According to Fleming’s left-hand rule when the forefinger points in the direction of the field or flux the middle finger will point in the direction of
current in the conductor aovtaat of conductor
none of the above
resultant force on conductor
Series motor
current in the conductor aovtaat of conductor
If the field of a D.C. shunt motor gets opened while motor is running
the motor will attain dangerously high speed 1
the armature current will reduce
the speed of motor will be reduced %
the motor will continue to nuvat constant speed
the motor will attain dangerously high speed 1
In D.C. shunt motors as load is reduced
the speed will reduce
the speed will remain almost/constant
the speed will increase abruptly
the speed will increase in proportion to reduction in load
the speed will remain almost/constant
For starting a D.C. motor a starter is required because
it limits the starting current to a safe value
it limits the speed of the motor
it starts the motor
none of the above
it limits the starting current to a safe value
The type of D.C. motor used for shears and punches is
differential compound D.C. motor
series motor
shunt motor
cumulative compound D.C. motor
cumulative compound D.C. motor
To get the speed of D.C motor below the normal without wastage of electrical energy is used.
rheostatic control
any of the above method
Ward Leonard control
none of the above method
Ward Leonard control
can be obtained by
decreasing the field current
increasing the armature current
decreasing the armature current
increasing the field current
decreasing the field current
A direct on line starter is used: for starting motors
up to 5 H.P.
up to 15 H.P.
up to 10 H.P.
up to 20 H.P.
up to 5 H.P.
In which of the following applications D.C. series motor is invariably tried?
Motor operation in A.C. or D.C.
Starter for a car
Drive for a water pump
Fan motor
Starter for a car
A three point starter is considered suitable for
shunt as well as compound motors
shunt motors
shunt compound and series motors
all D.C. motors
shunt as well as compound motors
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