electrical engineering MCQs – Page 36

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

701. According to Flemings right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?
0

A. motion of conductor

B. none of the above

C. either of the above

D. lines of force

702. The starting resistance of a D.C. motor is generally_______________?
0

A. low

B. 1000 Q

C. infinitely large

D. around 500 Q

703. If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?
0

A. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses D. motor will run at very slow speed

B. nothing will happen to the motor

C. this will make armature to take heavy current, possibly burning it

704. Iron losses in a D.C. machine are independent of variations in_____________?
0

A. speed

B. load

C. speed and voltage

D. voltage

705. A shunt generator can self-excite:_________________?
0

A. none

B. only if the resistance of the field circuit is less than critical value

C. irrespective of the value of the resistance in the field circuit

D. only if the resistance of the field circuit is greater than critical value

706. If a D.C. generator fails to build up the probable cause could not be_____________?
0

A. imperfect brush contact

B. no residual magnetism in the generator

C. faulty shunt connections tending to reduce the residual magnetism

D. field resistance less than the critical resistance

707. In the D.C. motor the iron losses occur in____________?
0

A. the field

B. the commutator

C. the armature

D. the brushes

708. The current drawn by the armature of D.C. motor is directly proportional to__________?
0

A. the speed of the motor

B. none of the above

C. the torque required

D. the voltage across the terminals

709. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?
0

A. will be less than 250 V

B. none of the above

C. may be greater or less than 250 V

D. will always be 250 V

710. Following motor is used where high starting torque and wide speed range control is required?
0

A. Synchronous motor

B. None of the above

C. Single phase capacitor start

D. D.C. motor

E. Induction motor

711. Iron losses in a D.C. machine are independent of variations in______________?
0

A. speed

B. speed and voltage

C. load

D. voltage

712. Copper brushes in D.C. machine are used_____________?
0

A. where low voltage and high currents are involved

B. where high voltage and small cur-rents are involved

C. in both of the above cases

D. in none of the above cases

713. Permeance is the reciprocal of______________?
0

A. resistance

B. ampere-turns

C. flux density

D. reluctance

714. The bearings used to support the rotor shafts are generally______________?
0

A. bush bearings

B. needle bearings

C. ball bearings

D. magnetic bearmgs

715. The purpose of retardation test on D.C. shunt machines is to find out____________?
0

A. field copper losses

B. eddy current losses

C. stray losses

D. windage losses

716. Interpole flux should be sufficient to_____________?
0

A. neutralise the commutating self induced e.m.f.

B. neutralise the armature reaction flux

C. neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil

D. perform none of the above functions

717. D.C. generators are normally designed for maximum efficiency around_____________?
0

A. full-load

B. all of the above

C. rated r.p.m.

D. rated voltage

718. In D.C. generators, the brushes on commutator remain in contact with conductors which_________________?
0

A. are farthest from the poles

B. lie under south pole

C. lie under interpolar region

D. lie under north pole

719. 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____________?
0

A. less than 150 V

B. 150 V

C. greater than 150 V

D. none of the above

720. Which of the following generator will have negligible terminal voltage while running on no-load?
0

A. Shunt generator

B. Compound generator

C. Separately excited generator

D. Series generator

Previous Next

Showing 701 to 720 of 7381 mcqs