20. As load is added to an induction motor... A) Speed will ... a) increase b) decrease c) remain the same B) Rotor current will ... a) increase b) decrease c) remain the same C) Torque will ... a) increase b) decrease c) remain the same

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

20. As load is added to an induction motor...
A) Speed will ...
a) increase b) decrease c) remain the same
B) Rotor current will ...
a) increase b) decrease c) remain the same
C) Torque will ...
a) increase b) decrease c) remain the same
D) How is the motor able to adjust its stator current with changes in mechanical load?
a) counter emf of the stator will increase therefore stator current will increase
b) counter emf of the stator will decrease therefore stator current will increase
c) counter emf of the stator will increase therefore stator current will decrease
d) none of the above

Branch of science that deals with the stationary and moving bodies under the influence of forces.

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20. As load is added to an induction motor... A) Speed will ... a) increase b) decrease c) remain the same B) Rotor current will ... a) increase b) decrease c) remain the same C) Torque will ... a) increase b) decrease c) remain the same D) How is the motor able to adjust its stator current with changes in mechanical load? a) counter emf of the stator will increase therefore stator current will increase b) counter emf of the stator will decrease therefore stator current will increase c) counter emf of the stator will increase therefore stator current will decrease d) none of the above
L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no
I need the answer as soon as possible
B/ Fill in the blanks: TV ezur 1- In a three-phase induction motor iron losses in stator will be..... that in rotor. 2- In three-phase induction motors sometimes copper bars are placed deep in the rotor to........... 3- Blocked rotor test on induction motors is used to find out. R..., ke, X. 4- The maximum torque in an induction motor depends on .............and .....
d) A 2-pole induction motor is fed with a 230 V, 50 Hz supply and is running at no load. i. Calculate its angular speed in rpm. ii. Explain how can we slow down the speed of the motor above, at no load? iii. Explain what will happen to the speed of the motor if we slowly add amechanical load to the motor.
pole. 50-Hz. 3-ϕ induction motor has a full-load speed of 950 rpm. At half load its speed would be ..... rpm a) 475 b) 500 c) 975 d)1000
23. As load is increased from no load to full load on a 3-phase squirrel-cage induction motor, what happens to the ... A) slip of the motor? a) increases b) decreases c) remains the same d) none of the above B) speed of the motor? a) increases b) decreases c) remains the same d) none of the above C) torque of the motor? a) increases b) decreases c) remains the same d) none of the above D) stator current of the motor? a) increases b) decreases c) remains the same d) none of the above
A three –phase, 440V, 50 Hz, 6 – pole induction motor running at 950 rpm takes 50 kW at certain load. The friction and windage loss is 1.5 kW and the stator losses = 1.2 kW. Determine the output from the rotor. (a). 42.68 kW (b). 46.48 kW (c). 48.80 kW (d). 44. 86 kW
7- A 6-pole, 50-Hz, 3-0 induction motor is running at 950 rpm and has rotor Cu loss of 6 kW. Its rotor input is......kW (a) 120 (b) 60 (c) 6.3 (d) 66 8- The number of slip rings on a squirrel cage induction motor is usually (a)Two (b) Three (c) Four (d) None
1- To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be....... a) Reduced by 10%, b) Reduced by 20%, c) Increased by 10%, d) Increased by 20% 2. When maximum starting torqua ic ohtoinod
a) Briefly explain basic operating principle of an induction motor.
Q.14. What is slip in an induction motor? Q.15. What is the value of slip at start in an induction motor?