MCQOPTIONS
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MCQOPTIONS
This section includes 100 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following meters are not used on D.C. circuits______________? |
| A. | Mercury motor meters |
| B. | Commutator motor meters |
| C. | Induction meters |
| D. | None of the above |
| Answer» D. None of the above | |
| 2. |
Which of the following devices should be used for accurate measurement of low D.C. voltage ? |
| A. | Small range moving coil voltmeter |
| B. | D.C. potentiometer |
| C. | Small range thermocouple voltmeter |
| D. | None of the above |
| Answer» C. Small range thermocouple voltmeter | |
| 3. |
When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is____________? |
| A. | short-circuited |
| B. | all right |
| C. | faulty |
| Answer» C. faulty | |
| 4. |
Wattmeter cannot be designed on the principle of_________________? |
| A. | electrostatic instrument |
| B. | thermocouple instrument |
| C. | moving iron instrument |
| D. | electrodynamic instrument |
| Answer» D. electrodynamic instrument | |
| 5. |
Wagner earthing device is used to eliminate errors due to________________? |
| A. | electrostatic coupling |
| B. | electromagnetic coupling |
| C. | both A. and B. |
| D. | none of the above |
| Answer» B. electromagnetic coupling | |
| 6. |
Volt box is a component to_____________? |
| A. | extend voltage range |
| B. | measure voltage |
| C. | compare voltage in a box |
| D. | none of the above |
| Answer» B. measure voltage | |
| 7. |
Various adjustments in an energy meter include_______________? |
| A. | light load or friction |
| B. | lag and creep |
| C. | overload and voltage compensation |
| D. | temperature compensation |
| E. | all of the above |
| Answer» F. | |
| 8. |
Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to_____________? |
| A. | improve its ventilation |
| B. | eliminate creeping at no load |
| C. | increase its deflecting torque |
| D. | increase its braking torque |
| Answer» C. increase its deflecting torque | |
| 9. |
To measure radio frequency, the suitable frequency meter is_______________? |
| A. | Weston frequency meter |
| B. | reed vibrator frequency meter |
| C. | heterodoxy frequency meter |
| D. | electrical resonance frequency meter |
| Answer» D. electrical resonance frequency meter | |
| 10. |
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________? |
| A. | from a source which is not the same as the unknown voltage |
| B. | from a battery |
| C. | from the same source as the unknown voltage |
| D. | any of the above |
| Answer» D. any of the above | |
| 11. |
To measure a resistance with the help of a potentiometer it is_________________? |
| A. | necessary to standardise the potentiometer |
| B. | not necessary to standardise the potentiometer |
| C. | necessary to use a volt ratio box in conjunction with the potentiometer |
| D. | none of the above |
| Answer» C. necessary to use a volt ratio box in conjunction with the potentiometer | |
| 12. |
To avoid the effect of stray magnetic field in A.C. bridges we can use_______________? |
| A. | magnetic screening |
| B. | Wagner earthing device |
| C. | wave filters |
| D. | any of the above |
| Answer» B. Wagner earthing device | |
| 13. |
The use of _________ instruments is merely confined within laboratories as standardizing instruments? |
| A. | absolute |
| B. | indicating |
| C. | recording |
| D. | integrating |
| E. | none of the above |
| Answer» B. indicating | |
| 14. |
The two pressure coils of a single phase power factor meter have_________________? |
| A. | the same dimensions and the same number of turns |
| B. | the same dimension but different number of turns |
| C. | the same number of turns but different dimensions |
| D. | none of the above |
| Answer» B. the same dimension but different number of turns | |
| 15. |
The switch board instruments________________? |
| A. | should be mounted in vertical position |
| B. | should be mounted in horizontal position |
| C. | either A. or B. |
| D. | neither A. nor B. |
| Answer» B. should be mounted in horizontal position | |
| 16. |
