141. The dc series motor is best suited for driving
- line shafting, blowers and fans
- machine tools
- shear and punches
- cranes and hoists
142. Dc series motor is best suited for electric traction as
- it develops high starting torque
- it runs at very high speed at light load
- it is cheaper in cost
- it consumes less power
143. A dc series motor is running at rated speed without any additional resistance in series. If an additional resistance is placed in series, the speed of motor
- increases
- decreases
- remains unchanged
- oscillates around the rated speed
144. A dc series motor is used for an overhauling load. It can work stably if
- the armature is shunted by a resistor
- the field winding is reversed
- a resistor is put in series with the machine
- a divertor is put across the field
145. A dc shunt motor is driving a constant torque load. On inserting an additional resistance in the armature circuit, the speed of the motor will be
- remain unchanged
- increases
- decreases
- be zero
146. A dc shunt motor may have rising speed-torque characteristic due to
- very high armature circuit resistance
- very high field circuit resistance
- very high demagnetizing armature reaction
- very low demagnetizing armature reaction
147. If the speed of the dc motor increases with the load torque, then it is a
- series motor
- permanent magnet
- differentially compounded motor
- cumulatively compounded motor
148. In a dc motor, if the armature current is increased, keeping field current constant, the torque developed will
- remain unchanged
- decrease in inverse proportion
- increase proportionately
- increase in proportion to the square of the armature current
149. A dc shunt motor is driving a constant torque load with normal excitation. If the field current is halved then the motor will run at
- rated speed
- half rated speed
- double of rated speed
- slightly less than double the rated speed
150. Dc shunt motors are used for driving
- machine tools and lathes
- centrifugal pumps, blowers and fans
- line shafts
- all of these
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