• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

How Engineering Works

  • Home
  • About Us
  • Electrical Engineering
    • Interview Questions
  • Privacy Policy
  • Disclaimer
  • Contact Us
  • Blog

MCQs on DC Machine

April 7, 2017 by admin

« Back         CONTENTS          Next »

1. The number of parallel path in a simplex lap winding is equal to
(a) number of poles
(b) number of pole pairs
(c) two
(d) two times number of pole      

Answer

           A 

 2. The number of parallel path in a simplex wave windings are equal to 
(a) two
(b) number of poles
(c) number of poles pairs
(d) no of coils 

Answer

           A 

 3. The number of parallel path in a 8-pole duplex wave winding is equal to
(a) 2
(b) 4
(c) 8
(d) 16 

Answer

           B 

 4. The number of parallel path in a 8-pole duplex lap winding is equal to
(a) 4
(b) 8
(c) 16
(d) 32 

Answer

           C 

 5. In DC machine, the fractional pitch winding is used to
(a) produce vibration
(b) reduce sparking
(c) avoid hunting
(d) avoid magnetic locking 

Answer

           B 

 6. In a DC machine, the sparking at the brushes is due to
(a) low contact resistance
(b) reactance voltage
(c) armature reaction
(d) over excitation 

Answer

           B 

 7. When the field excitation of a DC generator increases, its generated emf
(a) decreases
(b) increases
(c) remain same
(d) first increases then constant 

Answer

           D 

 8. The field coil of a DC machine are usually made of
(a) copper
(b) aluminium
(c) carbon
(d) mica    

Answer

           A 

  9. Then insulating material used between commutator segment is generally
(a) paper
(b) mica
(c) plastic
(d) fibre 

Answer

           B 

You may also read
• Why all the voltage levels are multiples of 11 kV?
• Why Motor rated in kW instead of kVA?

 10. The function of dummy coils in DC machines is to
(a) reduce armature reaction
(b) provide alternate flux
(c) reduce losses
(d) provide mechanical balancing    

Answer

           B 

  11. Permeability is reciprocal of  
(a) susceptibility
(b) reluctivity
(c) permittivity
(d) conductivity

Answer

           B

 12. The purpose of using dummy coil in a DC machine is to
(a) reduce losses
(b) reduce armature reaction
(c) provide mechanical balance to armature
(d) improve power factor 

Answer

           C 

 13. The rotor part of a DC machine carries
(a) armature winding
(b) field winding
(c) either field or armature winding
(d) none of the above         

Answer

           A 

 14. If a field winding designed for series connection is connected in parallel, the machine will
(a) draw very high current
(b) stand still
(c) run normally
(d) run at slow speed            

Answer

           A 

 15. In the commutative compound machine, the mmf of the series field winding will ________ to the mmf of the shunt field winding.
(a) add
(b) minus
(c) same
(d) half     

Answer

           A 

 16. Which is the basic dominant factor in the production of the magnetic flux in a compound machine?
(a) Shunt field mmf
(b) Series field mmf
(c) Both shunt and series field mmf
(d) None of the above    

Answer

           A 

 17. The principle of dynamically induced emf is used in
(a) generator
(b) battery
(c) transformer
(d) all of the above     

Answer

           A 

 18. A dummy coil may required in a DC machine, if the machine is
(a) lap wound
(b) wave wound
(c) either lap or wave wound
(d) none of the above         

Answer

           B 

 19. In a DC Machine, the frog leg wound armature are designed for the use with
(a) high current high voltage
(b) high current low voltage
(c) moderate current and moderate voltage
(d) low current and low voltage 

Answer

           C 

 20. Which of the following is main factor to determine the size and rating of and electric machine?
(a) Current
(b) Temperature
(c) Speed
(d) Voltage 

Answer

           B 

« BACK                                        NEXT »


Also Read :

  • Why all the voltage levels are multiples of 11 kV? asked by Bahu
  • What is the function of a choke in tube light? asked by varu
  • What is the meaning of DYN11 in a transformer? asked by Hiter
  • What is the difference between Earthing and Grounding? asked by admin


INTERVIEW QUESTIONS

MCQ or Objective


Filed Under: Electrical MCQ

Primary Sidebar


MCQ on Basic Electrical


MCQ on Electrical Circuit Theory 


MCQ on Electrical Devices 


MCQ on Measuring Instruments 


MCQ on Engineering Materials 


MCQ on Power Generation 


MCQ on Switchgear and Protection  


MCQ on DC Machine 


MCQ on DC Generator 


MCQ on DC motor 


MCQ on Special Motor 


MCQ on Alternator 


MCQ on Synchronous Motor 


MCQ on Induction Motor 


MCQ on Transformer 


MCQ on Transmission and Distribution 


MCQ on Underground Cables



INTERVIEW QUESTIONS

MCQ or Objective


Recommended Post

MCQ on Electromagnatism – 1

Electric Power

MCQs on Induction Motor

MCQs on Electrical Circuit Theory

MCQ on Synchronous motor – 1

Categories

  • Electrical Articles (19)
  • Electrical MCQ (75)
  • Electrical Questions (11)
  • Interviews Questions (7)
  • IQ Test (1)
  • Uncategorized (12)



Join Our Whatsapp Group


About Us | Privacy Policy | Disclaimer


Copyright@ Since-2017