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a _________________? |
| A. | single-phase winding |
| B. | two-phase winding |
| C. | three-phase winding |
| D. | any of the above |
| Answer» C. three-phase winding | |
| 17. |
The spring material used in a spring control device should have the following property? |
| A. | Should be non-magnetic |
| B. | Most be of low temperature co-efficient |
| C. | Should have low specific resistance |
| D. | Should not be subjected to fatigue |
| E. | All of the above |
| Answer» F. | |
| 18. |
The scale of a rectifier instrument is_________________? |
| A. | linear |
| B. | non-linear |
| C. | either A. or B. |
| D. | neither A. nor B. |
| Answer» B. non-linear | |
| 19. |
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be_____________? |
| A. | almost zero |
| B. | low |
| C. | high |
| D. | none of the above |
| Answer» D. none of the above | |
| 20. |
The rectifier instrument is not free from_______________? |
| A. | temperature error |
| B. | wave shape error |
| C. | frequency error |
| D. | all of the above |
| Answer» D. all of the above | |
| 21. |
The ratio of maximum displacement deviation to full scale deviation of the instrument is called_______________? |
| A. | static sensitivity |
| B. | dynamic deviation |
| C. | linearity |
| D. | precision or accuracy |
| Answer» D. precision or accuracy | |
| 22. |
The principle on which vector voltmeter is based is_____________? |
| A. | that it works on the principle of complex variation |
| B. | that it measures the response of linear ramp voltage |
| C. | same as digital meter |
| D. | that it measures the amplitude of a single at two points and at the same time measures their phase difference |
| Answer» E. | |
| 23. |
The pressure coil of a wattmeter should be connected on the supply side of the current coil when______________? |
| A. | load impedance is high |
| B. | load impedance is low |
| C. | supply voltage is low |
| D. | none of the above |
| Answer» B. load impedance is low | |
| 24. |
The power of a n-phase circuit can be measured by using a minimum of_______________? |
| A. | (n – 1) wattmeter elements |
| B. | n wattmeter elements |
| C. | (n + 1) wattmeter elements |
| D. | 2n wattmeter elements |
| Answer» B. n wattmeter elements | |
| 25. |
The power factor of a single phase load can be calculated if the instruments available are_____________? |
| A. | one voltmeter and one ammeter |
| B. | one voltmeter, one ammeter and one wattmeter |
| C. | one voltmeter, one ammeter and one energy meter |
| D. | any of the above |
| Answer» C. one voltmeter, one ammeter and one energy meter | |
| 26. |
The pointer of an indicating instrument should be______________? |
| A. | very light |
| B. | very heavy |
| C. | either A. or B. |
| D. | neither A. nor B. |
| Answer» B. very heavy | |
| 27. |
The operating voltage of a meggar is about_______________? |
| A. | 6 V |
| B. | 12 V |
| C. | 40 V |
| D. | 100 V |
| Answer» E. | |
| 28. |
The multiplier and the meter coil in a voltmeter are in________________? |
| A. | series |
| B. | parallel |
| C. | series-parallel |
| D. | none of the above |
| Answer» B. parallel | |
| 29. |
The household energy meter is_______________? |
| A. | an indicating instrument |
| B. | a recording instrument |
| C. | an integrating instrument |
| D. | none of the above |
| Answer» D. none of the above | |
| 30. |
The gravity controlled instrument has crowded scale because current is proportional to________________? |
| A. | balancing weight |
| B. | deflection angle |
| C. | sine of deflection angle |
| Answer» D. | |
| 31. |
The function of shunt in an ammeter is to______________? |
| A. | by pass the current |
| B. | increase the sensitivity of the ammeter |
| C. | increase the resistance of ammeter |
| D. | none of the above |
| Answer» B. increase the sensitivity of the ammeter | |
| 32. |
The electrical power to a meggar is provided by________________? |
| A. | battery |
| B. | permanent magnet D.C. generator |
| C. | AC. generator |
| D. | any of the above |
| Answer» C. AC. generator | |
| 33. |
The disc of an instrument using eddy current damping should be of________________? |
