electrical engineering MCQs – Page 185

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
3681. Electric flux linked with a surface will be maximum when____________?
comments icon0

A. All of the above

B. The surface makes an angle of 45with the field

C. The surface is held parallel to the electric field

D. The surface is held perpendicular to the electric field
3682. If two charges are increased by two times then force_____________?
comments icon0

A. Decreases 9 times

B. Increases 9 times

C. Increases 4 times

D. Decreases 4 times

3683. Current produced by moving the loop of wire across a magnetic field is called_____________?
comments icon0

A. mean square current

B. D.C current

C. induced current

D. A.C current

3684. The noise factor of an ideal amplifier expressed in db is_____________?
comments icon0

A. 1

B. 0

C. 1

D. 10

3685. The maximum collector efficiency of class B operation is ________________?
comments icon0

A. 50%

B. 5%

C. 90%

D. 5%
3686. The slope of a.c. load line is ______________ that of d.c. load line?
comments icon0
A. More than

B. None of the above

C. The same as

D. Less than

3687. A dynamo converts______________?
comments icon0
A. mechanical energy into electrical energy

B. electrical energy into mechanical energy

C. magnetic energy into electrical energy

D. magnetic energy into mechanical energy

3688. If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?
comments icon0

A. High

B. Very high

C. Low

D. Moderate

3689. A.C and D.C have the same______________?
comments icon0

A. effect in charging a battery

B. heating effect through a resistance

C. effect while passing through an inductance

D. effect in charging a capacitor

3690. The final stage of a multistage amplifier uses______________?
comments icon0

A. Direct coupling

B. Impedance coupling

C. Transformer coupling

D. RC coupling

3691. When a multistage amplifier is to amplify d.c. signal, then one must use_____________coupling?
comments icon0
A. Direct

B. RC

C. Transformer

D. None of the above

3692. capacitor is to have an energy content of 20J it must be placed across a potential difference of________________?
comments icon0
A. 2 volts

B. 9 volts

C. 1 vol

D. 4 volts

3693. In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?
comments icon0

A. 270o

B. 0o

C. 180o

D. 90o

3694. If the power level of an amplifier reduces to half, the db gain will fall by___________?
comments icon0

A. 5 db

B. 2 db

C. 10 db

D. 3 db
3695. The only difference between construction of D.C generator and A.C generator is that of_______________?
comments icon0
A. commutator

B. magnetic field

C. coil

D. carbon brushes

3696. A class A power amplifier is sometimes called______________amplifier?
comments icon0

A. Symmetrical

B. Reciprocating

C. Single-ended

D. Differential

3697. Power amplifiers generally use transformer coupling because transformer permits______________?
comments icon0

A. Distortionless output

B. Cooling of the circuit

C. Good frequency response

D. Impedance matching
3698. Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is__________?
comments icon0
A. -8.30 dB

B. 0 dB

C. 8.30 dB

D. 0.8 dB

3699. A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?
comments icon0

A. A torque about horizontal axis

B. An upward force along the axis

C. No resultant force

D. A torque about vertical axis

3700. If free space between the plates of a capacitor is replaced by a dielectric_____________?
comments icon0

A. The potential difference remains constant capacittance and energy stored increases

B. The potential difference remains constant capacittance decreases and energy increases

C. The potential difference decreases but both capacitance and energy increase

D. both potential difference and capacitance decrease but energy increases