Related Questions

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens
A This will make armature to take heavy current, possibly burning it
B This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
C Nothing will happen to motor
D Motor will come to stop
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
D.C. shunt motors are used for driving
A Trains
B Cranes
C Hoists
D Machine tools
In D.C. shunt motors as load is reduced
A The speed will increase abruptly
B The speed will increase in proportion to reduction in load
C The speed will remain almost/constant
D The speed will reduce
Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
A person goes from point N to P and comes back. His average speed for the whole journey is 60 km/hr. If his speed while going from N to P is 40 km/hr, then what will be the speed of the person (in km/hr) while coming back from P to N?
A 80
B 100
C 120
D 140
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will
A Increase
B Decrease
C Remain same
D Become zero
A delivery car went from Candleford to Lark Rise and back at an average speed of23 miles per hour. If the distance from Candleford to Lark Rise is 1 mile, and the trip back too half as much time as the trip there, what was the average speed of the delivery car on the way to Lark Rise?
A 13
B 34
C 12
D 23
A delivery cart went from Candle ford to Lark Rise and back at an average speed of 2/3 miles per hour. If the distance from Candle ford to Lark Rise is 1 mile, and the trip back took half as much time as the trip there, what was the average speed of the delivery cart on the way to Lark Rise?
A 1/3
B 3/4
C 1/2
D 2/3
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

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