Electrical measurements MCQ Quiz Hub

1. Which oscilloscope is used in a digital storage oscilloscope?
multi trace
dual trace
modern
conventional

2. Power requirement is _________
low
high
medium
zero

3. The stored image can be displayed ______
for a limited time
for infinite time
for zero time
for an intermediate time

4. The analog signal is digitized using _____
D/A converter
Oscillator
A/D converter
Rectifier

5. How is the data displayed?
through a screen
through a computer
through an FPGA
through a microprocessor

6. A digital storage oscilloscope has _____
3 modes
2 modes
4 modes
5 modes

7. By making use of a CRO _____
many characteristics of a signal can be measured
only a few characteristics of a signal can be measured
no characteristics of a signal can be measured
signal can only be displayed

8. How is the waveform adjusted?
by adjusting the voltage
through shift controls
by reducing the current
by means of a galvanometer

9. How is error in measurement reduced?
using r.m.s value
using absolute value
using peak to peak value
using a voltmeter

10. CRO is voltage measuring device.
True
False
all of the above
None of the mentioned

11. Period of a waveform is obtained by which of the following relation?
T = number of divisions occupied by 1 cycle×(time)
T = number of divisions occupied by 1 cycle×(1⁄division)
T = number of divisions occupied by 1 cycle×(time⁄division)
T = number of divisions occupied by 1 cycle

12. How is frequency related to time period?
square proportional
not related
directly proportional
inversely proportional

13. How many types of acquisition methods are there in a digital storage oscilloscope?
3
6
2
4

14. An oscilloscope with 20 to 50 GHz needs a slow speed.
True
False
all of the above
None of the mentioned

15. In which method of acquisition, pretrigger event is lost?
Real time sampling
Random repetitive sampling
Sequential repetitive sampling
Analog Sampling

16. In Sequential repetitive sampling how many samples are captured?
ten
five
two
one

17. In Real time sampling, bandwidth is limited.
True
False
all of the above
None of the mentioned

18. What plays an important role in Real time sampling?
small memory and fast sampling
large memory and slow sampling
large memory and fast sampling
small memory and slow sampling

19. A single trigger event can capture how many samples in Real time sampling?
1
nm/2
2nm
nm

20. In Real time sampling what is the 3 dB bandwidth?
fs/4
fs/8
2fs
fs

21. CRO is used for measurement of _______
AC as well as DC current
AC current only
DC current only
AC power only

22. CRO is used in a radar for ______
studying the pattern of flights
visualizing a target
measuring voltage
determining the distance between source and destination

23. In radio applications, CRO is used for measuring ____
audio frequency range
a narrow range of frequencies
a wide range of frequencies
radio frequency range

24. In medical applications CRO can be used for ______
measuring the heart beats
monitoring the brain
improving the nervous system functioning
displaying cardiograms

25. CRO is used for many purposes in the industry.
True
False
all of the above
None of the mentioned

26. A CRO can’t be used in transmission lines.
True
False
all of the above
None of the mentioned

27. Curve tracers use CRO in _____
diodes
passive devices
active devices
op amps

28. A CRO is used in check _____
op amps
resistors
voltage
capacitance, inductance and diodes

29. A CRO is used in labs for _____
frequency measurement
voltage measurement
current measurement
resistance measurement

30. A recorder is a device ____
An indicating instrument which displays a time-varying signal
Whose function is to record the value of the quantity as it is being measured
Which records electrical and non-electrical quantities or relates two signals to each other as a function of time
Which records the value of the quantity measured as well as the electrical and non-electrical quantities as a function of time

31. In a dual slop integrating type digital voltmeter, the firs integrating is carried out for 10 periods of the supply frequency of 50 Hz. If the reference voltage used is 2 V, the total conversion time for an input of 1 V is?
0.01 s
0.05 s
0.1 s
1 s

32. The source of emission of electrons in a circuit is ________
p-n junction diode
a barium and strontium oxide coated cathode
accelerating anode
post-accelerating anode

33. A CRO can display ____
AC signals
DC signals
Both AC and DC signals
Time-invariant signals

34. X and Y plates of a CRO are connected to unequal voltages of equal frequency with phase shift of 90°. The Lissajous figure on the screen will be?
Circle
Straight line
Ellipse
Figure of eight

35. To the Y input of a CRO, we feed a signal defined by 10sin100t, to the X-input, we feed signal 10cos100t. The gain for both X channel and Y channel is the same, the screen will show?
Sinusoidal signal
A straight line
An ellipse
A circle

36. A CRO uses ______
Electromagnetic focusing
Electrostatic focusing
Both Electrostatic and Electromagnetic focusing
No focusing technique

37. The two inputs of a CRO are fed with two stationary periodic signals. The figure changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this.
The signals are not sinusoidal in nature
The amplitudes of the signals are very close but not equal
The signals are sinusoidal with their frequencies very close but not equal
There is a constant but small phase difference between the signals

38. An oscilloscope indicates ________
The peak to peak value of the voltage
DC value of the voltage
Rms value
Average value

39. What is a data acquisition system?
system used for data processing, conversion and transmission
accepts data as an input
removes noise
boosts the signal

40. A typical data acquisition system consists of _____
op amps
sensors
rectifiers
transistors

41. The data acquisition system implies input data collection ______
in mixed signal form
in analog form
in digital form
in the form of binary codes

42. Data measurement systems are _______
not flexible
rigid
less flexible
more flexible

43. Modern electronic instrumentation system is not complex.
True
False
all of the above
None of the mentioned

44. The data acquisition system can have any speed.
True
False
all of the above
None of the mentioned

45. A data acquisition system provides _______
partial communication
ineffective communication
effective communication
complete communication

46. Data acquisition system can be used in ______
10 ways
8 ways
4 ways
2 ways

47. Data acquisition system is mainly classified into ______
2 types
4 types
6 types
8 types

48. Transducer is used to convert a _______
physical quantity into an electrical signal
electrical signal into a physical quantity
physical quantity into a mechanical quantity
physical quantity into a chemical quantity

49. Transducer produces a _______
proportional current
proportional voltage
proportional resistance
proportional power

50. Sensors produce frequency which is counted by ______
a chemical counter
a mechanical counter
an electronic counter
a basic counter

51. Signal conditioner is used for _____
attenuating the voltage
maintaining a constant voltage
keeping the voltage zero
boosting the voltage

52. A multiplexer is used for ______
accepting multiple inputs
accepting single input
accepting multiple outputs
accepting single output

53. Multiplexers are used when the distance between source and destination is less.
True
False
all of the above
None of the mentioned

54. Output signal is captured using _____
CRO
plotter
recorder
voltmeter

55. Analog computers have _______
zero cost
intermediate cost
more cost
less cost