Roll No. :
Total No. of Pages : 02
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Total No. of Questions: 18
B.Tech. (EE) (2012 Onwards E-III) (Sem.-7)
ENERGY EFFICIENT MACHINES
Subject Code : BTEE-805D
M.Code : 71945
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Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
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SECTION-A
Write briefly :
- How is an energy efficient motor different than a standard motor?
- Do energy efficient motors require more maintenance?
- Should one rewind my standard-efficiency motor or purchase an energy efficient motor?
- What horsepower, speed and voltage ranges are available?
- What is the efficiency of an energy efficient motor at different load points?
- What is the power factor of an energy efficient motor?
- Can a standard motor be rewound as an energy efficient motor?
- Is the service factor any different from that of a standard motor?
- What is the payback period for selecting an energy efficient versus a standard-efficiency motor?
- Aren't energy efficient motors unsuitable for adjustable speed drive applications?
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SECTION-B
- Write some applications of constant torque and variable torque loads. Write a short note on a 'Multi-Speed Motor'.
- How do you size the capacitor rating required for an induction motor? Write some strategies for correcting poor power factor in motors.
- Comment on 'Construction Aspects' how an "Energy Efficient Motor" is different from a "Standard Motor"? List down some ill-suited applications for 'Energy Efficient Motors'.
- Why 'Induction Motors' are so popular over all types of motors? How do you define percentage unbalance in voltage?
- Why is it beneficial to operate motors in star mode for under loaded motors? What is the thumb rule for installing capacitors to motor terminal?
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SECTION-C
- A 4-pole 415 V 3-phase, 50 Hz induction motor runs at 1440 RPM at .88 pf lagging and delivers 10.817 kW. The stator loss is 1060 W, and friction & windage losses are 375 W. Calculate A. Slip, B. Rotor Copper loss, C. Line current and D. Efficiency
- What are the effects of harmonics on motor operation and performance? Calculate the annual energy-savings and simple payback from replacing an existing standard motor with a premium efficiency Motor versus repairing a standard efficiency motor with a sample example.
- Discuss direct measurement method and loss segregation method to determine the efficiency of energy efficient methods.
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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.
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This download link is referred from the post: PTU B.Tech 2021 January Previous Question Papers || PTU Punjab Technical University