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
2601. In thermocouples which of the following pairs is commonly used ?
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A. Aluminium-tin

B. Iron-steel

C. Copper-constantan

D. Silver-German silver

2602. Which of the following materials is the best conductor of electricity ?
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A. Copper

B. Tungsten

C. Carbon

D. Aluminium

2603. Overmodulation (amplitude) occurs when signal amplitude is _____________ carrier amplitude?
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A. Greater than

B. None of the above

C. Less than

D. Equal to

2604. Mercury as an electric contact material is_______________?
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A. a metal

B. a gas

C. a liquid

D. a metal liquid
2605. The structure sensitive property of a super conductor is______________?
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A. transition temperature

B. critical magnetic field

C. none of the above

D. critical current density
2606. If firing angle in an SCR circuit is increased, the output _____________?
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A. Is decreased

B. Remains the same

C. None of the above

D. Is increased

2607. The change in flux linkages can be caused in which of the following ways ?
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A. The flux is constant with respect to time and is stationary and the coil moves through it

B. The coil is stationary with respect to flux and the flux varies in magnitude with respect to time

C. Both the changes mentioned above occur together, i.e., the coil moves through a time varying field

D. All of the above
2608. Which of the following variety of copper has the best conductivity ?
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A. Pure annealed copper

B. Induction hardened copper

C. Copper containing traces of silicon

D. Hard drawn copper

2609. Superconductors are becoming popular for use in________________?
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A. generating regions free from magnetic field

B. generating very strong magnetic field

C. generating electrostatic field

D. manufacture of bubble memories

2610. Electrical machines having a power output up to about 750 W may be called__________machines?
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A. medium size

B. any of the above

C. large size

D. small size
2611. The forbidden gap in an insulator is________________?
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A. small

B. any of the above

C. nil

D. large
2612. The conductivity of an extrinsic semiconductor with temperature________________?
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A. decreases

B. increases

C. remains constant
2613. The converse of hardness is known as______________?
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A. malleability

B. toughness

C. none of the above

D. softness
2614. The photo-electric effect occurs only when the incident light has more than a certain critical____________?
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A. intensity

B. wave length

C. speed

D. frequency
2615. The covalent bond is formed by_______________?
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A. transfer of electrons between atoms

B. none of the above

C. sharing of electrons between atoms

D. sharing of variable number of electrons by a variable number of atoms

2616. Substances whose specific resistance abruptly decreases at very low temperature are called___________?
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A. insulators

B. semiconductors

C. superconductors

D. conductors

2617. Surface resistance of an insulating material is reduced due to the______________?
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A. smoky and dirty atmosphere

B. humidity in the atmosphere

C. both (A) and (b)

D. neither (A) nor (b)

2618. In an SCR circuit, the angle of conduction can be changed by__________________?
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A. Reverse biasing the gate

B. Changing anode voltage

C. Changing gate voltage

D. None of the above

2619. The signal voltage induced in the aerial of a radio receiver is of the order of_____________?
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A. V

B. mV

C. V

D. None of the above

2620. An SCR has __________ pn junctions?
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A. Two

B. Three

C. None of the above

D. Four

2621. Superconducting metal in super conducting state has relative permeability of________________?
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A. one

B. zero

C. more than one

D. negative

2622. The carbon percentage is least in__________________?
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A. low carbon steel

B. cast iron

C. wrought iron

D. malleable iron

2623. is an element used in semiconductors whose atoms have three valence electrons?
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A. Germanium

B. A donor

C. An acceptor

D. Silicon

2624. In pakistan, ______________ modulation is used for radio transmission?
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A. Amplitude

B. Phase

C. None of the above

D. Frequency

2625. The conductivity of a conductor can be increased by_______________?
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A. decreasing its vibration

B. increasing its temperature

C. increasing its vibration

D. decreasing its temperature
2626. On which of the following factors does the resistivity of a material depend ?
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A. All of the above

B. Length of the conductor

C. Resistance of the conductor

D. Area of the conductor section

2627. In the above question, what is the power in sidebands ?
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A. 06 kW

B. 6 kW

C. 8 kW

D. 9 kW

2628. The kinetic energy of a bounded electron is______________?
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A. greater than that of unbounded electron

B. none of the above

C. infinite

D. less than that of unbounded electron

E. equal to that of unbounded electron

2629. In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?
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A. any of the above.

B. small

C. large

D. medium

2630. High resistivity materials are used in_____________?
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A. precision instruments

B. incandescent lamps

C. motor starters

D. all of the above

E. heating elements

2631. A class C amplifier always drives _____________load?
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A. A pure capacitive

B. A pure inductive

C. A pure resistive

D. A resonant tank
2632. Which of the following are non-conductors of electricity?
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A. Air and most other gases

B. Non-metal solids except carbon

C. All of the above

D. Pure water and liquids in general except mercury

2633. In an AM wave, the majority of the power is in _____________?
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A. Lower sideband

B. Upper sideband

C. None of the above

D. Carrier
2634. Commonly used conducting materials are_____________?
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A. copper

B. aluminium

C. both (A) and (B)

D. copper and silver

E. platinum and gold

2635. Which of the following affect greatly the resistivity of electrical conductors ?
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A. Pressure

B. Temperature

C. Composition

D. Size

2636. Carbon electrodes are not used in_______________?
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A. GLS lamps

B. dry cells

C. cinema projectors

D. electric arc furnace

2637. Most of the amplification in a superhetrodyne receiver occurs at ______________stage?
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A. Audio amplifier

B. Detector

C. IF

D. RF amplifier

2638. Negative feedback in an amplifier____________?
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A. Reduces bandwidth

B. Increases noise

C. Increase frequency &phase distortion

D. Reduces gain
2639. By increasing impurity content in the metal alloy the residual resistivity always_____________?
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A. increases

B. decreases

C. becomes temperature independent

D. remains constant

2640. Which of the following is the poorest conductor of electricity ?
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A. Aluminium

B. Carbon

C. Steel

D. Silver

2641. For frequencies above the resonant frequency, a parallel LC circuit behaves as a ____________ load?
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A. Inductive

B. None of the above

C. Resistive

D. Capacitive
2642. Low resistivity materials are used in__________?
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A. house wiring

B. transmission and distribution lines

C. transformer, motor and generator windings

D. all above applications
2643. Copper, even though costly, finds use in the windings of electrical machines because_____________?
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A. copper can be easily soldered and welded

B. copper points offer low contact resistance

C. all of the above

D. copper windings are less bulky and the machines become compact

2644. In parallel resonance, there is _______________?
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A. Both voltage and current amplification

B. Voltage amplifications

C. Current amplification

D. None of the above

2645. In induction motors, the length of air gap in kept as small as mechanically possible is order to have____________?
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A. high power factor

B. high over load capacity

C. low power factor

D. any of the above

2646. At 100% modulation, the power in each sideband is _____________ of that of carrier?
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A. 25%

B. 50%

C. 40%

D. 60%

2647. In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then _______________?
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A. XL increases and XC decreases

B. XL decreases and XC increases

C. Both XL and XC increase

D. Both XL and XC decrease

2648. A good electric contact material should have all of the following properties except_____________?
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A. high melting point

B. high resistance to corrosion

C. high resistivity

D. good thermal conductivity

2649. The current gain of a bipolar transistor drops at high frequencies because of____________?
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A. High current effects in the base

B. The early effect

C. Transistor capacitances

D. Parasitic inductive elements

2650. Which of the following high resistance materials has the highest operating temperature ?
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A. Eureka

B. Nichrome

C. Manganin

D. Kanthal