1. Moving Iron instruments can be used on: ac only dc only ac and dc both none of the options 2. A voltmeter should have high internal resistance a sensitive amplifier low internal resistance electrostatic plates 3. McLeod gauge used for measurement of low pressure high pressure very high pressure pressure 4. An ammeter is a absolute instrument integrating instrument recording instrument secondary instrument 5. A megger indicates infinity when test terminals are open-circuited. This is because: no current flows through the compensating winding no current flows through the current coil current does not flow through current coil and pressure coil no current flows through the pressure coil 6. The adjustment of position of shading bands, in an energy meter is done to provide braking torque friction compensation creep compensation none of the options 7. The change in the direction of a compass needle, when a current carrying wire is brought near, is called electromagnetic deflection electroscopic force electrostatic force magnetic force 8. The deflection torque can be produced by: spring control air friction gravity control magneitcally 9. _____ instruments are those which measure the total quantity of electricity delivered in a particular time. recording integrating indicating absolute 10. The use of _____ instruments is merely confined within laboratories as standardizing instruments. recording absolute indicating integrating 11. Chemical effect is used for the operation of: voltmeter ammeter ampere hour meter kwh meter 12. Dipsticks are used for the pressure measurement displacement measurement flow measurement level measurement 13. The damping force acts on the moving system of an indicating instruments only when it is stationary near its full scale deflection moving just staring to move 14. Which of the following are integrating instruments ? wattmeters ammeters ampere-hour and watt-hour meters voltmeters 15. The major advantage of electromagnet type meter over a permanent magnet meter is the permanent magnet meter has a more sluggish coil the electromagnet meter costs much less the electromagnet meter need not be aligned with the earth's magnetic field the electromagnet meter is more rugged 16. How do passive transducers develop electrical signals using external source using a transformer using internal source using a diode 17. Various adjustments in an energy meter include light load or friction overload and voltage compensation lag and creep all of the options 18. A moving iron ammeter coil has few turns of thick wire in order to have: effective damping large scale high sensitivity low resistance and large current carrying capacity 19. A transducer must be quick in response slow in response medium in response very slow in response 20. Average resistance of human body is: 2000 ohms 500 ohms 1000 ohms 1500 ohms 21. In an energymeter braking torque is produced to bring energy meter to stand still brake the instrument safe guard it against creep maintain steady speed and equal to driving torque 22. A galvanometer can be used for measuring current and voltage of a circuit by: shunt for measuring current and high resistance in series for voltage connecting high value of resistance in series only without shunt and series resistance shunt only 23. Which of the following essential features is possessed by an indicating instrument ? deflecting device controlling device damping device all of the options 24. Electrical transducers generate physical signals chemical signals biological signals electrical signals 25. Measurement range of a voltmeter can be extended by using: low series resistance low shunt resistance high current resistance high series resistance 26. Ground resistance should be designed such that: grounding resistance should be always zero grounding resistance should be as high as possible grounding resistance should be as low as possible none of the options 27. The energy consumption of MI instrument as compared to MC instrument is: very small same more less 28. The vale of resistance of an earthing electrode depends upon specific resistance of soil depth to which electrode is driven into earth shape and material of the electrode all of the options. 29. Swamping of resistance is used to compensate error due to: temperature variations stray magnetic field large supply variations none of the options 30. The ratio of maximum displacement deviation to full scale deviation of the instrument is called linearity dynamic deviation precision or accuracy static sensitivity 31. For increasing the range of an ammeter, connect: a low value resistance in parallel with the ammeter coil a high value resistance in parallel with the ammeter coil a low value resistance in series with the ammeter coil a high value resistance in series with the ammeter coil 32. Earth wire or ground wire is made of: galvanized steel aluminium copper iron 33. Maxwell's inductance capacitance bridge is used for measurement of inductance of: low q coils medium q coils low and medium q coils none of the options. 34. LVDT used for measurement of voltage temperature displacement measurement resistance 35. Potentiometer is an __ instrument: recording indicating calibrating comparison 36. In a portable instrument, the controlling torque is provided by eddy currents spring gravity all of the options 37. What is the principle of operation of LVDT? permanence mutual inductance self-inductance reluctance 38. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly deflecting controlling damping any of the above 39. In ultrasonic level gauge, the ultrasonic source is placed at the bottom of the vessel containing the liquid middle of the vessel containing the liquid far from the vessel containing the liquid top of the vessel containing the liquid 40. Electrostatic type instruments are mainly used for measurement of high voltages heavy currents low currents low voltages 41. The objective of earthing or grounding is: to provide as low resistance possible to the ground to provide as high resistance possible to the ground to provide flow of positive, negative and zero sequence currents none of the options 42. In spring control instruments, controlling torque: cannot be adjusted easily remains the same varies with the load can be adjusted easily 43. The ratio and phase angle errors in potential transformer may be reduced by increasing the exciting current increasing the resistance and leakage reactance in the transformer by not employing turns compensation none of the options 44. The spring material used in a spring control device should have the following property. should be non-magnetic should have low specific resistance most be of low temperature co-efficient all of the options 45. Moving coil instruments are: induction type dynamometer type permanent magnet and dynamometer type permanent magnet type 46. In majority of instruments damping is provided by fluid friction ddy currents spring all of the optionse 47. Deflection system of a CRT consists of 2 plates 6 plates 8 plates 4 plates 48. Which of the following bridge is frequency sensitive: anderson bridge wheatstone bridge wien bridge maxwell bridge 49. The desirable static characteristics of a measuring system are drift and dead zone static error accuracy, sensitivity and reproducibility accuracy and reproducibility 50. The wheatstone bridge cant be used for precision measurements because errors are introduce into on account of : thermo electric emf contact resistances resistance of connecting leads all of the options. 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