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

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

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

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

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

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

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

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

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

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

The series field of a short-shunt D.C. generator is excited by_______________?

A. External current
B. Armature current
C. Shunt current
D. Load current