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In a D.C. generator the critical resistance refers to the resistance of_____________?
Related MCQs
A series generator can self-excite:__________?
A D.C. generator works on the principle of__________?
The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage__________?
The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A, the terminal voltage will be__________?
A shunt generator can self-excite:__________?
With a D.C. generator which of the following regulation is preferred ?
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__________?
The essential condition for parallel operation of two D.C. generators is that they have __________?
When two D.C. generators are running in parallel an equilizer bar is used__________?
Two generators are running in parallel. One of the generators may run as motor for which of the following reasons ?
Which of the following generators will be preferred if they are required to be run in parallel?
Which of the following generating machine will offer constant voltage on all loads?
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__________?
The main factor which leads to unstable parallel operation of flat and over compounded generators is__________?
When two D.C. series generators are running in parallel, an equilizer bar is used__________?
Shunt generators are most suited for stable parallel operation because of their__________?
As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately__________?
The critical resistance of the D.C. generator is the resistance of__________?
The series field of a short-shunt D.C. generator is excited by__________?
In a separately excited generator supplying rated load the armature reaction.
For both lap and wave windings, there are as many commutator bars as the number of__________?
Wave winding is composed of__________?
The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is__________?
In a D.C. generator:__________?
In a D.C. generator the critical resistance can be increased by__________?
Which generator would you prefer for feeding long D.C. transmission lines ?
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.
Armature reaction in a generator results in__________?
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be__________?
The purpose of providing dummy coils in a generator is__________?
A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be__________?
A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly__________?
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will__________?
The purpose of providing dummy coils in a generator is__________?
In D.C. generators on no-load, the air gap flux distribution in space is__________?
The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:__________?
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except__________?
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when__________?
In a level compounded D.C. generator, full load terminal voltage is__________?
The e.m.f. generated in a D.C. generator is directly proportional to__________?
In D.C. generators the polarity of the interpoles__________?
In over compounded generator, full load terminal voltage is__________?
Permeance is the reciprocal of__________?
Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?
Which of the following generator will have negligible terminal voltage while running on no-load?
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when__________?
D.C. generator generally preferred for charging automobile batteries is__________?
In case of a flat compounded generator:
Interpole flux should be sufficient to__________?
Following D.C. generator will be in a position to build up without any residual magnetism in the poles__________?
An exciter for a turbo generator is a__________?
In a D.C. generator the critical resistance refers to the resistance of_____________?
A. brushes
B. field
C. armature
D. load
Correct Answer:
field
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Last Updated:
September 29, 2021