This is the Multiples Choice Questions Part 2 of the Series in Tests and Measurements as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.
MCQ Topic Outline included in ECE Board Exam Syllabi
- MCQ in Volt, Ohm, Ammeter (analog/digital)
- MCQ in R-L-Z bridges
- MCQ in Oscilloscope
- MCQ in Cable Testers
- MCQ in RF Meters
- MCQ in Signal Generators (audio, RF, video)
- MCQ in Noise Generators
- MCQ in Power
- MCQ in Reflectometer
- MCQ in Grid dip meter
Continue Practice Exam Test Questions Part 2 of the Series
Choose the letter of the best answer in each questions.
51. Multimeter typically provides measurements of __________ values (for a sinusoidal waveform).
A. peak
B. rms
C. average
D. instantaneous
Answer: Option B
Solution:
52. Dynamometer type instrument can be used for
A. ac work only
B. dc work only
C. both dc and ac work
D. neither dc nor ac works
Answer: Option C
Solution:
53. What instrument which springs provide the controlling torque as well as serve to lead current into and out of the operating coil?
A. Moving-iron
B. Permanent-magnet
C. Hot-wire
D. Iron-wire
Answer: Option B
Solution:
54. In VTVMs, _________ refers to the smallest signal that can be reliably measured.
A. threshold signal
B. minimum signal
C. sensitivity
D. input signal
Answer: Option C
Solution:
55. The frequency of rotation in some rotating machinery can be measured by a
A. VTVM
B. Tachometer
C. Spectral meter
D. Stroboscope
Answer: Option D
Solution:
56. Which of the items below describes an absorption meter’s usage?
A. Check the output frequency of a transmitter
B. Monitors the output current of a receiver
C. Monitors the frequency ratio of a device
D. Frequency generator
Answer: Option A
Solution:
57. What instrument is used for observing voltage and current waveforms?
A. Multimeter
B. DMM
C. Oscilloscope
D. Telescope
Answer: Option C
Solution:
58. Which of the following forces does not act on the moving systems of analog instruments?
A. A deflecting force
B. A controlling force
C. A damping force
D. An electrostatic force
Answer: Option D
Solution:
59. When current through the operating coil of a moving-iron instrument is tripled the operating force becomes
A. six times
B. one-half time
C. nine times
D. three times
Answer: Option C
Solution:
60. What is the typical full-scale deflection current of a moving coil instrument?
A. 50 mA
B. 50 nA
C. 50 µA
D. 50 A
Answer: Option A
Solution:
61. What instrument is used for measuring the amount of current flowing in a circuit?
A. Voltmeter
B. Ammeter
C. Oscilloscope
D. Meter amperage
Answer: Option B
Solution:
62. What type of meter gives a precise reading on voltage, current or resistance where there is the generation of samples at the input and then feeds it to a digital read-out?
A. VOM
B. VTVM
C. DMM
D. DTMF
Answer: Option C
Solution:
63. What is the typical full-scale voltage across a moving coil voltmeter?
A. 50 nV
B. 50 µV
C. 50 V
D. 50 mV
Answer: Option D
Solution:
64. What is the period of a repetitive signal?
A. One-fourth cycle of the waveform
B. Two cycles of the waveform
C. One cycle of the waveform
D. One-half cycle of the waveform
Answer: Option C
Solution:
65. What element of a CRT releases electrons when heated indirectly by a filament?
A. Cathode
B. Grid
C. Anode
D. Phosphor screen
Answer: Option A
Solution:
66. Moving-iron instrument has what scale?
A. Uniform
B. Logarithmic
C. Squared
D. Exponential
Answer: Option C
Solution:
67. A pattern displayed by oscilloscopes which has a steady characteristic is called
A. Lissajous pattern
B. Nyquist pattern
C. Barkhausen’s criterian
D. Fermat’s pattern
Answer: Option A
Solution:
68. A galvanometer with a 20 Ω coil resistance has a full-scale deflection of 10mA. A 0.02 Ω is placed across the meter to increase its rating capacity. What is the new full-scale current foe the meter?
A. 1.01 A
B. 100.1 A
C. 10.10 A
D. 10.01 A
Answer: Option D
Solution:
69. Which of the following extends the range of a moving-iron ac ammeter?
A. A shunt
B. A multiplier
C. Changing number of turns of operating coil
D. A series
Answer: Option C
Solution:
70. Which part of the following is not a basic part of a CRT?
A. Electron gun
B. Focusing and accelerating elements
C. Horizontal and vertical deflecting plates
D. Sawtooth generator
Answer: Option D
Solution:
71. For amplitude measurements, what scale is calibrated in either volts per centimeter (V/cm), or milivolts per centimeter (mV/cm).
A. Horizontal
B. Diagonal
C. Vertical
D. Voltage
Answer: Option C
Solution:
72. What ammeter is used to measure high-frequency currents?
A. Hot-wire
B. Moving-iron
C. Dynamometer
D. Thermocouple
Answer: Option D
Solution:
73. Which of the voltmeter is used for measuring high direct voltage (say 10kV)?
A. Permanent-magnet moving coil
B. Hot-wire
C. Electrostatic
D. Moving iron
Answer: Option C
Solution:
74. A common technique for measuring power at high frequency is to
A. employ high power meter
B. use microwave meters
C. employ a sensing element that converts the RF power to a measurable dc or low-frequency signal
D. use thermocouple
Answer: Option C
Solution:
75. What provides visual display showing the form of the signal applied as a waveform on the front screen of a cathode ray oscilloscope?
