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(a) The advantages of a group driver electric drive are
(i) high efficiency (ii) low noise (iii) constant speed (iv) All of the above.
(b) Which of the following electrical braking systems is preferred in industries?
(i) Plugging braking (ii) Dynamic braking (iIi) Regenerative braking (iv) None of the above
(c) Which of the following types of electric drive is used in cranes?
(i) Individual (ii) Multimotor (iii) Group (iv) None of the above
(d) The starting torque of a d.c. motor is independent of which of the following?
(i) Flux (ii) Speed (iii) Armature current ( iv) Flux and armature current
(e) If the current in the armature of d.c series motor is reduced to 5%, the torque of the motor will become
(i) 50% of the previous value (ii) 100% of the previous value (iii) 150% of the previous value (iv) 25% of the previous value
(f) Which speed control method preferred for constant torque drive?
(1) Field control (ii) Mechanical loading system (iii) Armature voltage control (iv) None of the above
(g) A step-down chopper can be used in
(i) electric traction (ii) electric vehicles (iii) machine tools (iv) All of the above
(h) A d.e. chopper circuit connected to a 100 V d.c. source supplies an inductive load having 40 mH in series with a resistance of 50. A freewheeling diode is placed across the load. The load current varies between the limits of 10 A and 12 A. The time ratio (Ton/T off) of the chopper is
(i) 1.68 (ii) 0.98 (iii) 1-22 (iv) 0.75
(i) In an induction motor, when the number of stator slots is equal to an integral number of rotor slots
(i) there may be a discontinuity in torque slip characteristics (ii) a high starting torque will be available (iii) the maximum torque will be high (iv) the machine may fail to start
(j) Induction motor is also known as
(i) frequency changer
(ii) frequency remover
(iii) time period remover
(iv) d.c. machine
ALL in one BEU PYQ solution pdf is provided below
2 (a) Draw the power circuit arrangement of three-phase variable frequency inverter for the speed control of three-phase induction working. motor and explain its
(b) A 500 V series motor having armature resistance and field resistance of 0-2 and 0-3 respectively runs at 500 rpm when taking 70 A. Assuming unsaturated field, find out its speed when field diverter of 0-684 2 is used as constant load torque.
3. (a) Explain the control of d.c. drives using rectifiers and choppers.
(b) Discuss the speed control of a.c. motors by using three-phase a.c. voltage regulators.
7 (a) Explain in detail about various methods of solid-state speed control techniques by using inverters.
(b) Explain the field control methods used for d.c. series motor for speed control.
8. possible in d.c. series motor? (a) Explain the speed of induction motor from rotor side. b) Why is the regenerative braking not
(c) How is the speed control of the d.c. drive achieved using fully controlled rectifier?
9 (a) Define continuous duty of a motor. (b) Mention four types of mechanical load.
(c) What are various functions performed by an electric drive?
(d) What are different types of electric braking?
(e) What are the disadvantages of inserting resistance in the rotor circuit in slip ring induction motor?
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