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measurement part 2

Measurement [Part 02] - Electrical Engineering (MCQ) questions and answers

ELECTRICALGENIE

1.The use of _____ instruments is merely confined within laboratories as standardizing instruments.






Explain:- We can classify the instruments into two types

Absolute Instruments:

These instruments give the magnitude of the quantity under measurements in terms of physical constants of the instrument.
There is no necessity of calibrating or comparing with other instruments.
Tangent Galvanometer and Rayleigh’s current balance are example of this class
Secondary Instruments:

These instruments are so constructed that the quantity being measured can only be measured by observing the output indicated by the instrument.
These instruments are calibrated by comparison with an absolute instrument or any other secondary instrument which has already been calibrated against an absolute instrument.
A voltmeter, a glass thermometer and a pressure gauge are typical examples of secondary instruments

Working with absolute instruments for routine work is time consuming. Therefore, secondary instruments are most commonly used. Absolute instruments are seldom used except in standard institutions and laboratories while secondary instruments find usage almost in every sphere of measurement.

2. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?





3. _____ instruments are those which measure the total quantity of electricity delivered in a particular time.





4. Which of the following are integrating instruments ?





5.Resistances can be measured with the help of





6. Which of the following essential features is possessed by an indicating instrument ?





7. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly





8. The spring material used in a spring control device should have the following property.






9. Which of the following properties a damping oil must possess ?






10.A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.





11. A moving-coil permanent-magnet instrument can be used as flux-meter





12. Which of the following devices may be used for extending the range of instruments ?






13. An induction meter can handle current up to





14. For handling greater currents induction wattmeters are used in conjunction with





15. Induction type single phase energy meters measure electric energy in





16. Most common form of A.C. meters met with in every day domestic and industrial installations are





17. Which of the following meters are not used on D.C. circuits





18. A potentiometer may be used for






19. ________________is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another





20.The pointer of an indicating instrument should be





21.The chemical effect of current is used in





22. In majority of instruments damping is provided by





23. An ammeter is a





24. In a portable instrument, the controlling torque is provided by





25.The disc of an instrument using eddy current damping should be of





26. The function of shunt in an ammeter is to





27. The scale of a rectifier instrument is





28. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be





29. The pressure coil of a wattmeter should be connected on the supply side of the current coil when





30. In a low power factor wattmeter the pressure coil is connected





31. In a low power factor wattmeter the compensating coil is connected





32.In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was





33. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be





34. The adjustment of position of shading bands, in an energy meter is done to provide





35. An ohmmeter is a





36. 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





37. For measuring a very high resistance we should use





38. In a meggar controlling torque is provided by





39. The electrical power to a meggar is provided by





40. The operating voltage of a meggar is about





41.Murray loop test can be used for location of





42. Which of the following devices should be used for accurate measurement of low D.C. voltage ?





43.It is required to measure the true open circuit e.m.f. of a battery. The best device is





44. A voltage of about 200 V can be measured





45.A direct current can be measured by





46. To measure a resistance with the help of a potentiometer it is





47. A phase shifting transformer is used in conjunction with





48. Basically a potentiometer is a device for





49. In order to achieve high accuracy, the slide wire of a potentiometer should be





50. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken





51. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a





52. In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be





53. A universal RLC bridge uses





54. For measurements on high voltage capacitors, the suitable bridge is





55. In an Anderson bridge, the unknown inductance is measured in terms of





56. Wagner earthing device is used to eliminate errors due to





57. For measurement of mutual inductance we can use





58. For measurement of inductance having high value, we should use





59. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is





60. In a Schering bridge the potential of the detector above earth potential is





61.To avoid the effect of stray magnetic field in A.C. bridges we can use





62. If an inductance is connected in one arm of bridge and resistances in the remaining three arms





63. A power factor meter has





64. The two pressure coils of a single phase power factor meter have





65.In a single phase power factor meter the phase difference between the currents in the two pressure coils is





66. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at





67. In a vibrating reed frequency meter the natural frequencies of two adjacent reads have a difference of





68. In a Weston frequency meter, the magnetic axes of the two fixed coils are





69. A Weston frequency meter is





70.A Weston synchronoscope is a





71. In a Weston synchronoscope, the fixed coils are connected across





72. In Weston synchronoscope the moving coil is connected across





73. The power factor of a single phase load can be calculated if the instruments available are





74. The desirable static characteristics of a measuring system are





75.The ratio of maximum displacement deviation to full scale deviation of the instrument is called





76. Systematic errors are





77. Standard resistor is made from





78.Commonly used standard capacitor is





79. Operating torques in analogue instruments are





80. Commonly used instruments in power system measurement are





81.Damping of the Ballistic galvanometer is made small to





82. If an instrument has cramped scale for larger values, then it follows





83. Volt box is a component to





84. E.m.f. of a Weston cell is accurately measured by





85.A sensitive galvanometer produces large deflection for a





86. A multirange instrument has





87.The gravity controlled instrument has crowded scale because current is proportional to





88. The rectifier instrument is not free from





89. Alternating current is measured by





90. Most sensitive galvanometer is





91.An instrument transformer is used to extend the range of





92. Wattmeter cannot be designed on the principle of





93. In an energy meter braking torque is produced to





94.Various adjustments in an energy meter include






95. The power of a n-phase circuit can be measured by using a minimum of





96. Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to





97. The principle on which vector voltmeter is based is





98. Which of the following is measured by using a vector voltmeter ?





99. To measure radio frequency, the suitable frequency meter is





100.In a Balanced three -phase load,each phase has power equal to the





#measurement part 2

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