Computer Programming MCQs

5739 MCQs (Page 59 of 574)

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As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately______________?

A. 40 percent
B. 25 percent
C. 10 percent
D. 5 percent

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Shunt generators are most suited for stable parallel operation because of their______________?

A. Rising voltage characteristics
B. Identical voltage characteristics
C. Drooping voltage characteristics
D. Linear voltage characteristics

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The main factor which leads to unstable parallel operation of flat and over compounded generators is_____________?

A. Their rising voltage characteristics
B. Unequal number of turns in their series field windings
C. Unequal speed regulation of their primemovers
D. Unequal series field resistances

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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

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When two D.C. generators are running in parallel an equilizer bar is used______________?

A. To increase the series flux
B. To increase the generated e.m.f.
C. To reduce the combined effect of ar-mature reaction of both the machines
D. So that the two identical machines will pass approximately equal cur¬rents to the load

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The essential condition for parallel operation of two D.C. generators is that they have ________________?

A. Same kw rating
B. The same operation r.p.m.
C. The same drooping voltage characteristics
D. Same percentage regulation

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Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?

A. 270 v
B. 267.5 v
C. 265 v
D. 257.4 v

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With a D.C. generator which of the following regulation is preferred ?

A. 100% regulation
B. Infinite regulation
C. 50% regulation
D. 1% regulation

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The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?

A. Will be less than 250 v
B. Will always be 250 v
C. May be greater or less than 250 v
D. None of the above

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Which of the following component is usually fabricated out of silicon steel ?

A. Bearings
B. Shaft
C. Statorcore
D. None of the above

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