Engineering B.E. (Electrical Engineering) Sem 7 December 2022 2022 Electrical Drives And Control Question Paper - Mumbai University | munotes
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Questions asked in this paper
(3 Hours) Total Marks: 80
NB: (1) Question No. | is compulsory
(2) Answer any THREE questions out of the remaining FIVE questions
(3) Assume suitable data if necessary and justify them
(4) Figure to the right indicates marks
1 (a) What are the main factors which decide the choice of electrical drive for a given 5
(b) State and explain with neat sketches the three main classes of motor duty cycle 5
(c) With speed torque characteristics, explain the stator voltage control of induction 5
(d) Compare vector control and direct torque control of an induction motor 5
2 (a) Choose an application and explain with neat diagrams the multi quadrant 10
operation of an electrical drive. Mention the speed torque conventions in all the
(b) has the following equations for motor torque (T) and load torque (T)). 10
T = -1-2@m; = -3V@m where is the motor speed in rad/s. Obtain the
equilibrium points and determine their steady state stability
3 (a) Derive the thermal model of motor for heating and cooling and draw the heating 10
and cooling curves
(b) Half hour rating of a motor is 200 kW. Heating time constant is 80 min. The 10
maximum efficiency occurs at 75% of full load. Determine the continuous duty
rating of the motor
4 (a) With block diagram explain closed loop speed control with an inner 10
current control loop in an electric drive
(b) Draw the circuit diagram of a four quadrant chopper drive for a DC separately 10
excited motor and explain in detail its operation with necessary diagrams in
forward motoring mode and regenerative braking mode
5 (a) With the speed torque characteristics explain V/f control of induction motor. In 10
the speed torque characteristics, include the region below base speed as well as
(b) 440 volt, 50 hertz, 6 pole star connected induction motor has following 10
parameters referred to stator: Rs Q, Rr =0.6 Q, Xs = 1Q. Stator to rotor
turns ratio is 2. If the motor is used for the regenerative braking, determine
(i) Maximum overhauling torque it can hold and the range of speed in which it
can operate safely
(ii) The speed at which it will hold a load with a load torque of 160 N-m
6 (a) Draw the block diagram and explain in brief the direct torque control of three 10
phase induction motor. What is voltage vector switching table?
(b) What do you mean by vector control or field oriented control of induction motor?
Explain with necessary phasor diagram the working principle of vector control 10
NB: (1) Question No. | is compulsory
(2) Answer any THREE questions out of the remaining FIVE questions
(3) Assume suitable data if necessary and justify them
(4) Figure to the right indicates marks
1 (a) What are the main factors which decide the choice of electrical drive for a given 5
(b) State and explain with neat sketches the three main classes of motor duty cycle 5
(c) With speed torque characteristics, explain the stator voltage control of induction 5
(d) Compare vector control and direct torque control of an induction motor 5
2 (a) Choose an application and explain with neat diagrams the multi quadrant 10
operation of an electrical drive. Mention the speed torque conventions in all the
(b) has the following equations for motor torque (T) and load torque (T)). 10
T = -1-2@m; = -3V@m where is the motor speed in rad/s. Obtain the
equilibrium points and determine their steady state stability
3 (a) Derive the thermal model of motor for heating and cooling and draw the heating 10
and cooling curves
(b) Half hour rating of a motor is 200 kW. Heating time constant is 80 min. The 10
maximum efficiency occurs at 75% of full load. Determine the continuous duty
rating of the motor
4 (a) With block diagram explain closed loop speed control with an inner 10
current control loop in an electric drive
(b) Draw the circuit diagram of a four quadrant chopper drive for a DC separately 10
excited motor and explain in detail its operation with necessary diagrams in
forward motoring mode and regenerative braking mode
5 (a) With the speed torque characteristics explain V/f control of induction motor. In 10
the speed torque characteristics, include the region below base speed as well as
(b) 440 volt, 50 hertz, 6 pole star connected induction motor has following 10
parameters referred to stator: Rs Q, Rr =0.6 Q, Xs = 1Q. Stator to rotor
turns ratio is 2. If the motor is used for the regenerative braking, determine
(i) Maximum overhauling torque it can hold and the range of speed in which it
can operate safely
(ii) The speed at which it will hold a load with a load torque of 160 N-m
6 (a) Draw the block diagram and explain in brief the direct torque control of three 10
phase induction motor. What is voltage vector switching table?
(b) What do you mean by vector control or field oriented control of induction motor?
Explain with necessary phasor diagram the working principle of vector control 10
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