Question is ⇒ An exciter for a turbo generator is a, Options are ⇒ (A) separately excited generator, (B) shunt generator, (C) series generator, (D) compound generator, (E) , Leave your comments or Download question paper.

Question is ⇒ An exciter for a turbo generator is a, Options are ⇒ (A) separately excited generator, (B) shunt generator, (C) series generator, (D) compound generator, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	An exciter for a turbo generator is a
A.	separately excited generator [Wrong Answer]
B.	shunt generator [Correct Answer]
C.	series generator [Wrong Answer]
D.	compound generator [Wrong Answer]
View Answer 15 -10 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ In a four-pole D.C. machine
all the four poles are north poles
alternate poles are north and south
all the four poles are south poles
two north poles follow two south poles

⇒ In case of a flat compounded generator
voltage generated is less than the rated voltage
generated voltage is proportional to the load on the generator
voltage remains constant irrespective of the load
speed varies in proportion to the load on the generator

⇒ Flashing the field of D.C. generator means
neutralising residual magnetism
creating residual magnetism by a D.C. source
making the magnetic losses of forces parallel
increasing flux density by adding extra turns of windings on poles

⇒ The field coils of D.C. generator are usually made of
mica
copper
cast iron
carbon

⇒ In a commutator
copper is harder than mica
mica and copper are equally hard
mica is harder than copper
none of the above

⇒ The demagnetising component of armature reaction in a D.C. generator
reduces generator e.m.f.
increases armature speed
reduces interpoles flux density
results in sparking trouble

⇒ In a D.C. generator, if p be the number of poles and N be the r.p.m. of rotor, then the frequency of magnetic reversals will be

120

3000

⇒ Drop in speed of a D.C. generator due to increase in load can be compensated by
cooling the arm.ature
increasing the armature resistance
reducing the load voltage
increasing the input to the prime mover

⇒ Copper brushes in D.C. machine are used
where low voltage and high currents are involved
where high voltage and small currents are involved
in both of the above cases
in none of the above cases

⇒ Open circuited armature coil of a D.C. machine is
identified by the scarring of the commutator segment to which open circuited coil is connected
indicated by a spark completely around the 'commutator
both (a) and (b)
none of the above

⇒ Requirement of speed at which machine is driven is
more critical in the case of altenators
more critical in the case of D.C. generators
equally critical in the case of alternators as well as D.C. generators

⇒ In D.C. generators on no-load, the air gap flux distribution in space is
sinusoidal
triangular
pulsating
flat topped

⇒ In D.C. generator the change in voltage when the load is reduced from rated value to zero, expressed as a percentage of rated load voltage, is known as
efficiency
regulation
armature reactance
loss factor

⇒ Interpole flux should be sufficient to
neutralise the commutating self-induced e.m.f.
neutralise the armature reaction flux
neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
perform none of the above functions

⇒ The voltage drop for which of the following types of brush can be expected to be least ?
Graphite brushes
Carbon brushes
Metal graphite brushes
None of the above

⇒ For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
Lap winding
Wave winding
Either of (a) and (b) above
Depends on other features of design

⇒ A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be
zero
about 2 V
about 50V
220 V

⇒ In a lap wound D.C. generator having p as number of poles and Z as number of conductors, the maximum number of equilizer rings will be
Z
P

⇒ Which of the following generator will have negligible terminal voltage while running on no-load ?
Series generator
Shunt generator
Compound generator
Separately excited generator

⇒ When two D.C. series generators are running in parallel, an equilizer bar is used
to increase the speed and hence generated e.m.f.
to increase the series flux
so that two similar machines will pass approximately equal currents to the load
to reduce the combined effect of armature reaction of both machines

⇒ The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is
2
4
6
8

⇒ Armature reaction in a generator results in
demagnetisation of leacfing pole tip and magnetisation of trailing pole tip
demagnetisation of trailing pole tip and magnetisation of leading pole tip
damagnetising the centre of all poles
magnetising the centre of all poles

⇒ In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when
there is no load on the generator
the generator runs on full load
the generator runs on overload
the generator runs on designed speed

⇒ Number of tappings for each equilizer ring is equal to
number of pole pairs
number of poles
number of parallel paths
number of commutator segments

⇒ Which one of the following types of generators does not need equilizers for satisfactory parallel operation ?
Flat-compound
Over-compound
Under-compound
Series

⇒ A D.C. welding generator has
lap winding
wave moving
duplex winding
any of the above

⇒ In the case of lap winding resultant pitch is
multiplication of front and back pitches
division of front pitch by back pitch
sum of front and back pitches
difference of front and back pitches

⇒ A D.C. generator fails to build up the probable cause could not be
imperfect brush contact
field resistance less than the critical resistance
no residual magnetism in the generator
faulty shunt connections tending to reduce the residual magnetism

⇒ Eddy currents are induced in the pole shoes of a D.C. machine due to
oscillating magnetic field
pulsating magnetic flux
relative rotation between field and armature
all above

⇒ The main factor which leads to unstable parallel operation of flat and over compounded generators is
their rising voltage characteristics
unequal number of turns in their series field windings
unequal speed regulation of their primemovers
unequal series field resistances