electrical engineering MCQs – Page 138

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 Review each marked answer and report any item that may be outdated or unclear.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
2741. In D.C. machines the usual limit of slot pitch is________________?
comments icon0

A. between 15 to 20 mm

B. between 5 to 10 mm

C. between 10 to 15 mm

D. between 25 to 35 mm
2742. Cylindrical windings using circular conductors, employed in transformers, are_____________?
comments icon0

A. double layered

B. single layered

C. none of the above

D. multi-layered
2743. If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?
comments icon0
A. Decreases

B. None of the above

C. Stays the same

D. Increases

2744. A certain JFET data sheet gives VGS(off) = -4 V. The pinch-off voltage Vp is _____________?
comments icon0

A. -4 V

B. dependent on VGS

C. data insufficient

D. +4 V
2745. n a common-source JFET amplifier, the output voltage is _____________?
comments icon0
A. 180o out of phase with the input

B. taken at the source

C. 90o out of phase with the input

D. in phase with the input

2746. The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ?
comments icon0

A. Fins

B. All of the above

C. Tubes

D. Corrugations

E. Radiator tanks

2747. An integrating circuit is a simple RC series circuit with output taken across ______________?
comments icon0

A. Both R and C

B. R

C. C

D. None of the above

2748. When drain voltage equals the pinch-off-voltage, then drain current ___________ with the increase in drain voltage?
comments icon0

A. decreases

B. remains constant

C. none of the above

D. increases

2749. In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance ?
comments icon0
A. 50 O

B. 10 O

C. 25 O

D. 40 O

2750. A MOSFET uses the electric field of a _______________to control the channel current?
comments icon0
A. capacitor

B. generator

C. none of the above

D. battery

2751. Hydrogen has a heat transfer co-efficient __________ times that of air?
comments icon0

A. 2.5

B. 4.5

C. 1.5

D. 3.5

2752. is usually used for brush rockers____________?
comments icon0

A. Copper

B. Aluminium

C. Cast-iron

D. Mild steel

2753. The density of hydrogen is __________ times the density of air?
comments icon0

A. 2.5

B. 3.5

C. 1.5

D. 0.07
2754. A Zener diode utilises_____________characteristic for voltage regulation?
comments icon0

A. Forward

B. Reverse

C. Both forward and reverse

D. None of the above

2755. The cold rolled grain oriented steel has _________ permeability in the direction of the grain orientation?
comments icon0

A. none of the above

B. minimum

C. nil

D. maximum
2756. Dummy coil should not be used in_________________?
comments icon0
A. large machines

B. small machines

C. either A. or B.

D. none of the above

2757. The constant-current region of a JFET lies between______________?
comments icon0
A. pinch-off and breakdown

B. cut off and saturation

C. and IDSS

D. cut off and pinch-off

2758. ___________ brushes are fragile and cause excessive wear of commutator?
comments icon0

A. Metal graphite

B. Electro graphitic

C. Natural graphite

D. Hard carbon

2759. The input control parameter of a JFET is __________________?
comments icon0

A. drain voltage

B. gate current

C. source voltage

D. gate voltage
2760. The switch that has the fastest speed of operation is ____________ switch?
comments icon0
A. Electronic

B. Electromechanical

C. None of the above

D. Mechanical