Download PTU M.Tech. EE 3rd Semester 51075 ENERGY EFFICIENT MACHINES Question Paper

Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. EE 3rd Semester 51075 ENERGY EFFICIENT MACHINES Question Paper.

1 | M-51075 (S35)-878

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech. (Electrical Power System) (Sem.?3)
ENERGY EFFICIENT MACHINES
Subject Code : EEPS-302
M.Code : 51075
Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

1. i) Explain how energy conservation can be achieved in industry and agriculture sectors.
ii) Draw the speed torque characteristics of an induction motor and explain it in detail.
2. Define Efficiency. Discuss any two methods which are used in finding out the efficiency
of a motor.
3. i) Define power factor. What are the causes of low power factor?
ii) Find the power factor of an installation supplying the following loads :
300 kW at unity power factor, 1000 kW at 0.9 lagging power factor and 1500 kW at
0.8 lagging power factor. Also find the maximum load at unity power factor which
can be supplied by this substation.
4. i) Discuss the factors on which the selection of an energy-efficient motor depends.
ii) Explain the types and characteristics of electric motor loads.
5. Discuss the applications of adjustable speed systems to pumps, fans and constant load
torques.
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1 | M-51075 (S35)-878

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech. (Electrical Power System) (Sem.?3)
ENERGY EFFICIENT MACHINES
Subject Code : EEPS-302
M.Code : 51075
Time : 3 Hrs. Max. Marks : 60

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWELVE marks.

1. i) Explain how energy conservation can be achieved in industry and agriculture sectors.
ii) Draw the speed torque characteristics of an induction motor and explain it in detail.
2. Define Efficiency. Discuss any two methods which are used in finding out the efficiency
of a motor.
3. i) Define power factor. What are the causes of low power factor?
ii) Find the power factor of an installation supplying the following loads :
300 kW at unity power factor, 1000 kW at 0.9 lagging power factor and 1500 kW at
0.8 lagging power factor. Also find the maximum load at unity power factor which
can be supplied by this substation.
4. i) Discuss the factors on which the selection of an energy-efficient motor depends.
ii) Explain the types and characteristics of electric motor loads.
5. Discuss the applications of adjustable speed systems to pumps, fans and constant load
torques.
2 | M-51075 (S35)-878

6. Explain briefly :
i) Direct savings and pay back analysis
ii) Efficiency evaluation factor
7. i) What is tariff? Explain the different types of tariff.
ii) An industrial undertaking has a connected load of 100 kW. The maximum demand is
80 kW. On an average each machine works for 60 % time. Find the yearly
expenditure on electricity if the tariff is Rs. 8000 + Rs. 900 per kW of maximum
demand per year + Re 2.40 per kWh.
8. Explain briefly :
i) Motor life cycle
ii) Energy efficient motor standards.








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