A. up to 5 H.P
B. up to 10 H.P
C. up to 15 H.P
D. up to 20 H.P
Related Mcqs:
- 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 - A three point starter is considered suitable for______________?
A. shunt motors
B. shunt as well as compound motors
C. shunt, compound and series motors
D. all D.C. motors - Three point starter can be used for______________?
A. series motor only
B. shunt motor only
C. compound motor only
D. both shunt and compound motor - In a manual shunt motor starter?
A. over load relay is connected in series and no volt relay in parallel with the load
B. over load relay is connected in parallel and no volt relay in series with the load
C. over load relay and no volt relay are both connected in series with the load
D. over load relay and no volt relay are both connected in parallel with the load - Which of the following application requires high starting torque ?
A. Lathe machine
B. Centrifugal pump
C. Locomotive
D. Air blower - The ratio of starting torque to full-load torque is least in case of____________?
A. series motors
B. shunt motors
C. compound motors
D. none of the above - For the same H.P. rating and full load speed, following motor has poor starting torque_____________?
A. shunt
B. series
C. differentially compounded
D. cumulativelyc’ompounded - Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?
A. D.C. series motor
B. D.C. shunt motor
C. induction motor
D. all of above motors - As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit____________________?
A. a resistance is connected in series with armature
B. a resistance is connected parallel to the armature
C. armature is temporarily open circuited
D. a high value resistor is connected across the field winding - Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control______________?
A. drum type controller is used
B. three point starter is used
C. four point starter is used
D. all above can be used
