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
2701. When a transistor is used as an amplifier, it is operated in the _____________ region?
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A. Saturation

B. Off

C. None of the above

D. Active
2702. The resistance of an ideal voltmeter is ______________?
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A. Zero

B. Low

C. Infinite

D. High

2703. _____________ has the lowest noise-level?
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A. triode

B. JFET

C. tetrode

D. ordinary trnsistor

2704. If load resistance in the above question (Q.49) is removed, the output voltage will_____________?
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A. stay the same

B. increase

C. decrease

D. be zero

2705. When a rectangular voltage waveform is applied to a capacitor, then the current waveform is ______________?
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A. Sinusoidal

B. Sawtooth

C. Square

D. Rectangular
2706. In a certain CS JFET amplifier, RD= 1kO , RS= 560 O , VDD=10V and gm= 4500 S. If the source resistor is completely bypassed, the voltage gain is ________________?
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A. 4.5

B. 45

C. 2.52

D. 450

2707. Which of the following devices has the highest input impedance ?
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A. ordinary transistor

B. MOSFET

C. JFET

D. Crystal diode

2708. Disc windings are primarily used in_____________-?
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A. medium capacity transformers

B. high capacity transformers

C. short capacity transformers

D. any of the above

2709. The input resistance of a VTVM is about ______________?
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A. 1000 O

B. 10 MO

C. 10 kO

D. 20 kO

2710. Which of the following is the basic consideration in the design of insulation ?
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A. Mechanical considerations

B. All of the above

C. Electrical considerations

D. Thermal considerations

2711. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
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A. Aluminium

B. Copper

C. Cast-iron

D. Steel

2712. A relay is superior to a mechanical switch because it _______________?
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A. Combines control with power amplification

B. Does not require moving contacts

C. None of the above

D. Is relatively inexpensive

2713. The channel of a JFET is between the ________________?
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A. drain and source

B. gate and drain

C. gate and source

D. input and output

2714. A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement ?
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A. 3 kO

B. kO

C. 6 kO

D. kO

2715. Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ?
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A. Increased I R losses

B. All of the above

C. Change in motor parameters

D. Poor commutation

E. Increased core losses

2716. A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation ?
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A. None of the above

B. 09%

C. 72%

D. 87%

2717. Which of the following is likely to have the largest resistance ?
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A. Voltmeter of range 10 V

B. Ammeter of range 1 A

C. Moving coil galvanometer

D. A copper wire of length 1 m and diameter 3 mm

2718. If d.c. supply of 10 V is fed to a differentiating circuit, then output will be_______________?
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A. None of the above

B. 20 V

C. 10 V

D. 0 V
2719. In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers ______________?
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A. almost touch each other

B. have moderate gap

C. none of the above

D. have large gap

2720. D.C. servomotors are used in______________?
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A. purely D.C. control systems

B. purely AC. control systems

C. both D.C. and AC. control systems

D. none of the above

2721. When a transistor is driven to cut off, ideally the output is _______________?
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A. VCC

B. VCC/3

C. VCC/2

D. 0

2722. Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?
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A. any of the above size

B. large size

C. small size

D. medium size

2723. The active components in an IC are _______________?
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A. Capacitors

B. Transistors and diodes

C. Resistors

D. None of the above

2724. Which of the following is most difficult to fabricate in an IC ?
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A. Diode

B. FET

C. Capacitor

D. Transistor

2725. A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?
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A. 4 + 0.7 kV mm

B. 5 + 0.9 kV mm

C. 1 + 0.2 kVmm

D. 2 + 0.5 kVmm

2726. For an integrating circuit to be effective , the RC product should be____________ the time period of the input wave?
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A. 5 times greater than

B. At least 10 times greater than

C. Equal to

D. 5 times smaller than

2727. For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
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A. 3.2 to 4.2 A/mm2

B. 1.0 to 1.2 A/mm2

C. 1.5 to 2.0 A/mm2

D. 2.2 to 3.2 A/mm2
2728. If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ______________?
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A. is increased

B. remains the same

C. is decreased

D. none of the above

2729. A JFET is similar in operation to ___________ valve?
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A. diode

B. pentode

C. tetrode

D. triode

2730. A power supply which has voltage regulation of ____________ is unregulated power supply?
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A. 5%

B. 8%

C. 10 %

D. 0%

2731. Zener diode can be used as__________________?
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A. c. voltage regulator only

B. c. voltage regulator only

C. both D.C and A.C voltage regulator

D. none of the above

2732. An astable multivibrator has ________________?
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A. One stable state

B. No stable state

C. None of the above

D. Two stable states

2733. A transistor takes_____________ inductor on a silicon IC chip?
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A. More space than

B. None of the above

C. Less space than

D. Same space as

2734. An audio amplifier is an example of _________________?
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A. Digital IC

B. Linear IC

C. Both digital and linear IC

D. None of the above

2735. If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?
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A. 10%

B. 20%

C. 15%

D. 5%
2736. If the gate of a JFET is made less negative, the width of the conducting channel__________________?
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A. is increased

B. none of the above

C. is decreased

D. remains the same

2737. A Zener voltage regulator is used for ____________ load currents?
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A. High

B. Moderate

C. Small

D. Very high

2738. A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes______________?
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A. Zero

B. Less than load current

C. More than load current

D. None of the above

2739. ______________ multivibrator is a square wave oscillator?
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A. Monostable

B. Astable

C. Bistable

D. None of the above

2740. In a p-channel JFET, the charge carriers are _____________?
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A. electrons

B. holes

C. both electrons and holes

D. none of the above

2741. In D.C. machines the usual limit of slot pitch is________________?
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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_____________?
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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______________?
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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 _____________?
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A. -4 V

B. dependent on VGS

C. data insufficient

D. +4 V
2745. n a common-source JFET amplifier, the output voltage is _____________?
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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 ?
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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 ______________?
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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?
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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 ?
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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?
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A. capacitor

B. generator

C. none of the above

D. battery