Home/Quiz/Measuring Instruments Measuring Instruments Welcome to Electronics Quiz 1. In PMMC type instrument, voltmeter loading can be greatly reduce by using a BJT Collector follower BJT emitter follower FET emitter follower SCR resistor follower 2. In a PMMC type ammeter, if the full-scale meter current is known, the sensitivity can be determined as Square of full-scale current Reciprocal of full-scale current Square root of full-scale current Cube root of full-scale current 3. The errors committed by a person in the measurement are Gross errors Random Errors Instrumental Errors Environmental Errors 4. Instrument used for measurement of quantity of electricity (charge) passed through it is known as Megger D’Arsonval Galvanometer Ballistic Galvanometer Ohm meter 5. A vertical spindle is generally preferred to a horizontal one in Ammeters and Voltmeters from the point of view of Large friction torque Small friction torque No friction Torque Allowable friction torque 6. In an instrument the smallest measurable input is known as Threshold Resolution Dead zone Precision 7. A reading is recorded as 68.0 ohm. The reading has Three significant figures One significant figures Two significant figures Four significant figures 8. The following is not used in Active display CRT Gas discharge plasma LED’s LCD’s 9. A closed lissajous pattern is shown in figure. Find the ratio of frequencies of vertical and horizontal signals 2/3 3/2 1/3 3/1 10. _________ is the measurement of reproducibility of the measurements. It is used in the measurements to describe the consistency of results sensitivity stability Accuracy Precision 11. Analog recorders may be broadly classified into three categories, namely Graphic recorders, oscillographic recorders and magnetic tape recorders strip chart recorders, circular chart recorders and x-y recorders Potentiometer type recorders, bridge type recorders and LVDT recorders Galvanometer recorders, CRT recorders and tape recorders 12. The time base of CRO is developed by Square waveform Saw tooth Waveform Sine Waveform Output from a built I clock 13. Phantom loading for testing of energy meter is used to isolate the current and potential circuit to reduce power loss during testing for a meter having low current rating to test meter having a large current rating for which loads may not be available 14. ________ provide dimensional standards of length for industry Dial gauge Micrometer Screw Gauge blocks Vernier Calliper 15. In an induction type energy meter, compensation for the static fraction is provided by shading bands which are actuated by to provide a constant torque irrespective of load lag circuit drilling holes on discs none options 16. What will happen if a voltmeter is connected like an ammeter in series to the load? the meter will burn out the measurement will be too high an inadmissibly high current will flow there will be almost no current in the circuit 17. A certain meter has a sensitivity of 50,000 ohm/V. the current required to deflect the meter movement to full scale will be 5 μA 10μA 20 μA 50 μA 18. Hysteresis in an instrument means repeatability of the instrument reliability of the instrument change in same reading when the input is first increased and then decreased the inaccuracy due to change in temperature 19. _________ is an example for digital instruments Float type petrol tank level indicator Pressure measuring device Deflection type of pressure gauge Revolution counter 20. The instrument transformers ate categorized into ________ types One Two Three Four 1 out of 20 Thank You Time's up
