A. 20 to 30 m/s
B. 10 to 15 m/s
C. 5 to 10 m/s
D. 1 to 2.5 m/s
Correct Answer: 1 to 2.5 m/s ✔
Last Updated: July 30, 2021
Related MCQs
- Belted slip ring induction motor is almost invariably used for__________?
- The cost of an induction motor will increase as__________?
- While selecting motor for an air conditioner which of the following characteristics is of great importance ?
- Which of the following alternatives will be cheaper ?
- Which of the following motors has series characteristics ?
- For a D.C. shunt motor which of the following is incorrect ?
- Which of the following types of motor enclosure is safest ?
- The diameter of the rotor shaft for an electric motor depends on which of the following ?
- In series motor which of the following methods can be used for changing the flux per pole ?
- For which of the following applications motor has to start with high acceleration ?
- Which of the following happens when star-delta starter is used ?
- Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?
- Which of the following motors is preferred for boom hoist of a travelling crane ?
- The capacity of a crane is expressed in terms of__________?
- Which of the following motors is preferred when quick speed reversal is the main consideration ?
- A pony motor is used for the starting which of the following motors ?
- Besides a constant speed a synchronous rotor possesses which of the following advantages ?
- For crane travel which of the following motors is normally used ?
- The characteristics of drive for crane hoisting and lowering are which of the following ?
- A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is__________?
- By the use of which of the following m D.C. can be obtained from AC. ?
- Heavy duty cranes are used in__________?
- In __________ the speed can be varied by changing the position of brushes?
- For a motor-generator set which of the following motors will be preferred ?
- In __________ method of staging three phase induction motors the starting voltage is not reduced?
- Battery operated scooter for braking uses__________?
- In which of the following applications variable speed operation is preferred ?
- __________has the least value of starting torque to full load torque ratio?
- Battery operated scooter for braking uses__________?
- Which of the following machines has heavy fluctuation of load ?
- In which of the following applications the load on motor changes in cyclic order ?
- For derries and winches which of the following drives can be used ?
- In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible?
- __________has least range of speed control?
- Flame proof motors are used in__________?
- In squirrel cage induction motors which of the following methods of starting cannot be used ?
- Heat control switches are used in__________?
- In jaw crushers a motor has to often start against __________ load?
- Which of the following motors is usually preferred for kiln drives ?
- __________ has relatively wider range of speed control?
- Rotor of a motor is usually supported on __________ bearings?
- The size of an excavator is usually expressed in terms of__________?
- __________method of starting a three phase induction motor needs six terminals ?
- Which of the following is essentially needed while selecting a motor ?
- In a paper mill where constant speed is required__________?
- For blowers which of the following motor is preferred ?
- Reluctance motor is a__________?
- A reluctance motor__________?
- __________is preferred for synthetic fibre mills?
- Which of the following motors is used for elevators ?
- __________ motor is a constant speed motor?