DC Generator MCQs In English -04 - This
question is important for the Online Trade CBT Exam for the 2nd year,
the entire question is based on the NIMI pattern (NSQF Level 5).
This
question is also important for other competitive exams like JE,
Technial Helper, RRB, ALP, Metro, Technician, JDVVNL, JVVNL, UPPCL, DRDO
etc.
DC Generator MCQs In English -04
1. Lamination’s core is usually made up of
(A) Cast iron
(B) Carbon
(C) Silicon Steel
(D) Stainless Steel
Answer: C
2. Which is the thickness of the D.C. machine Lamination’s?
(A) 0.005 mm
(B) 0.05 mm
(C) 0.5 mm
(D) 5 mm
Answer: C
3. Bearings used to support the rotor shaft are usually
(A) Ball bearings
(B) Bushing Bearings
(C) magnetic molar
(D) needle bearings
Answer: A
4. The armature of the D.C. generator is laminated
(A) reduce the copper loss
(B) provide the copper loss
(C) insulate the core
(D) reduce eddy current loss
Answer: D
5. In a dc machine armature winding resistance depends on
(A) conductor length
(B) Cross-sectional area of conductor
(C) Number of conductors
(D) ALL OF THE ABOVE
Answer: D
6. The field coils of the D.C. generator are usually made
(A) Asbestos
(B) copper
(C) Cast iron
(D) Carbon
Answer: B
7. In the A four-pole D.C. machine
(A) All four poles are north poles
(B) Alternate poles are north and south
(C) All four poles are south poles
(D) Two north poles follow two south poles
Answer: B
8. The commutator segments are connected to the armature conductor with
(A) copper lugs
(B) resistance wires
(C) Insulation Pad
(D) brazing
Answer: A
9. In a commutator
(A) copper is harder than mica
(B) Asbestos and copper are equally hard
(C) Asbestos is harder than copper
(D) None of the above
Answer: C
10. Pole shoes in D.C generators are fastened by pole cores.
(A) rivets
(B) counter sunk screws
(C) brazing
(D) welding
Answer: B
11. A differentially excited generator compared to a self-excited generator
(A) is responsible for better voltage control
(B) is more stable
(C) Free current of load current is
(D) All of the above are characteristics
Answer: D
12. Inspired E.M.F. According to Fleming's right-hand rule to find the direction of, when the inspired E.M.F. If the middle finger points in the direction of, then the index finger will point in the back direction.
(A) conductor speed
(B) force lines
(C) either of the above
(D) None of the above
Answer: B
13. Iron losses in the D.C. machine are independent of whose change
(A) speed
(B) weight
(C) voltage
(D) Speed and voltage
Answer: B
14. Fleming's right-hand rule regarding the direction of the induced e.m.f is co-related.
(A) magnetic flux, direction of current flow and the resultant force
(B) magnetic flux, direction of motion and EMF Moved towards
(C) Magnetic field strength, induced voltage and current
(D) Magnetic flux, direction of force and direction of motion of conductor
Answer: B
15. Motivated according to Fleming's right-hand rule e.m.f. When applying in the direction of, to whom does the thumb point
(A) Inspired EMF direction of
(B) direction of flow
(C) If the EMF If the façade indicates the direction of motion of the driver.
(D) The direction of motion of the conductor, if the index finger points to the flow
Answer: D
16. In D.C generators, rapid brush wear may be the cause
(A) severe sparking
(B) rough commutator surface
(C) incomplete contact
(D) any of the above
Answer: D
17. The number of brushes in lap winding is always
(A) double the number of poles
(B) same as number of poles
(C) Half the number of poles
(D) two
Answer: B
18. When the number of poles and the number of armature conductors are determined for the A D.C. generator, which winding is the highest EMF Will generate
(A) lap winding
(B) Wave winding
(C) Both of (A) and (B) above
(D) depends on other features of the design
Answer: B
19. Copper brush is used in D.C machine
(A) where low voltage and high currents are involved
(B) where high voltage and small currents are involved
(C) In both the above cases
(D) None of the above cases
Answer: A
20. In the case of DC machines, mechanical losses are the primary function.
(A) current
(B) voltage
(C) speed
(D) None of the above
Answer: C