• 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

MCQ on DC Generator – 2

May 31, 2017 by admin

« Back         CONTENTS          Next »

 1. Armature current in D.C. generators is given to the external circuit through
(A) strips.
(B) commutator.
(C) solid connection.
(D) slip rings.

Answer ⇓

           B 

 2. The function of commutator in dc machine is to convert
(A) ac to dc only.
(B) dc to ac only.
(C) either ac to dc or dc to ac.
(D) none of the above.

Answer ⇓

           C 

 3. Two DC generators operating in parallel must have
(A) same kW rating.
(B) same speed.
(C) the same drooping voltage characteristics.
(D) same percentage regulation.

Answer ⇓

           C 

 4. Commutor segments in D.C. machine is equal to number of
(A) carbon brushes.
(B) armature coils.
(C) armature conductors.
(D) slip rings.

Answer ⇓

           B 

 5. The field coils of D.C. generator are usually made of
(A) aluminium.
(B) copper.
(C) silicon steel.
(D) cast iron.

Answer ⇓

           B 

 6. The nature of current flowing in the armature of a dc machine is
(A) ac.
(B) dc.
(C) pulsating.
(D) constant.

Answer ⇓

           A 

 7. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using
(A) filters.
(B) commutator with large number of segments.
(C) carbon brushes of superior quality.
(D) using equiliser rings.

Answer ⇓

           B 

 8. The purpose of providing dummy coils in a generator is
(A) to reduce eddy current losses.
(B) to enhance flux density.
(C) to amplify voltage.
(D) to provide mechanical balance for the rotor.

Answer ⇓

           D 

 9. The winding used in welding generator will have
(A) delta winding.
(B) lap winding.
(C) wave winding.
(D) duplex wave winding.

Answer ⇓

           B 

 10. In case of D.C. machines, mechanical losses are primary function of
(A) current.
(B) voltage.
(C) speed.
(D) power factor.

Answer ⇓

           C 

 11. Permeance is the reciprocal of
(A) flux density.
(B) reluctance.
(C) ampere-turns.
(D) resistance.

Answer ⇓

           B 

 12. If the speed of a DC machine is doubled and the flux remains constant, the generated e.m.f.
(A) remains the same.
(B) is doubled.
(C) is halved.
(D) none of the above.

Answer ⇓

           B 

 13. If the flux per pole of a shunt-wound DC generator is halved, the generated e.m.f. at constant speed
(A) is doubled.
(B) is halved.
(C) remains the same.
(D) none of the above.

Answer ⇓

           B 

 14. The critical resistance of the D.C. generator is the resistance of
(A) field.
(B) brushes.
(C) armature.
(D) load.

Answer ⇓

           A 

 15. If the excitation is critical, the power factor of the alternator is
(A) unity power factor.
(B) leading power factor.
(C) lagging power factor.
(D) none of the above.

Answer ⇓

           A 

« 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 Basic Electronics – 1

Electric potential difference or voltage

MCQs on Basic Electrical

What is circuit breaker and how does it work?

Demo timer

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