Measurement - -Electrical Engineering (MCQ) questions and answers
Measurement Mcq
ELECTRICALGENIE
1. The controlling torque in gravity controlled meter is propotional
to
2. The voltage of the circuit is measured by a voltmeter having
input impedence comparable with the output impedence of the circuit
thereby causing error in voltage measurement. This error may be
called as
3. The dead time of instrument refers to____
4. Error which may be variable both in magnitude and nature
(positive and negative) are classified as
5. Dynamometer type moving coil instruments are provided with
6. The function of measurement is/are
7. What is the smallest change in the input signal that can be
detected by an instrument called
8. The damping used in pemanent magnet type moving coil instrument
9. The difference between measured value and true value of a
measurand
10. The scale of moving iron instrument is
11. Which instrument has the lowest resistance
12. To incease the range of voltmeter
13. Swamping resistance is used to compensate error due to
14. Which one of the following type of instruments does not suffer
from error due to magnetic hysteresis
15. A voltmeter when connected a dc supply reads 124V. When a series
combination of the voltmeter and an unknown resistance X is
connected across the supply, the meter reads 4V. If the resistance
of voltmeter is 50Ω, the value of X is
16. When the multiplier is added to existing voltmeter for extending
its range, its electromagnetic damping
17. If current through the operating coil of moving iron instrument
is doubled, the operating force becomes
18. Moving coil and moving iron instruments can be distinguished by
observing its
19. Electrodynamometers are used extensively for the measurements of
______
20. What should be observed when connecting a voltmeter into a dc
circuit?
21.Voltmeter is a galvanometer with ______
22. A moving-iron meter will operate on
23. A generating voltmeter uses______
24. Which of the following is not a feature of MI type instruments?
25. Determine the value of current (in mA) for the full-scale
deflection of a voltmeter. when the sensitivity of the voltmeter is
50ohm/volt.
26. Determine the value of shunt resistance (in ohms) required to
convert a galvanometer into ammeter of reading upto 14A. When the
internal resistance of the galvanometer is 27ohms and the value of
current for full scale deflection is 0.5A.
27. How wil you convert galvanometer into ammeter?
28. Which one of the statement is not true about PMMC type
instrument?
29. A PMMC type voltmeter, having a full scale reading of 250V and
an internal resistance of 400KΩ, is connect with a series resistance
of 100KΩ. Calculate the sensitivity of the voltmeter.
30. What will happen to the operating torque of a moving iron
instrument, if current through the operating coil is halved?
31. The range of moving coil instrument having meter resistance of
6ohm is 0-50V. Find the value of multiplying factor of the series
resistance, if its full scale deflection current is 5A.
32. A permanent magnet moving coil instrument has a coil of
diamension 10mm*20mm. The flux density in the air gap is 2*10-3
Wb/m2 and the spring constant is 0.25*10-6 Nm/rad. If the current of
10mA is flowing through the coil, then calculate the number of turns
required to produce an angular deflection of 60 degrees.
33. If zero centered voltmeter has a scale from -5V to +5V, then the
span of it is
34. In a indicating instrument, the control torque produce by the
spring is propotional to
35. ______ is used for temprature measurement
36. Which one of the following types of watt-hour meter is used only
in AC circuits?
37. The analog meter will never have ____
38. Which of the following meters is most accurate instrument for
measuring AC signals with frequencies lower than 200Hz?
39. The accuracy of d'Arsonal movements used in common laboratory
meters is about____ of the full-scale reading.
40. Megger is a instrument to measure
41. Which one of the following is not a null method of measurement?
42. When a wheatstone bridge is balanced, the galvanometer reads
43. To minimize the error due to the lead and contact resistance,
low resistance used in electric measurement work are provided with
44. An industrial annalyzer is not suitable for measuring which of
the following?
45. Which one of the following is measure with a wheatstone bridge?
46. Speed of megger is kept at
47. A static combination of control coil and compensating coil is
used in megger to minimize the effect of
48. The operation of megger is based on which of the following?
49. Insulation resistance is expressed in
50. Extension of moving iron ammeter range can be done by using
51. When a multipler is added to an exixting voltmeter for extending
its range, its electromagnetic damping
52. Resistance temprature coefficient of copper at 20 degree celcius
is
53. The SI unit of conductivity is
54. A piece of oil soaked paper has been inserted between the plates
of a parallel plate capacitor. Then the potential difference between
the plates is
55. In a domastic cake baking oven, the temprature is controlled by
56. A capacitor can be represented by a capacitance and a resistance
in parallel. For a good capacitor, the parallel resistance is
57. A coil with large distribued capacitance has a
58. High frequency and impulse currents are measured using
59. Mica capacitor are characterized by all of the following
except_______
60. Which of the following capacitors of identicle rating will have
the smallest diamensions?
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