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
1551. Form Factor is the ratio of__________?
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A. average value/peak value

B. average value/r.m.s. value

C. r.m.s. value/average value

D. r.m.s. value/peak value

1552. The average charging voltage for alkali cell is about__________?
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A. 1 V

B. 1.2 V

C. 1.7 V

D. 2.1 V

1553. The safest value of current the human body can carry for more than 3 second is_________?
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A. 9 mA

B. 25 mA

C. 4 mA

D. 15 mA

1554. Shelf life of a small dry cell is___________?
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A. equal to that of large dry cell

B. none of the above

C. less than that of large dry cell

D. more than that of large dry cell

1555. If two sine waves of the same frequency have a phase difference of JT radians, then_______?
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A. both will reach their minimum values at the same instant

B. both will reach their maximum values at the same instant

C. when one wave reaches its maximum value, the other will reach its minimum value

D. none of the above

1556. The lead-acid cell should never be discharged beyond____________?
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A. 2 V

B. 1.8 V

C. 1.9 V

D. 2.1 V

1557. If the length of a cable is doubled, its capacitance____________?
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A. becomes one-half

B. remains unchanged

C. becomes double

D. becomes one-fourth

1558. A cable carrying alternating current has__________?
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A. hysteresis losses only

B. hysteresis, leakage and copper losses only

C. hysteresis and leakage losses only

D. hysteresis, leakage, copper and friction losses

1559. Weston standard cell at 20C has voltage of _______ volts
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A. 1.0187

B. 1.5

C. 0.9

D. 0.8

1560. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?
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A. the big size of the inductor

B. the reactance of the inductor

C. the current flowing in the inductor

D. the statement given is false
1561. The specific gravity of electrolyte is measured by____________?
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A. a mechanical gauge

B. psychrometer

C. hydrometer

D. manometer

1562. The output voltage of a charger is__________?
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A. the same as the battery voltage

B. less than the battery voltage

C. higher than the battery voltage

D. none of the above

1563. Cells are connected in series in order to_____________?
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A. none of the above

B. increase the current rating

C. increase the life of the cells

D. increase the voltage rating
1564. Inductance affects the direct current flow__________?
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A. only at the time of turning off

B. at all the time of operation

C. at the time of turning on and off

D. only at the time of turning on

1565. Battery charging equipment is generally installed______________?
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A. in well ventilated location

B. in location having all above features

C. as near as practical to the battery being charged

D. in clean and dry place

1566. The transient currents are associated with the____________?
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A. impedance of the circuit

B. resistance of the circuit

C. changes in the stored energy in the inductors and capacitors

D. applied voltage to the circuit

1567. The power is measured in terms of decibles in case of_________?
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A. auto transformers

B. current transformers

C. electronic equipment

D. transformers

1568. In a lead-acid cell, lead is called as____________?
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A. negative active material

B. positive active material

C. none of the above

D. passive material

1569. In a three-phase supply floating neutral is undesirable because it way give rise to___________?
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A. high voltage across the load

B. minimun voltage across the load

C. unequal line voltages across the load

D. low voltage across the load

1570. All the electrical connections between the battery and vehicle should be by____________?
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A. flexible cables

B. thin copper wires

C. thin aluminium wires

D. rigid cables

1571. The product of apparent power and cosine of the phase angle between circuit voltage and current is
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A. instantaneous power

B. reactive power

C. volt-amperes

D. true power
1572. Capacitors for power factor correction are rated in_________?
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A. kVAR

B. kV

C. kW

D. kVA

1573. Cables for 220 kV lines are invariably____________?
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A. rubber insulated

B. compressed oil or compressed gas insulated

C. mica insulated

D. none of the above

E. paper insulated

1574. If a battery is wrongly connected on charge following will happen__________?
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A. current drawing will be nil

B. current drawing will be very small

C. current delivered by the battery will be high

D. current drawing will be very high
1575. The square waveform of current has following relation between r.m.s. value and average value?
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A. r.m.s. value of current is less than average value

