For a D.C. machines laboratory following type of D.C. supply will be suitable___________?

Byadmin July 5, 2018August 11, 2021

For a D.C. machines laboratory following type of D.C. supply will be suitable___________?

A. rotary converter
B. mercury are rectifier
C. induction motor D.C. generator set
D. synchronous motor D.C. generator set

D.C. Generators

In D.C. generators the polarity of the interpoles_____________?

In D.C. generators the polarity of the interpoles_____________?

A. is the same as that of the main pole ahead
B. is the same as that of the immediately preceding pole
C. is opposite to that of the main pole ahead
D. is neutral as these poles do not play part in generating e.m.f.

Read More In D.C. generators the polarity of the interpoles_____________?
D.C. Generators

In a D.C. generator the critical resistance refers to the resistance of_____________?

In a D.C. generator the critical resistance refers to the resistance of_____________?

A. brushes
B. field
C. armature
D. load

Read More In a D.C. generator the critical resistance refers to the resistance of_____________?
D.C. Generators

Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.

Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.

A. Series field
B. Compensating field
C. Inter pole field
D. Shunt field

Read More Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.
D.C. Generators

If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?

If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?

A. demagnetisation only
B. cross magnetisation as well as mag¬netisation
C. crossmagnetisation as well as demagnetising
D. cross magnetisation only

Read More If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?
D.C. Generators

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

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

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

Which of the following generator will have negligible terminal voltage while running on no-load?

Which of the following generator will have negligible terminal voltage while running on no-load?

A. Series generator
B. Shunt generator
C. Compound generator
D. Separately excited generator

Read More Which of the following generator will have negligible terminal voltage while running on no-load?

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