Related Questions

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
In a differentially compounded D.C. motor, if shunt field suddenly opens
A The motor will first stop and then run in opposite direction as series motor
B The motor will work as series motor and run at slow speed in the same direction
C The motor will work as series motor and run at high speed in the same direction
D The motor will not work and come to stop
The length of a rectangular field F is 3 km greater than the side of a square field M , and the width of field F is 3 km less then the side of field M. If the area of field M is m2 square km, what is the area of field F?
A m2 +6
B 6
C m2 - 6
D m2 +9
If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then
A it runs at a slower speed
B the motor stops
C it continues to run at the same speed
D it runs at a very high speed
If the field of a D.C. shunt motor gets opened while motor is running
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 run at constant speed
Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?
A 1 hour
B 2 hours
C 3 hours
D 4 hours
E 5 hours
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a
A D-slide valve
B governor
C Meyer’s expansion valve
D flywheel
The speed of a DC shunt motor is required to be more than full load speed . This is possible by-
A reducing the field current
B decreasing the armature current
C increasing the armature current
D None of the above
The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by
A Reducing the field current
B Decreasing the armature current
C Increasing the armature current
D Increasing the excitation current
The speed of a D.C. shunt motor more than its full-load speed can be obtained by
A Decreasing the field current
B Increasing the field current
C Decreasing the armature current
D Increasing the armature current

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