B. none of the above

C. r.m.s. value is equal to average value

D. r.m.s. value of current is greater than average value

1576. In cables the charging current__________?
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A. leads the voltage by 90

B. lags the voltage by 90

C. leads the voltage by 180

D. lags the voltage by 180

1577. Cell short circuit results in_________?
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A. all above

B. low sp. gravity electrolyte

C. abnormal high temperature

D. reduced gassing on charge

1578. The thickness of the layer of insulation on the conductor, in cables, depends upon___________?
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A. reactive power

B. current carrying capacity

C. voltage

D. power factor

1579. Following will occur if level of electrolyte falls below plates____________?
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A. capacity of the cell is reduced

B. open plates are converted to lead sulphate

C. all above

D. life of the cell is reduced

1580. The capacity of a lead-acid cell depends on
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A. temperature

B. rate of discharge

C. quantity of active materials

D. all above

E. density of electrolyte

1581. On overcharging a battery____________?
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A. it will bring about chemical change in active materials

B. it will increase the capacity of the battery

C. none of the above will occur

D. it will raise the specific gravity of the electrolyte

1582. When the lead-acid cell is fully charged, the electrolyte assumes _______ appearance
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A. dull

B. bright

C. milky

D. reddish

1583. Electrolyte used in an Edison cell is___________?
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A. NaOH

B. HC1

C. KOH

D. HN03

1584. Following will happen if the specific gravity of electrolyte becomes more than 1.23
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A. All above

B. Corrosion of the grids of the plate

C. Loss of capacity

D. Loss of life

1585. In a pure inductive circuit___________?
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A. the current lags behind the voltage by 90

B. the current leads the voltage by 90

C. the current is in phase with the voltage

D. the current can lead or lag by 90

1586. The capacity of a battery is expressed in terms of____________?
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A. none of the above

B. current rating

C. voltage rating

D. ampere-hour rating
1587. Pressure cables are generally not used beyond__________?
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A. 66 kV

B. 132 kV

C. 33 kV

D. 11 kV

1588. Sulphated cells are indicated by____________?
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A. the decrease of the specific gravity

B. the low voltage of the cell on discharge

C. the loss of capacity of the cell

D. all above conditions
1589. Power factor of electric bulb is__________?
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A. lagging

B. unity

C. leading

D. zero

1590. In a parallel R-C circuit, the current always________the applied voltage?
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A. none of the above

B. remains in phase with

C. leads

D. lags

1591. In AC. circuits, laminated iron is invariably used in order to__________?
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A. reduce eddy current loss

B. reduce circuit permeability

C. make assembly cheap and easier

D. increase heat radiation

1592. Time constant of a capacitive circuit__________?
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A. increases with the decrease of capacitance and decrease of resistance

B. increases with the decrease of capacitance and increase of resistance

C. increases with the increase of capacitance and decrease of resistance

D. increase with increase of capacitance and increase of resistance
1593. Form factor for a sine wave is________?
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A. 0.707

B. 0.637

C. 1.11

D. 1.414

1594. The power factor of a D.C. circuit is always__________?
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A. greater than unity

B. unity

C. less than unity

D. zero

1595. Undercharging___________?
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A. reduces specific gravity of the electrolyte

B. increases the temperature

C. produces excessive gassing

D. increases specific gravity of the electrolyte

1596. Hydrogen evolved during charging produces explosive mixture when it is more than___________?
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A. 2%

B. 4%

C. 8%

D. 6%

1597. Internal short circuits are caused by___________?
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A. breakdown of one or more separators

B. excess accumulation of sediment at the bottom of the cell

C. both (A) and (B)

D. none of the above

1598. A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
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A. peak voltage

B. r.m.s. voltage

C. average voltage

D. none of the above

1599. A battery of 6 cells will show a drop of _______ volts from fully charged state to fully discharged state
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A. 2.4

B. 1.5

C. 1

D. 2.9

1600. The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to__________?
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A. absence of ripples

B. smaller dielectric loss

C. absence of harmonics

D. none of the above

E. non-existence of any stability limit