Monday, 29 October 2012

Industrial Drives Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    The selection of an electric motor for any application depends on which of the following factors ?
(a)    Electrical characteristics
(b)    Mechanical characteristics
(c)    Size and rating of motors
(d)    Cost
(e)    All of the above
Ans: e

2.    For a particular application the type of electric-and control gear are determined by which of the following considerations ?
(a)    Starting torque
(b)    Conditions of environment
(c)    Limitation on starting current
(d)    Speed control range and its nature
(e)    All of the above
Ans: e

3.    Which ofthefollowingmotors is preferred for traction work ?
(a)     Universal motor
(b)     D.C. series motor
(c)    Synchronous motor
(d)    Three-phase induction motor

4   Which of the following motors always starts on load ?
(a)     Conveyor motor
(b)     Floor mill motor
(c)    Fan motor
(d)    All of the above
Ans: d

5    is preferred for automatic drives.
(a)     Squirrel cage induction motor
(b)     Synchronous motors
(c)    Ward-Leonard controlled D.C. motors
(d)    Any of the above
Ans: c

6. When the load is above _____ a synchronous motor is found to be more economical.
(a)     2 kW   
(b)     20 kW
(c)     50 kW   
(d)     100 kW
 Ans: d

7.    The load cycle for a motor driving a power press will be   
(a)     variable load
(b)     continuous
(c)    continuous but periodical
(d)    intermittent and variable load
Ans: d

8.    Light duty cranes are used in which of the following ?
(a)     Power houses
(b)     Pumping stations
(c)    Automobile workshops
(d)    All of the above
Ans: d

9.    While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?
(a)    Running characteristics
(b)    Starting characteristics
(c)    Efficiency
(d)    Braking
Ans: d

10.   Which of the following motors are pre-ferred for overhead travelling cranes ?
(a)    Slow speed motors
(b)    Continuous duty motors
(c)    Short time rated motors
(d)    None of the above
Ans: c

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