This Portion of Electrical and Electronic Instrumentation contains Display Devices and Recorders MCQs (Multiple Choice Questions and Answers) / Objective Type Questions and Answers.

This Section covers below lists of topics.

  1. Electrical Indicating instruments
  2. Digital instruments
  3. Electronic Counters
  4. Digital Display methods
  5. Segmental Displays
  6. Dot Matrices
  7. Rear Projection Display
  8. Mixie Tube
  9. Light Emmiting Diodes (LED)
  10. Liquid Crystal Diodes (LCD)
  11. Display Systems
  12. Decimal Decoders
  13. BCD to 7-segments Converter
  14. BCD to Dot matrix Converter
  15. Digital Frequency Meter
  16. High Frequency Measurements
  17. Period Measurement
  18. Ratio and Multiple Ration Measurements
  19. Time interval Measurements
  20. Universal Counter Timer
  21. Digital Voltmeter(DMVs)
  22. Digital, Ramp type, Integrating Type, Potentiometric Type Digital Voltmeter
  23. Recorders
  24. Analog Recorders
  25. Graphic Recorders
  26. Strip Chart Recorders
  27. Galvanometer Type Recorders
  28. Null Type Recorders
  29. Potentiometric Recorders
  30. Single Point Recorders
  31. Multi Point Recorders
  32. XY Recorders
  33. Ultraviolet Recorders
  34. Magnetic Tape Recorders
  35. Direct Recording
  36. Frequency Modulated (FM) Recording
  37. Pulse Duration Modulation (PDM) Recording
  38. Digital Tape Recorders

 

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1. If an information is required to be stored over a short interval of time

  • A single number/devices should be used
  • A storage type oscilloscope should be used
  • A CRO with photographic equipment should be used
  • A direct writing recorder of a magnetic tape recorder should be used

2. The machine interpretable outputs from an analog transducer can had from

  • Magnetic tapes
  • Punched cards and tapes
  • Telytypewriter
  • All the above.

3. Digital instruments have input impedance of the order of

  • Ω
  • kΩ
  • MΩ
  • mΩ

4. if four flip flops are connected in cascade, they serve as

  • 2:1 scalar
  • 4:1 scalar
  • 8:1 scalar
  • 16:1 scalar

5. The LEDs, or their display require

  • A voltage of 1.2V and a current of 20 mA
  • A voltage of 25V and a current of 20 mA
  • A voltage of 1.2V and a current of 100 mA
  • A voltage of 25V and a current of 100 mA.

6. Switching time of LEDs is of the order of

  • 1 s
  • 1 ms
  • 1 µs
  • 1 ns

7. LED emit light

  • Only in red color
  • Only in yellow color
  • Only in green color
  • In red, green, yellow and amber color.

8. An LCD requires a power of______ To light up one segment of a seven segmented display system

  • 20 W
  • 20 mW
  • 20 µW
  • 20 nW

9. The turn on and turn off times of a LCD are of the order of

  • 1 s
  • 1 ms
  • 10 ms
  • 10 ns

10. The power requirement of LED is

  • 40 mW per numeral
  • 40 µW per numeral
  • 10 W per numeral
  • 10 µW per numeral

11. A Nixie tube requires

  • 10 cathodes
  • 14 cathodes
  • 15 cathodes
  • 20 cathodes

12. A Nixie tube requires

  • 150 V – 220 V
  • 100 V – 150 V
  • 150 mV – 220 mV
  • 100 mV – 150 mV

13. In a  digital frequency meter, the Schmitt trigger is uses for

  • Sinusoidal waveforms into rectangular pulses
  • Scaling of sinusoidal waveforms
  • Providing time base
  • None of the above.

14. Pulses of frequency 1 MHz are applied to the time base selector of a digital frequency meter which consists of 6 frequency dividers, each dividing the incoming frequency by a factor of 10. What is the time base setting at the output of 4th frequency divisor?

  • 1 ms
  • 10 ms
  • 100 ms
  • 1 ms

15. Period measurement is done in frequency meters for achieving high accuracy in the case of

  • High frequencies
  • Medium frequencies
  • D.C
  • Low frequencies

16. In a digital frequency meter, the multi-period average mode of operation, the main gates is held open for more than one period of the unknown signal

  • So that the period is extended in order that counters show more digits thereby an increased accuracy is obtained
  • So that resolution is increased
  • So that the range of the instrument is extended
  • So that errors on account of dead time are eliminated

17. A digital voltmeter uses an A/D converter which needs a start pulse, use an analog comparator and has a relatively fixed conversion time independent of the applied voltage. The A/D converter is

  • Successive approximation converter
  • Digital ramp converter
  • Divial slope converter
  • All the above.

18. X-Y recorders

  • Record one quantity with respect to another quantity
  • Record one quantity on x- axis with respect to time on Y-axis
  • Record one quantity on Y-axis with respect to time on X-axis
  • None of the above.

19. In a direct recording type magnetic system, the reproducing head and amplifier characteristics are

  • – 6 db/octave, + 6 db/octave
  • – 6 db/octave, + 20 db/decade
  • + 6 db/octave, + -6 db/octave
  • – 20 db/decade, + 20 db/decade

20. The advantage of F.M magnetic tape recording are

  • It can record from d.c to several kHz
  • It is free from dropout effect
  • It is independent from amplitude variations and accurately reproduces the waveform of input signal
  • All the above.

21. A strip chart recorder is a/an

  • analog recorder
  • magnetic tape recorder
  • oscillographic recorder
  • none of the above

22. Printing mechanism of a FAX machine is of

  • thermal type
  • impact type
  • electrostatic type
  • optical type

23. Which is not the function of data loggers?

  • Display
  • Online analysis
  • Reporting
  • Control

24. The bandwidth of a magnetic tape recorder is

  • higher than electronic recorder
  • higher than strip chart recorder
  • lower than strip chart recorder
  • higher than ultraviolet recorder

25. Power consumption of an LED display is

  • higher than LCD display
  • lower than LCD display
  • almost equal to LCD display
  • Approximately two lines higher than same size LCD

26. In a CRT, the electron beam is deflected by

  • electric field
  • magnetic field
  • both magnetic and electric field
  • gravitational field

27. Servo mechanism is used in

  • potentiometric type recorder
  • galvanometric type recorder
  • magnetic tape type recorder
  • ultraviolet recorder

28. The response time of CRT display is

  • higher that LCD display
  • lower than LCD display
  • higher than plasma display
  • lower than plasma display

29. The gas used in plasma screens is a mixture of

  • nitrogen and oxygen
  • nitrogen and xenon
  • argon and nitrogen
  • argon and xenon

30. Time scale of a strip chart recorder is controlled by

  • controlling speed of the chart paper
  • controlling the stylus drive mechanism
  • controlling the range selector
  • controlling the stylus

  

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