GTU BE 2019 Summer Question Papers || Gujarat Technological University
Date: 04/06/2019
Subject Name: Electrical Drives And Controls
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Time: 02:30 PM TO 05:00 PM
Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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- What is an electrical drive? Draw the block diagram of electrical drives and explain it. Also discuss its advantages? (07)
- Explain motors used in steel rolling mills, cranes & hoists, coal & mining industry. (07)
- What are the different electrical braking methods used in electrical drives. Explain the method applied to DC motor? (07)
- Explain types of DC motors with equation. (07)
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OR
Calculate the value of torque developed by the armature of a 4 pole motor having 774 conductors, two paths in parallel, 24mWb flux per pole, when loaded the total armature current is 50 A. (07) - Derive torque equation of Induction motor, starting torque. Also explain the condition for maximum torque. (07)
- Explain shaded pole induction motor with neat diagram. (07)
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Explain the starting method of slip ring induction motor? (07) - What are the needs of starter? Explain the 3-point starter with neat diagram? (07)
- Explain the chopper control of separately excited DC motor? (07)
- Explain plugging and regenerative braking for induction motor. (07)
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Describe the ward-Leonard speed control method? (07) - Explain voltage/frequency speed control method for induction motor. (07)
- Compare half controlled & full controlled rectifier. (07)
- Compare VSI and CSI. (07)
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Explain Static slip power recovery scheme. (07) - Explain the method of control of three phase induction motor by (1) Stator voltage control (2) frequency control (07)
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III(OLD) EXAMINATION - SUMMER 2019
Subject Code: 133402
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