Chapter 8 Electronics Instruments MCQs

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1. It is called third eye of electronics engineer
(A) Digital multi-meter
(B) Digital camera
(C) Oscilloscope
(D) All these

2. Oscilloscope is used
(A) To see the wave form of signal
(B) To measure the electrical quantities
(C) Both a & b
(D) To see the things that are far away

3. Oscilloscope cannot be used for
(A) None of these
(B) The measurements of electrical quantities
(C) The display of electrical signals on the screen in wave form
(D) The measurements of non electrical quantities

4. CRO is an abbreviation of
(A) Cathode Ray Oscilloscope
(B) Capacitor Recharging Operation
(C) Chemically Removing Operation
(D) None of these

5. An oscilloscope can be used for this purpose
(A) To find the voltage and time value of a signal
(B) To analyze the sharply oscillating signals by staying them on screen
(C) To study the state of transients
(D) All these

6. The sweep/time control knob of an oscilloscope is used
(A) To adjust the sweep time of the trace
(B) To set the vertical position of the signal
(C) To set the focus control
(D) To sweep out the signal from screen

7. On the front panel, there is a
(A) Screen
(B) Sweep time knob
(C) All these
(D) Signal focusing knob

8. To adjust the horizontal length of the signal, this knob of CRO is used
(A) Volts/div
(B) Sweep time/cm
(C) Focus
(D) Vertical position

9. This is found inside of an oscilloscope
(A) Vertical amplifier
(B) Sweep generator
(C) All these
(D) Horizontal amplifier

10. In an oscilloscope, this is used to deflect the trace beam horizontally
(A) Horizontal amplifier
(B) H plates
(C) Vertical amplifier
(D) Sweep amplifier

11. Horizontal signals in an oscilloscope than the vertical signals, are inherently
(A) Small
(B) Fast
(C) Strong
(D) Slow

12. Trigger circuit in a CRO is used to
(A) Start the electronic emission in cathode ray tube
(B) Make the power supply ON
(C) Start the sweep generator
(D) All these

13. The signal which is to be observed on CRO, is provided on
(A) V plates of CRO through horizontal amplifier
(B) H plates of CRO through vertical amplifier
(C) H plates of CRO through horizontal amplifier
(D) V plates of CRO through vertical amplifier

14. Main component (called its heart) of CRO is
(A) Sweep generator
(B) Vertical amplifier
(C) Cathode ray tube
(D) Trigger circuit

15. Output voltage of power supply of a CRO is
(A) +5 & +12V
(B) 95 & 220V
(C) All these
(D) 1600V

16. Purpose of electron gun assembly in a cathode ray tube is
(A) Wipe out the harmful electrons from CRO
(B) To prevent the generation of electrons
(C) To provide a high speed beam of electrons
(D) To concentrate the electrons at one point

17. Gun assembly of cathode ray tube consists of
(A) All these
(B) Accelerating and focusing anode
(C) Control grid
(D) Heater and a cathode

18. (In a CRO), The deflecting plates are the part of
(A) Gun assembly of CRT
(B) Focusing anode
(C) CRT
(D) None of these

19. Intensity of light spot on the screen of a CRO is controlled by
(A) All these
(B) Changing the heater voltage
(C) Changing the material of cathode
(D) Changing the –ve voltage of control grid

20. A thin layer of this material is applied on the inner side of cathode ray tube
(A) Zinc oxide
(B) Any of these
(C) Calcium tungstate
(D) Zinc artho silicate

21. The colour of light spot on CRO screen depends upon
(A) Intensity of electron beam
(B) Number of electrons
(C) Both a & b
(D) Type of fluorescent material

22. The number of horizontal and vertical squares on CRO screen are
(A) 4 & 6
(B) 24 & 30
(C) 12 & 20
(D) 8 & 10

23. The size of one square on CRO screen is
(A) 01 cm × 01 cm
(B) 01 cm × 02 cm
(C) 01 cm × 03 cm
(D) 02 cm × 02 cm

24. When there is no voltage on X & Y plates, the spot appears
(A) Upper side
(B) Lower side
(C) Upper right corner
(D) Centre of screen

25. If AC signal is on X plates only, trace will be
(A) AC signal on Y axis
(B) Bright spot at centre
(C) Bright straight horizontal trace
(D) Straight line on X axis

26. If AC voltage only on X plates, trace will be
(A) AC signal on X axis
(B) Straight line on X axis
(C) Spot on right side
(D) Spot at centre

27. To trace AC signal properly on CRO
(A) AC on both plates
(B) Sawtooth on X and AC on Y
(C) AC on X plates
(D) Sawtooth on both

28. Signal is sent to vertical plates through
(A) Sweep generator
(B) Delay line
(C) Both b & c
(D) Vertical amplifier

29. Dual trace oscilloscope uses
(A) Two screens
(B) One signal, two guns
(C) Two guns
(D) Two signals, one electron gun

30. Two signals are applied alternately by
(A) Switching circuit
(B) Trigger circuit
(C) Electron guns
(D) All

31. To get two traces
(A) Double beam
(B) Dual trace
(C) Both
(D) Scanning

32. Double beam oscilloscope uses
(A) Two vertical plates
(B) Two horizontal plates
(C) Two electron guns
(D) Both a & c

33. For ultra high frequency signals
(A) Scanning
(B) Impulse
(C) Storage
(D) Sampling

34. For transient signals
(A) Impulse type
(B) Scanning
(C) Sampling
(D) None

35. Property to retain signal
(A) Both
(B) High speed
(C) High persistence
(D) Fluorescence

36. Storage oscilloscope suitable for
(A) Low frequency
(B) High frequency
(C) Transient signals
(D) Computer storage

37. Writing gun used in
(A) Storage oscilloscope
(B) Scanning
(C) Sampling
(D) Digital

38. Extra screens used in
(A) Digital
(B) Double beam
(C) Storage oscilloscope
(D) Scanning

39. Output to computer
(A) Impulse
(B) Digital oscilloscope
(C) Sampling
(D) Storage

40. CRO directly measures
(A) Current
(B) DC voltage
(C) Resistance
(D) All

41. Bandwidth of sampling CRO
(A) Up to 12 GHz
(B) 15 KHz
(C) 20 GHz
(D) 50 Hz

42. Frequency measurement methods
(A) Time base
(B) Both
(C) Lissajous
(D) None

43. Cannot measure
(A) Phase shift
(B) Frequency
(C) Impedance
(D) None

44. Produces signals
(A) DC generator
(B) Signal generator
(C) AC generator
(D) None

45. Basic part of signal generator
(A) Oscillator
(B) Squarer
(C) Power amplifier
(D) None

46. Produces sinusoidal signal only
(A) Signal generator
(B) Oscillator
(C) Function generator
(D) All

47. Oscillator components
(A) Oscillatory circuit
(B) Amplifier
(C) Feedback
(D) All

48. Types of oscillator
(A) Phase shift
(B) Wien bridge
(C) Negative resistance
(D) All

49. Signal generator type
(A) AF
(B) RF
(C) HF
(D) Both a & b

50. Frequency range of AF generator
(A) 1–15 Hz
(B) 20 Hz–100 KHz
(C) 20–30 MHz
(D) 20 Hz–20 KHz