Deemed University 2010 M.Tech Electrical & Electronics Engineering University: Lingayas University Term: III Title of the : Electrical Drives - Question Paper

Roll No. ..

 

Lingayas University, Faridabad

M.Tech (Part-Time) Electrical Engg.

Term-III Examination May, 2010

Electrical Drives (EL -504)

[Time: 3 Hours] [Max. Marks: 100]

 

Before answering the question, candidate should ensure that they have been supplied the correct and complete question paper. No complaint in this regard, will be entertained after examination.

 

Note: Question No. 1 Section A is compulsory. Attempt any two questions from Section B and any two questions from Section C. In all attempt five questions.

Section A

Q-1 (i) Name any five power converters used in the machine control. (2.5)

(ii) Name any two methods of analysis of induction motor on non-sinusoidal voltage waveforms. (2.5)

(iii) The input displacement factor decides the fundamental current drawn. It is more at poor power factors for the same power demand. This is true or false for DC drive performance. (2.5)

(iv) What is coefficient of Adhesion in the Electric Traction? (2.5)

(v) Explain plugging in brief. (2.5)

(vi) Describe speed reversal in brief. (2.5)

(vii) Name any two energy efficient motors used in domestic apparatus. (2.5)

(viii) Name any two applications of stepper motor. (2.5)

Section B

Q-2. Describe closed loop control of speed, current and torque for electric drive system. (20)

Q-3. Derive and describe expression for Energy loss during speed reversal of electric motor. (20)
Q-4. Explain, continuous, intermittent and short-time service conditions of Electric Drives. (20)
Section C

Q-5. Write a note on different measures to be taken for energy conservation in electric drives. (20)

Q-6. Describe choices of motors with ratings for traction drives. (20)

Q-7. Explain, two-quadrant electric converter. (20)

Q-8. Describe, performance of a current source inverter fed Induction Motor. (20)

Roll No. ..

 

Lingayas University, Faridabad

M.Tech (Part-Time) Electrical Engg.

Term-III Examination May, 2010

Electrical Drives (EL -504)

[Time: 3 Hours] [Max. Marks: 100]

 

Before answering the question, candidate should ensure that they have been supplied the correct and complete question paper. No complaint in this regard, will be entertained after examination.

 

Note: Question No. 1 Section A is compulsory. Attempt any two questions from Section B and any two questions from Section C. In all attempt five questions.

Section A

Q-1 (i) Name any five power converters used in the machine control. (2.5)

(ii) Name any two methods of analysis of induction motor on non-sinusoidal voltage waveforms. (2.5)

(iii) The input displacement factor decides the fundamental current drawn. It is more at poor power factors for the same power demand. This is true or false for DC drive performance. (2.5)

(iv) What is coefficient of Adhesion in the Electric Traction? (2.5)

(v) Explain plugging in brief. (2.5)

(vi) Describe speed reversal in brief. (2.5)

(vii) Name any two energy efficient motors used in domestic apparatus. (2.5)

(viii) Name any two applications of stepper motor. (2.5)

Section B

Q-2. Describe closed loop control of speed, current and torque for electric drive system. (20)

Q-3. Derive and describe expression for Energy loss during speed reversal of electric motor. (20)
Q-4. Explain, continuous, intermittent and short-time service conditions of Electric Drives. (20)
Section C

Q-5. Write a note on different measures to be taken for energy conservation in electric drives. (20)

Q-6. Describe choices of motors with ratings for traction drives. (20)

Q-7. Explain, two-quadrant electric converter. (20)

Q-8. Describe, performance of a current source inverter fed Induction Motor. (20)