A. the speed of motor will be reduced %
B. the armature current will reduce
C. the motor will attain dangerously high speed 1
D. the motor will continue to nuvat constant speed
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Starters are used with D.C. motors because______________?
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In D.C. shunt motors as load is reduced__________________?
A. these motors have high starting torque
B. these motors are not self-starting
C. back e.m.f. of these motors is zero initially
D. to restrict armature current as there is no back e.m.f. while starting
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A D.C. series motor is that which______________?
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
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For starting a D.C. motor a starter is required because___________?
A. has its field winding consisting of thick wire and less turns
B. has a poor torque
C. can be started easily without load
D. has almost constant speed
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The type of D.C. motor used for shears and punches is_____________?
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
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If a D.C. motor is connected across the A.C. supply it will_______________?
A. shunt motor
B. series motor
C. differential compoutid D.C. motor
D. cumulative compound D.C. motor
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To get the speed of D.C, motor below the normal without wastage of electrical energy is used?
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
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When two D.C. series motors are connected in parallel, the resultant speed is____________?
A. Ward Leonard control
B. rheostatic control
C. any of the above method
D. none of the above method
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The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?
A. more than the normal speed
B. loss than the normal speed
C. normal speed
D. zero