Q1. Write Short Notes on :
(a) What is the significance of coenergy in the torque derivation of an electrochemical energy conversion device?
(b) Define Electric field energy.
(c) What is meant by SPP?
(d) Define Distribution factor & Breadth factor.
(e) Compare lap and wave winding.
(f) Why carbon brushes are used in D.C. machines?
(g) What is the purpose of interpole & compensating winding?
(h) Why differential compound motor is not used practically?
(i) Why series motor can’t be used in belt pulley arrangement?
(j) Define critical field circuit resistance for shunt generator.
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. Explain the principle & working of hysteresis motor.
3. Explain why distributed field winding is employed in a cylindrical rotor machine.
4. Derive emf equation for D.C. generator.
5. Explain a method used for getting a speed more than the rated speed in D.C. shunt motor.
6. Explain the principle & working of cross field generator.
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. Draw & explain the load characteristics of D.C. shunt generator & hence show that it is self protecting in nature.
8. Why starters are used in D.C. machines? Explain the construction & working of three point starter.
9. The Hopkinson’s test on two machines gave the following results for full load : Line voltage 250V; line current excluding field current 50A; motor armature current 380A; field current 5A and 4.2A. Calculate the efficiency of each machine. Armature resistance of each machine is 0.02 Ohm. State the assumptions made.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU Nov 2016 Paper
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU nov 2016 Paper
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Hopkinson’s test on two machines gave the following results for full load : Line voltage 250V; line current excluding field current 50A; motor armature current 380A; field current 5A and 4.2A.
Find the efficiency of each machine. Armature resistance of each machine is 0.02 Ohm. State the assumptions made.
EMEC & DC Machines EE-202 4th Sem B.Tech EE PTU Nov 2016 Paper
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