Related Questions

If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to
A reverse the field connections
B increase the field resistance
C increase the speed of primemover
D check armature insulation resistance
A 18-year-old patient presented with hypertension and recurrent weakness of all four limbs. His serum Na+ 140 mmol/L, serum K+ 2.6 mmol/L, serum HC03" 30 mmol/L. Probable cause/s is/are
A Cushing’s syndrome
B Conn’s syndrome
C Bartter’s syndrome
D Diarrhea
E Enterocutaneous fistula
It is probable that the prototype cellular motor might be ready for testing around the end of next year. Which of the following could replace the underlined portion of the sentence with best fit?
A might be ready for testing around the end of the next year
B may be ready for testing about the end of next year
C might be ready for testing toward next year’s end
D may be ready for testing at the end of year ahead
4 men can build a small house in 12 days. How long would it take for 6 men to build the same house?
A 9 days
B 8 days
C 8.1 days
D 8.2 days
In a shunt generator the voltage build up is generally restricted by
A speed limitation
B armature heating
C insulation restrictions
D saturation of iron
Following D.C. generator will be in a position to build up without any residual magnetism in the poles
A Series generator
B Shunt generator
C Compound generator
D Self-excited generator
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 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 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

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