A. as separately wound unit
B. in parallel with armature winding
C. in series with armature winding
D. in parallel with field winding
Related Mcqs:
- When two D.C. series motors are connected in parallel, the resultant speed is____________?
A. more than the normal speed
B. loss than the normal speed
C. normal speed
D. zero - D.C. series motors are used______________?
A. where load is constant
B. where load changes frequently
C. where constant operating speed is needed
D. in none of the above situations - Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity ?
A. Swinburne’s test
B. Hopkinson’s test
C. Field test
D. Brake test - In case of D.C. shunt motors the speed is dependent on back e.m.f. only because____________?
A. back e.m.f. is equal to armature drop
B. armature drop is negligible
C. flux is proportional to armature current
D. flux is practically constant in D:C. shunt motors - In D.C. machines fractional pitch winding is used__________?
A. to improve cooling
B. to reduce copper losses
C. to increase the generated e.m.f.
D. to reduce the sparking - If the field winding resistance of a DC shunt motor is increases, its speed will____________?
If the field winding resistance of a DC shunt motor is increases, its speed will
A. decreases
B. increases
C. remains same
D. none of the above - In a DC motor the inter-pole winding is connected in________________?
A. series with field winding
B. series speed armature winding
C. parallel big field winding
D. parallel with armature winding - Why are the D.C. motors preferred for traction applications ?
A. Torque and speed are inversely proportional to armature current
B. Torque is proportional to armature current
C. Torque is proportional to square root of armature current
D. The speed is inversely proportional to the torque and the torque is proportional to square of armature current - Which of the following motors is usually used in house-hold refrigerators ?
A. D.C. shunt motor
B. D.C. series motor
C. Single phase induction motor (split phase start or induction run motor)
D. Reluctance motor
E. Synchronous motor - D.C. shunt motors are used for driving____________?
A. trains
B. cranes
C. hoists
D. machine tools
