Question is ⇒ Fleming's right-hand rule regarding direction of induced e.m.f., correlates, Options are ⇒ (A) magnetic flux, direction of current flow and resultant force, (B) magnetic flux, direction of motion and the direction of e,m.f. induced, (C) magnetic field strength, induced voltage and current, (D) magnetic flux, direction of force and direction of motion of conductor, (E) , Leave your comments or Download question paper.

Question is ⇒ Fleming's right-hand rule regarding direction of induced e.m.f., correlates, Options are ⇒ (A) magnetic flux, direction of current flow and resultant force, (B) magnetic flux, direction of motion and the direction of e,m.f. induced, (C) magnetic field strength, induced voltage and current, (D) magnetic flux, direction of force and direction of motion of conductor, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Fleming's right-hand rule regarding direction of induced e.m.f., correlates
A.	magnetic flux, direction of current flow and resultant force [Wrong Answer]
B.	magnetic flux, direction of motion and the direction of e,m.f. induced [Correct Answer]
C.	magnetic field strength, induced voltage and current [Wrong Answer]
D.	magnetic flux, direction of force and direction of motion of conductor [Wrong Answer]
View Answer 12 -6 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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⇒ To avoid formation of grooves in the csommutator of a D.C. machine
the brushes of opposite polarity should track each other
the brushes of same polarity should track each other
brush position has no effect on the commutator grooving

⇒ With a D.C. generator which of the following regulation is preferred ?
100% regulation
infinite regulation
50% regulation
1% regulation

⇒ Which generator would you prefer for feeding long D.C. transmission lines ?
Series generator
Shunt generator
Over compound generator
Flat compound generator

⇒ A separately excited generator as compared to a self-excited generator
is amenable to better voltage control
is more stable
has exciting current independent of load current
has all above features

⇒ In case of D.C. machine winding, number of commutator segments is equal to
number of armature coils
number of armature coil sides
number of armature conductors
number of armature turns

⇒ The critical resistance of the D.C. generator is the resistance of
field
brushes
armature
load

⇒ Shunt generators are most suited for stable parallel operation because of their
rising voltage characteristics
identical voltage characteristics
drooping voltage characteristics
linear Voltage characteristics

⇒ 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

⇒ Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles ?
Series generator
Shunt generator
Compound generator
None of the above

⇒ Following D.C. generator will be in a position to build up without any residual magnetism in the poles
series generator
shunt generator
compound generator
self-excited generator

⇒ Which of the following could be lamina-proximately the thickness of lamina-tions of a D.C. machine ?
0.005 mm
0.05 mm
0.5m
5m

⇒ When the shunt field of a compound generator is connected across both the series field and armature. Such a convection is known as
short shunt
long shunt
cumulative compounding
differential compounding

⇒ 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
interpoles
dummy coils
compensating winding
shifting of axis of brushes

⇒ 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

⇒ Which of the following statements is incorrect in D.C. shunt generators about hysteresis loss ?
It is independent of lamination thickness
It can be minimize by laminating the armature
It depends upon the supply frequency
None of the above

⇒ For a D.C. machines laboratory following type of D.C. supply will be suitable
rotary converter
mercury are rectifier
induction motor D.C. generator set
synchronous motor D.C. generator set

⇒ In a shunt generator the voltage build up is generally restricted by
speed limitation
armature heating
insulation restrictions
saturation of iron

⇒ 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

⇒ In a D.C. machine, short-circuited field coil will result in
odour of burning insulation
unbalanced magnetic pull producing vibrations
reduction of generated voltage for which excitation has to be increased to maintain the voltage
all above

⇒ 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
150 V
less than 150 V
greater than 150 V
none of the above

⇒ The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except
armature reaction
armature resistance drop
field weakening due to armature reaction and armature
commutation

⇒ D.C. series generator is used
to supply traction load
to supply industrial load at constant voltage
as a booster to maintain constant voltage at the load end of the feeder
for none of the above purpose

⇒ In D.C. generators, the cause of rapid brush wear may be
severe sparking
rough commutator surface
imperfect contact
any of the above

⇒ Welding generator will have
lap winding
wave winding
delta winding
duplex wave winding

⇒ The e.m.f. generated by a shunt wound D.C. generator is E . Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be
E/2
2E
slightly less than E
E

⇒ The resistance of armature winding depends on
length of conductor
cross-sectional area of the conductor
number of conductors
all of the above

⇒ Which of the following components of a D.C. generator plays vital role for providing direct current of a D.C. generator ?
Dummy coils
Commutator
Eye bolt
Equilizer rings

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

⇒ In a D.C. machine, fractional pitch winding is used
to increase the generated voltage
to reduce sparking
to save the copper because of shorter end connections
due to (b) and (c) above

⇒ In a D.C. generator the critical resistance can be increased by
increasing its field resistance
decreasing its field resistance
increasing its speed
decreasing its speed