1181.
Which of the following tests will be suitable for testing two similar D.C. series motorsof large capacity ?
A
Swinburnes test
B
Hopkinsons test
C
Field test
D
Brake test
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Which of the following tests will be suitable for testing two similar D.C. series motorsof large capacity ?
Swinburnes test
Hopkinsons test
Field test
Brake test
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
Providing laminations in armature core
Providing laminations in stator
Using non-magnetic material for frame
Using material of low hysteresis co-efficient for armature core material
Which of the following motors one will choose to drive the rotary compressor ?
D.C. shunt motor
D.C. series motor
Universal motor
Synchronous motor
Which of the following motors is usually used in house-hold refrigerators ?
D.C. shunt motor
D.C. series motor
Single phase induction motor (split phase start or induction run motor)
Reluctance motor
Which of the following motors is most suitable for signalling devices and many kinds of timers ?
D.C. shunt motor
D.C. series motor
Induction motor
Reluctance motor
Which of the following motor is preferred for operation in highly explosive atmosphere ?
Series motor
Shunt motor
Air motor
Battery operated motor
Which of the following motor has the poorest speed regulation ?
Shunt motor
Series motor
Differential compound motor
Cumulative compound motor
Which of the following method of speed control of D.C. machine will offer minimum efficiency ?
Voltage control method
Field control method
Armature control method
All above methods
Which of the following losses are significantly reduced by laminating the core of aD.C. generator ?
Hysteresis losses
Eddy current losses
Copper losses
Windage losses
Which of the following loss in a D.C. generator varies significantly with the load current ?
Field copper loss
Windage loss
Armature copper loss
None of the above
Which of the following loss in a D.C. generator is dissipated in the form of heat?
Mechanical loss
Core loss
Copper loss
All of the above
Which of the following load normally needs starting torque more than the rated torque?
Blowers
Conveyors
Air compressors
Centrifugal pumps
Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
Lenzs law
Faradays law
Coloumbs law
Flemings left-hand rule
Which of the following application requires high starting torque ?
Lathe machine
Centrifugal pump
Locomotive
Air blower
Which motor should not be started on no-load ?
Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor.
Which motor has the poorest speed control?
Differentially compounded motor
Cumulatively compounded motor
Shunt motor
Series motor
Which method of braking is generally used in elevators ?
Plugging
Regenerative braking
Rheostatic braking
None of the above
Which D.C. motor will be suitable alongwith flywheel for intermittent light and heavy loads?
Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor
Which D.C. motor will be preferred for machine tools ?
Series motor
Shunt motor
Cumulative compound motor
Differential compound motor
Which D.C. motor is preferred for elevators ?
Shunt motor
Series motor
Differential compound motor
Cumulative compound motor