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
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
In which of the following applications D.C. series motor is invariably tried?
(A) Starter for a car
(B) Drive for a water pump
(C) Fan motor
(D) Motor operation in
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
(A) Frame
(B) Shaft
(C) Commutator
(D) Stator
In case of conductively compensated D.C. series motors, the compensating winding is provided______________?
(A) as separately wound unit
(B) in parallel with armature winding
(C) in series with armature winding
(D) in parallel with field winding
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
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
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?
(A) nothing will happen to the motor
(B) this will make armature to take heavy current, possibly burning it
(C) this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
(D) motor will run at very slow speed
Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
(A) Series motor
(B) Shunt motor
(C) Cumulatively compounded motor
(D) Differentially compounded motor
Which D.C. motor has got maximum self loading property?
(A) Series motor
(B) Shunt motor
(C) Cumulatively compounded ‘motor
(D) Differentially compounded motor