181. The main disadvantage(s) of the Ward-leonard system is
- high initial cost
- poor overall efficiency
- high maintenance cost
- all of the above
182. For the given torque, reducing diverter resistance of a dc series motor
- increases its speed but armature current remains the same
- increases its speed demanding more armature current
- decreases its speed demanding less armature current.
- decreases its speed but armature current remains the same
183. If the additional resistance is connected in a series with a dc series motor operating at rated speed, the speed of the motor will
- reduce
- increase
- remain unaltered
- oscillate around the normal speed
184. If a resistance is connected across the armature of a dc series motor, its speed for a constant load torque will
- increase
- decrease
- remains unaltered
- become zero
185. Field divertor method of speed control of a dc series motor gives speeds above rated one due to reduction of
- field current
- armature current
- line current
- none of these
186. A dc series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will
- decrease
- increase
- become excessively high
- remain unaltered
187. Two dc series motor are connected in series and are driving the same mechanical load. If the motors are now connected in parallel, the speed will become
- one fourth
- half
- double
- 4-times
188. In series-parallel control of dc series motor, the torque produced in series arrangement will be _________ of that in parallel arrangement
- double
- four times
- half
- one fourth
189. The speed of a cumulatively compounded dc motor can be controlled by varying
- armature voltage
- armature resistance
- shunt field resistance
- any of the above
190. The function of the field regulator in a dc compound motor is to
- limit the armature current
- vary the armature resistance
- control the field current
- none of the above
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