Electric Machines Mega Quiz 27
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Which D.C. motor is preferred for elevators ?
A (a) Shunt motor
B (b) Series motor
C (c) Differential compound motor
D (d) Cumulative compound motor
According to Fleming's left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of
A (a) current in the conductor
B (b) direction of conductor
C (c) resultant force on conductor
D (d) none of the above
If the field of a D.C. shunt motor gets opened while motor is running
A (a) the speed of motor will be reduced
B (b) the armature current will reduce
C (c) the motor will attain dangerously high speed
D (d) the motor will continue to run at constant speed
Starters are used with D.C. motors because
A (a) these motors have high starting torque
B (b) these motors are not self-starting
C (c) back e.m.f. of these motors is zero initially
D (d) to restrict armature current as there is no back e.m.f. while starting
In D.C. shunt motors as load is reduced
A (a) the speed will increase abruptly
B (b) the speed will increase in proportion to reduction in load
C (c) the speed will remain almost constant
D (d) the speed will reduce
392 attempts 3 upvotes 19 comments Jul 4 ESE & GATE EE