| A. | conducting and magnetic material |
| B. | non-conducting and magnetic material |
| C. | conducting and non-magnetic material |
| D. | none of the above |
| Answer» D. none of the above | |
| 34. |
The desirable static characteristics of a measuring system are______________? |
| A. | accuracy and reproducibility |
| B. | accuracy, sensitivity and reproducibility |
| C. | drift and dead zone |
| D. | static error |
| Answer» C. drift and dead zone | |
| 35. |
The chemical effect of current is used in ______________? |
| A. | D.C. ammeter hour meter |
| B. | D.C. ammeter |
| C. | D.C. energy meter |
| D. | none of the above |
| Answer» B. D.C. ammeter | |
| 36. |
The adjustment of position of shading bands, in an energy meter is done to provide______________? |
| A. | friction compensation |
| B. | creep compensation |
| C. | braking torque |
| D. | none of the above |
| Answer» B. creep compensation | |
| 37. |
Resistances can be measured with the help of_______________? |
| A. | wattmeters |
| B. | voltmeters |
| C. | ammeters |
| D. | ohmmeters and resistance bridges |
| E. | all of the above |
| Answer» E. all of the above | |
| 38. |
Operating torques in analogue instruments are_______________? |
| A. | deflecting and control |
| B. | deflecting and damping |
| C. | deflecting, control and damping |
| D. | vibration and balancing |
| Answer» D. vibration and balancing | |
| 39. |
Murray loop test can be used for location of________________? |
| A. | ground fault on a cable |
| B. | short circuit fault on a cable |
| C. | both the ground fault and the short-circuit fault |
| D. | none of the above |
| Answer» D. none of the above | |
| 40. |
Most sensitive galvanometer is_____________? |
| A. | elastic galvanometer |
| B. | vibration galvanometer |
| C. | Duddlb galvanometer |
| D. | spot ballistic galvanometer |
| Answer» E. | |
| 41. |
Most common form of A.C. meters met with in every day domestic and industrial installations are______________? |
| A. | mercury motor meters |
| B. | commutator motor meters |
| C. | induction type single phase energy meters |
| D. | all of the above |
| Answer» D. all of the above | |
| 42. |
It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________? |
| A. | D.C. voltmeter |
| B. | Ammeter and a known resistance |
| C. | D.C. potentiometer |
| D. | None of the above |
| Answer» D. None of the above | |
| 43. |
is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another_______________? |
| A. | Tangent galvanometer |
| B. | Meggar |
| C. | Current transformer |
| D. | None of the above |
| Answer» C. Current transformer | |
| 44. |
__________ instruments are those which measure the total quantity of electricity delivered in a particular time ? |
| A. | Absolute |
| B. | Indicating |
| C. | Recording |
| D. | Integrating |
| Answer» E. | |
| 45. |
Instrument transformers are_______________? |
| A. | potential transformers |
| B. | current transformers |
| C. | both A. and B. |
| D. | power transformers |
| Answer» D. power transformers | |
| 46. |
Induction type single phase energy meters measure electric energy in_______________? |
| A. | kW |
| B. | Wh |
| C. | kWh |
| D. | VAR |
| E. | None of the above |
| Answer» D. VAR | |
| 47. |
In Weston synchronoscope the moving coil is connected across______________? |
| A. | bus-bars |
| B. | incoming alternator |
| C. | fixed coils |
| D. | any of the above |
| Answer» B. incoming alternator | |
| 48. |
In order to achieve high accuracy, the slide wire of a potentiometer should be_______________? |
| A. | as long as possible |
| B. | as short as possible |
| C. | neither too small not too large |
| D. | very thick |
| Answer» B. as short as possible | |
| 49. |
In majority of instruments damping is provided by______________? |
| A. | fluid friction |
| B. | spring |
| C. | eddy currents |
| D. | all of the above |
| Answer» D. all of the above | |
| 50. |
In an energy meter braking torque is produced to________________? |
| A. | safe guard it against creep |
| B. | brake the instrument |
| C. | bring energy meter to stand still |
| D. | maintain steady speed and equal to driving torque |
| Answer» E. | |