Q.1
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
Q.2
________ has the least value of starting torque to full load torque ratio.
Q.3
The starting torque in case of centrifugal pumps is generally
Q.4
In which of the following applications the load on motor changes in cyclic order?
Q.5
For which of the following applications motor has to start with high acceleration?
Q.6
Flame proof motors are used in
Q.7
Which of the following machines has heavy fluctuation of load?
Q.8
By the use of which of the following D.C. can be obtained from AC.?
Q.9
Which of the following is essentially needed while selecting a motor?
Q.10
Is preferred for synthetic fibre mills.
Q.11
A pony motor is used for the starting which of the following motors?
Q.12
In series motor which of the following methods can be used for changing the flux per pole?
Q.13
Short time rated motors are preferred for overhead traveling cranes
Q.14
Reluctance motor is a
Q.15
Light duty cranes are used in which of the following?
Q.16
The diameter of the rotor shaft for an electric motor depends on which of the following?
Q.17
The load cycle for a motor driving a power press will be
Q.18
Which of the following motors is used for elevators?
Q.19
Which of the following types of motor enclosure is safest?
Q.20
In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible,
Q.21
Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?
Q.22
The selection of an electric motor for any application depends on which of the following factors?
Q.23
Ward-Leonard controlled D.C. drives are generally used for _________ excavators.
Q.24
A reluctance motor
Q.25
Which feature, while selecting a motor for centrifugal pump, will be of least significance?
Q.26
While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?
Q.27
Rotor of a motor is usually supported on _________ bearings.
Q.28
When the load is above _________ a synchronous motor is found to be more economical.
Q.29
In jaw crushers a motor has to often start against ________ load.
Q.30
For which of the following applications D.C. motors are still preferred?
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