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Home⇒ Engineering⇒
Dc generators
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The armature core of a D.C. generator
is usually made of silicon steel [other wrong options] [Discuss in forum] copper non-ferrous material cast-iron |
Q22 ⇒ D.C. generator generally preferred for
charging automobile batteries is shunt generator [other wrong options] [Discuss in forum] series generator long shunt compound generator any of the above |
Q23 ⇒ The purpose of providing dummy coils
in a generator is to provide mechanical balance for the rotor [other wrong options] [Discuss in forum] to reduce eddy current losses to enhance flux density to amplify voltage |
Q24 ⇒ To avoid formation of grooves in the
csommutator of a D.C. machine the brushes of opposite polarity should track each other [other wrong options] [Discuss in forum] the brushes of same polarity should
track each other brush position has no effect on the commutator grooving |
Q25 ⇒ An exciter for a turbo generator is a shunt generator [other wrong options] [Discuss in forum] separately excited generator series generator compound generator |
Q26 ⇒ The terminal voltage of a D.C. shunt
generator drops on load because of all
of the following reasons except commutation [other wrong options] [Discuss in forum] armature reaction armature resistance drop field weakening due to armature reaction and armature |
Q27 ⇒ The critical resistance of the D.C. generator
is the resistance of field [other wrong options] [Discuss in forum] brushes armature load |
Q28 ⇒ The open circuit voltage of a compound
generator is 250 V. At full load the
terminal voltage may be greater or less than 250 V [other wrong options] [Discuss in forum] will be less than 250 V will always be 250 V none of the above |
Q29 ⇒ The number of armature parallel paths
in a two-pole D.C. generator having
duplex lap winding is 4 [other wrong options] [Discuss in forum] 2 6 8 |
Q30 ⇒ Which one of the following types of generators
does not need equilizers for
satisfactory parallel operation ? Under-compound [other wrong options] [Discuss in forum] Flat-compound Over-compound Series |
Q31 ⇒ If the no load voltage of a certain generator
is 210 V and the rated voltage is
200 V, then the voltage regulation is 0.05 [other wrong options] [Discuss in forum] 0.025 0.1 0.15 |
Q32 ⇒ In D.C. generators the pole shoes are
fastened to the pole core by counter sunk screws [other wrong options] [Discuss in forum] rivets brazing welding |
Q33 ⇒ Copper brushes in D.C. machine are
used where low voltage and high currents are involved [other wrong options] [Discuss in forum] where high voltage and small currents
are involved in both of the above cases in none of the above cases |
Q34 ⇒ In case of a 4-pole D.C. generator
provided with a two layer lap winding
with sixteen coils, the pole pitch will be 8 [other wrong options] [Discuss in forum] 4 16 32 |
Q35 ⇒ In D.C. generators, the brushes on commutator
remain in contact with conductors
which lie under interpolar region [other wrong options] [Discuss in forum] lie under south pole lie under north pole are farthest from the poles |
Q36 ⇒ In case of D.C. machine winding, number
of commutator segments is equal to number of armature coils [other wrong options] [Discuss in forum] number of armature coil sides number of armature conductors number of armature turns |
Q37 ⇒ Compensating windings are used in
D.C. generators to neutralise the cross-magnetising effect of the armature reaction [other wrong options] [Discuss in forum] mainly to reduce the eddy currents
by providing local short-circuits to provide path for the circulation of cooling air none of the above |
Q38 ⇒ D.C. generator generates a.c. voltage in the armature [other wrong options] [Discuss in forum] d.c. voltage in the armature a.c. superimposed over d.c. none of the above |
Q39 ⇒ In a D.C. generator the number of
mechanical degrees and electrical
degrees will be the same when number of poles is 2 [other wrong options] [Discuss in forum] r.p.m. is more than 300 r.p.m. is less than 300 number of poles is 4 |
Q40 ⇒ In a shunt generator the voltage build
up is generally restricted by saturation of iron [other wrong options] [Discuss in forum] speed limitation armature heating insulation restrictions |
Or |