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.Management Sciences
Category: D.C. Motors
With the increase in temperature, the speed of DC shunt motor____________?
A. decreases.
B. increases
C. remain same
D. none of the above
If a D.C. motor is connected across the A.C. supply it will_______________?
A. run at normal speed
B. not run
C. run at lower speed
D. burn due to heat produced in the field winding by .eddy currents
In D.C. shunt motors as load is reduced__________________?
A. the speed will increase abruptly
B. the speed will increase in proportion to reduction in load
C. the speed will remain almost/constant
D. the speed will reduce
The purpose of retardation test on D.C. shunt machines is to find out____________?
A. stray losses
B. eddy current losses
C. field copper losses
D. windage losses
For starting a D.C. motor a starter is required because___________?
A. it limits the speed of the motor
B. it limits the starting current to a safe value
C. it starts the motor
D. none of the above
The armature voltage control of D.C. motor provides_____________?
A. constant voltage drive
B. constant current drive
C. constant torque drive
D. none of the above
If the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?
A. increase in armature current
B. increase in flux
C. decrease in reactance
D. decrease in back emf
In a D.C. generator, the iron losses mainly take place in___________/
A. yoke
B. commutator
C. armature conductors
D. armature rotor
Kingdom Protoctista includes_______________?
A. Prokaryotic organisms
B. Unicellular organisms
C. Fungi
D. Eu-cariotiquic organisms
The armature voltage control of D.C. motor provides____________?
A. constant torque drive
B. constant voltage drive
C. constant current drive
D. none of the above
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