Electronics Instruments - Multiple Choice Questions and Answer

Electronics Instruments - Multiple Choice Questions and Answer Points : Electronics Instruments, electrical, mcqs, evaluation, judgment, gauging, rating, consideration, analysis, examination, workup, test, review, objective type question and answer, multiple choice questions and answer 1. The meters using some sort of electromechanical mechanism and its readout is displayed by pointer is called:
a) Digital meter
(b) Analog meter
(c) Display unit
(d) None of above

2. Several different people viewing the same meter will usually record the same reading, the meter will be.
(a) Signal Generator
(b) Analog meter
(c) Digital meter
(d) All of above

3. Digital meters work on the principle of:
(a) Quantization
(b) Induction
(c) Repulsion
(d) Jhermocouple

4. A digital meter has disadvantage like:
(a) Its construction is complex
(b) Mechanically weak
(c) It show discontinuous operation
(d) All of above

5. Main unit of digital meter is:
(a) Signal preparation unit
(b) Analog to digital conversion unit
(c) Display unit
(d) All of above

6. Analog to digital conversion unit is one of the units of
(a) Computer
(b) Digital meter
(c) Analog meter
(d) Both (a) & (b)

7. Is a type of display unit
(a) Segmental
(b) Dot matrix
(c) Diode
(d) Both (a)&(b)

8. In a digital frequency meter the time is counted by
(a) Electronic counter
(b) Stop watch
(c) Synchronous motor
(d) None of above

9. While measuring current by a digital ammeter, the unknown current is passed through:
(a) Unknown resistor
(b) Known resistor
(c) Known inductor
(d) Known Capacitor

10. A cascaded transistor voltmeter uses:
(a) Two transistor
(b) One transistor
(c) Three transistor
(d) None of above

11. A TVM using FET uses a type of meter for its readout:
(a) Moving iron type
(b) Induction type
(c) PMMC type
(d) Jhermal type

12. An oscillator is the basic element of all ac signal sources and generates sinusoidal signal of
(a) Known frequency
(b) Known frequency and amplitude
(c) Unknown frequency and amplitude
(d) Unknown frequency

13. Modulation used in the communications industry is
(a) AM
(b) FM
(c) None of above
(d) Both (a) & (b)

14. A typical frequency range of R.F signal generator is
(a) 50 KHz to 110 MHz
(b) 50 Hz to 110 KHz
(c) 50 MHz to 110 KHz
(d) None of above

15. Modulation level can be adjusted in R.F signal generator upto:
(a) 100%
(b) 90%
(c) 95%
(d) 80%

16. The audio-frequency range of typical AF signal generator is
(a) 20 Hz to 200 KHz
(b) 200 Hzto2OKHz
(c) 20 Hz to 20 KHz
(d) None of above

17. The principal circuit of an AF signal generator is a
(a) Constant frequency audio oscillator
(b) Variable frequency audio oscillator
(c) Variable frequency radio — oscillator
(d) None of above

18. While using signal generator to test receivers, the frequency accuracy and stability are
(a) Important
(b) Not Important
(c) Very Important
(d) All of above

19. It is one of the most popular type of oscillators used in audio and sub-audio frequency.
(a) Wien,s Bridge AF oscillator
(b) Phase shift AF oscillator
(c) Both (a) & (b)
(d) Neither (a) Nor (b)

20. A function generator is a multipurpose signal source, it can generate:
(a) Square wave
(b) Triangular wave
(c) Sine wave
(d) All of above

21. Inductance and capacitance can be measured by:
(a) Impedance Bridge
(b) Kelvin Double Bridge
(c) Signal Generator
(d) Both (a)&(c)

22. For measurement of unknown valve of capacitance and inductance, we need.
(a) AF signal generator
(b) Oscilloscope
(c) A known resistor
(d) All of above

23. An advantage of oscilloscope over multimeter is that:
(a) We can measure accurate value of voltage
(b) We can measure accurate value of current
(c) We can see the wave shape of voltage
(d) We can measure accurate resistance

24. The graticule of an oscilloscope, which has a grid pattern graduated in
(a) Centimeters
(b) Square centimeters
(c) Millimeters
(d) None of these

25. The voltage required for the heater of the electron gun for generation of electron beam is
(a) High
(b) Low
(c) Very High
(d) Very Low

26. One pair of deflection plates, which is mounted vertically and deflects the beam in the horizontal or X- direction are called
(a) X-plates
(b) Y-plates
(c) X-plates
(d) Y-t plates

27. A crystal line material which has property of emitting light when exposed to radiation is called
(a) Phosphorous
(b) Phosphor
(c) LED
(d) LCD

28. The input sensitivity of many CR0 is of the order of “a”.
(a) Few milli-Volts ;per division
(b) 100mv per division
(c) 100 V per division
(d) 10(X) V per division

29. The knobs for controlling the position of spot are:
(a) Four
(b) Two
(c) Three
(d) One

30. In the electron gun of a CRT middle anode is kept at lower potential with respect to other two anodes it acts like:
(a) Lens
(b) Electrostatic lens
(c) Electrostatic mirror
(d) Both (a) & (b)

31. In many cases it becomes necessary to compare one signal with an other, we use:
(a) Multiple beam oscilloscope
(b) Multiple trace oscilloscope
(c) Scanning oscilloscope
(d) Storage type oscilloscope

32. In digital oscilloscopes in contrast to analog oscilloscope, the data is stored in memory in:
(a) Binary numbers
(b) BCD
(c) Decimal numbers
(d) Both (b) &(c)


33. If the vertical sensitivity is set to 0.5 Volt per division and wave occupies 4 divisions then peak -to- peak voltage is
(a) 4 Volt
(b) 5 Volt
(c) 20 Volt
(d) 2 Volt