Related Questions

The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator?
A Hysteresis loss
B Field copper loss
C Armature copper loss
D Eddy current loss
By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
A Radiation
B Convection
C Conduction
D All of the above
The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
A conduction
B convection
C radiation
D any of the above
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator?
A Dummy coils
B Commutator
C Eye bolt
D Equalizer rings
The e.m.f. generated by a shunt wound D.C. generator is E. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
A $$\frac{{\text{E}}}{2}$$
B 2E
C Slightly less than E
D E
A separately excited generator as compared to a self-excited generator
A Is amenable to better voltage control
B Is more stable
C Has exciting current independent of load current
D Has all above features
Which of the following losses is not dissipated by the stator core surface in a synchronous motor ?
A Eddy current losses in the conductors
B Iron losses in the stator
C Copper losses in the slot portion of the conductors
D Windage losses
The process through which excess of light energy is dissipated in photosynthesis is known as
A scavenging
B photolysis
C photophosphorylation
D quenching
The power dissipated in a pure capacitor is
A zero
B proportional to applied voltage
C proportional to value of capacitance
D both (B) and (C) above

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