GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2171707 Date: 10/05/2019
Subject Name: Industrial Drives and Control
Time: 02:30 PM TO 05:00 PM
Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1
(a) Define the base speed in DC shunt motor [03]
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(b) Discuss various methods for scalar control of induction motor. [04]
(c) Write characteristic equation for DC series and DC shunt motors. Give state space model for both these motors. [07]
Q.2
(a) Enumerate important components of electric motor drives. [03]
(b) Which are the torque producing and flux producing components of DC shunt motor. Draw vector relationship of these components. [04]
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(c) Explain four quadrant operation of DC motor drive. [07]
OR
(c) Give block diagram representation of working of DC series motor and derive its transfer function. [07]
Q.3
(a) List out various chopper topologies known to you. [03]
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(b) Explain inversion mode of chopper operation. [04]
(c) Give output voltage waveform of full wave controlled rectifier, driving DC shunt motor, for both continuous and discontinuous conduction mode. [07]
OR
Q.3
(a) Draw any appropriate circuit to convert line voltage into chopper input voltage of 200 VDC. [03]
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(b) Explain the closed loop operation of chopper with necessary block diagram. [04]
(c) With circuit and necessary waveforms explain the first quadrant operation of chopper controlled DC motor. [07]
Q.4
(a) Give the torque equation for 3 phase induction motor. [03]
(b) Enumerate various static frequency changers [04]
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(c) Explain with necessary circuit diagram, the working of modified full bridge Macmurray voltage source inverter [07]
OR
Q.4
(a) What is the meaning of real power and reactive power in induction motor drive? [03]
(b) Give the equations for real power and reactive power for induction motor. [04]
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(c) Discuss any method of implementation of Volts/Hz strategy in induction motor. [07]
Q.5
(a) Draw torque v/s angular displacement characteristic curve for 4 phase VR step motor [03]
(b) What are the necessities of operating step motor in closed loop? Explain. [04]
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(c) With necessary circuit diagram and waveforms, explain active suppression drive for step motor. [07]
OR
Q.5
(a) Draw torque v/s angular displacement characteristic curve for 3 phase PM step motor [03]
(b) With block diagram explain DC servo control [04]
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(c) With necessary circuit and waveforms, explain diode + resistance type and capacitor suppression drive for step motor. [07]
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