Exam Details
| Subject | utilization of electrical energy | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
(AUTONOMOUS)
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R14)
UTILIZATION OF ELECTRICAL ENERGY
(Electrical and Electronics Engineering)
Date: 17 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. Classify various electric drives. 7M
Differentiate continuous, intermittent and variable loads with example.
8M
2. Discuss in general the various speed control methods adopted for motors. 8M
Explain the applications of industrial drives.
7M
Unit II
3. Explain the construction and working of high frequency induction furnace, stating its
applications.
7M
A piece of an insulating material is to be heated by dielectric heating. The size of the
piece is 12cm×12cm×3cm. A frequency of 20MHz is used and the power absorbed is
450W. If the material has a relative permittivity of 5 and a power factor of 0.05, calculate
the voltage necessary for heating and current that follows in the material.
8M
4. Explain indirect arc furnace stating the advantages. 8M
Explain the various types of electric arc welding.
7M
Unit III
5. Explain the Construction and working of sodium vapour lamp with a sketch. 8M
What do you mean by flood lighting? Define the following terms:
i. Waste light factor
ii. Coefficient of utilization
7M
6. Explain the various artificial sources of light. 7M
Explain the laws of illumination with relevant equations.
8M
Unit IV
7. Write short note on the existing electric traction system in India. 7M
Explain the following:
i. Rheostatic braking
ii. Regenerative braking
8M
8. Describe the special features of a traction motor. 7M
Discuss the advantages and disadvantages of regenerative braking.
8M
Unit V
9. Explain the following:
i. Coefficient of adhesion
ii. Adhesive weight
6M
An electric train accelerates uniformly from rest to a speed of 48kmph in 24 seconds. It
then coasts for 69 seconds against a constant resistance of 58N per tonne and is braked
to rest at 3.3kmphps in 11 seconds. Calculate:
i. Acceleration
ii. Coasting retardation
iii. The schedule speed, if the station stops are of 20 seconds duration
Allow 10% of rotational inertia.
9M
Cont…2
2
10. Explain the mechanics of the train movement. 7M
An electric train weighing 200tonnes has 8 motors geared to driving wheels, each wheel is
90cm diameter. Determine the torque developed by each motor to accelerate the train to
a speed of 48kmph in 30 seconds up a gradient of 1 in 200. The tractive resistance is of 50
Newtons per tonne, the rotational inertia is 10% of the train weight, the gear ratio is 4 to
1 and gearing efficiency is 80%.
B. Tech VII Semester Supplementary Examinations, May 2018
(Regulations: VCE-R14)
UTILIZATION OF ELECTRICAL ENERGY
(Electrical and Electronics Engineering)
Date: 17 May, 2018 AN Time: 3 hours Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1. Classify various electric drives. 7M
Differentiate continuous, intermittent and variable loads with example.
8M
2. Discuss in general the various speed control methods adopted for motors. 8M
Explain the applications of industrial drives.
7M
Unit II
3. Explain the construction and working of high frequency induction furnace, stating its
applications.
7M
A piece of an insulating material is to be heated by dielectric heating. The size of the
piece is 12cm×12cm×3cm. A frequency of 20MHz is used and the power absorbed is
450W. If the material has a relative permittivity of 5 and a power factor of 0.05, calculate
the voltage necessary for heating and current that follows in the material.
8M
4. Explain indirect arc furnace stating the advantages. 8M
Explain the various types of electric arc welding.
7M
Unit III
5. Explain the Construction and working of sodium vapour lamp with a sketch. 8M
What do you mean by flood lighting? Define the following terms:
i. Waste light factor
ii. Coefficient of utilization
7M
6. Explain the various artificial sources of light. 7M
Explain the laws of illumination with relevant equations.
8M
Unit IV
7. Write short note on the existing electric traction system in India. 7M
Explain the following:
i. Rheostatic braking
ii. Regenerative braking
8M
8. Describe the special features of a traction motor. 7M
Discuss the advantages and disadvantages of regenerative braking.
8M
Unit V
9. Explain the following:
i. Coefficient of adhesion
ii. Adhesive weight
6M
An electric train accelerates uniformly from rest to a speed of 48kmph in 24 seconds. It
then coasts for 69 seconds against a constant resistance of 58N per tonne and is braked
to rest at 3.3kmphps in 11 seconds. Calculate:
i. Acceleration
ii. Coasting retardation
iii. The schedule speed, if the station stops are of 20 seconds duration
Allow 10% of rotational inertia.
9M
Cont…2
2
10. Explain the mechanics of the train movement. 7M
An electric train weighing 200tonnes has 8 motors geared to driving wheels, each wheel is
90cm diameter. Determine the torque developed by each motor to accelerate the train to
a speed of 48kmph in 30 seconds up a gradient of 1 in 200. The tractive resistance is of 50
Newtons per tonne, the rotational inertia is 10% of the train weight, the gear ratio is 4 to
1 and gearing efficiency is 80%.
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