101. The type of dc generator used for arc welding purpose is a
- series generator
- shunt generator
- cumulatively compounded generator
- differentially compounded generator
102. When two dc series generators are operating in parallel, an equalizer bar is used
- to reduce armature reaction
- to increase emf
- to increase the speed
- to reduce the flux
- so that the two similar machines take approximately equal load current
103. The simplest way of shifting load from one shunt generator to the other operating in parallel is by
- adjustment of speeds
- adjustment of armature resistance
- adjustment of field rheostats
- using equalizer connections
104. If field of one of two generators operating in parallel is made very weak, then it will
- not take any load
- take major share of load
- operate as a motor and run in the same direction
- operate as a motor and run in the opposite direction
105. DC generators are connected to or disconnected from the busbar only under the floating condition. This is done to avoid
- burning of switch contacts
- sudden loading of the prime mover
- mechanical jerk to the shaft
- all of the above
106. For parallel operation, the dc generators normally preferred are
- shunt
- over-compound
- under compound
- both shunt and under compound
107. Equalizer bar is necessary for parallel operation of dc ________ Generators.
- series
- over-compound
- under compound
- series and over compound
108. In the block diagram of a separately excited dc motor, how does the armature induced emf appear as?
- positive feedback
- negative feedback
- disturbance input
- output
109. In the dc motor, energy conversion would not have been possible but for
- input energy from the supply
- production of back emf in the armature
- use of commutator
- rotation of the machine
110. With the increase in speed of a dc motor
- both back emf as well as line current increase
- both back emf as well as line current fall
- back emf increases but line current falls
- back emf falls and line current increases
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