A. Television
B. Computer
C. Meter face
D. CRT
Answer: Option D
Solution:
76. Electrostatic instruments are exclusively used as
A. voltmeters
B. ohmmeters
C. ammeters
D. wattmeters
Answer: Option A
Solution:
77. What is the typical power range of thermocouple sensors
A. 0.1 mW to 100 W
B. 0.1 µW to 100 mW
C. 0.1 nW to 100 µW
D. 0.1 pW to 100 nW
Answer: Option B
Solution:
78. An electric pyrometer is an instrument used to measure
A. phase
B. high temperatures
C. frequency
D. power
Answer: Option B
Solution:
79. Which instrument is the most sensitive?
A. Moving-iron
B. Dynamometer
C. Hot-wire
D. Permanent-magnet moving coil
Answer: Option D
Solution:
80. Which is the most commonly used induction type instrument?
A. Induction voltmeter
B. Induction watt-hour meter
C. Induction wattmeter
D. Induction ammeter
Answer: Option B
Solution:
81. What type of instrument is the watt-hour meter?
A. An integrating
B. A recording
C. An indicating
D. A power meter
Answer: Option A
Solution:
82. A certain pulse measures 10ms and has a period of 50ms. The duty cycle is
A. 20%
B. 10%
C. 5%
D. 100%
Answer: Option A
Solution:
83. Indicating instrument is assumed to be most accurate at what part of the scale?
A. At beginning
B. At half of full
C. At ending
D. Any part
Answer: Option B
Solution:
84. On a simple ohmmeter, the 0 Ω mark is located __________ of the scale.
A. at far left
B. at far right
C. at ending
D. any part
Answer: Option B
Solution:
85. One of the basic functions of electronic circuit is
A. the generation and manipulation of electronic waveshapes
B. the creation of a signal
C. the transmission of electrical signal
D. the reception of electric signal
Answer: Option A
Solution:
86. What provides a visual presentation of ant waveform applied to the input terminals?
A. Cathode ray oscilloscope (CRO)
B. Cathode ray tube (CRT)
C. Spectrum analyzer
D. VTVMs
Answer: Option A
Solution:
87. The interval of a pulse from start to end is the _________ of the pulse
A. period
B. width
C. position
D. duty cycle
Answer: Option A
Solution:
88. Considered as the “heart” of the cathode ray oscilloscope.
A. Cathode ray tube (CRT)
B. Sawtooth generator
C. Horizontal amplifier
D. Vertical amplifier
Answer: Option A
Solution:
89. A material that glows when struck by the energetic electrons in a CRT.
A. Aquadag
B. Silicon
C. Germanium
D. Phosphor
Answer: Option D
Solution:
90. What sensor provides a change of resistance with typical power range of 1µW to 10mW and with maximum frequency greater than 100GHz?
A. Thermal converter
B. Diode sensor
C. Thermocouple sensor
D. Thermistor sensor
Answer: Option D
Solution:
91. An ammeter with an internal resistance of 50 Ω is used to measure a current through a load resistance RL= 1 k Ω. Determine the percentage error of the reading due to ammeter insertion.
A. 67.4%
B. 6.74%
C. 4.76%
D. 47.6%
Answer: Option C
Solution:
92. Most AC voltmeters have an rms scale which is valid only if the input signal being measured is a ________ signal.
A. square wave
B. triangular
C. sawtooth
D. sinusoidal
Answer: Option D
Solution:
93. Which of the following bridges measures dc resistance?
A. Wheatstone
B. Maxwell bridge
C. Hay bridge
D. Schering bridge
Answer: Option A
Solution:
94. What bridge is used to measure high-Q inductors (Q>10)?
A. Wheatstone bridge
B. Wien bridge
C. Hay bridge
D. Maxwell bridge
Answer: Option C
Solution:
95. Maxwell bridge measures an unknown inductance in terms of known
A. resistance
B. frequency
C. inductance
D. capacitance
Answer: Option D
Solution:
96. What is used for measuring medium Q coils (1<Q<10)?
A. Maxwell bridge
B. Wheatstone bridge
C. Kelvin bridge
D. Hay bridge
Answer: Option A
Solution:
97. What has a series RC combination in one arm and a parallel RC combination in the adjoining arm and used as a notch filter in harmonic distortion analyzer?
A. Wien bridge
B. Maxwell bridge
C. Kelvin bridge
D. Hay bridge
Answer: Option A
Solution:
98. Sensitivity of a voltmeter is expressed in
A. Ω/V
B. Ω/A
C. V/Ω
D. V/A
Answer: Option A
Solution:
99. What is the smallest change in applied stimulus that will indicate a detectable change in deflection in a indicating instrument called?
A. Sensitivity
B. Accuracy
C. Resolution
D. Precision
Answer: Option C
Solution:
100. Insulation resistance is measured by which meter?
A. Ohmmeter
B. Insulation meter
C. Wien bridge
D. Megger
Answer: Option D
Solution:
Questions and Answers in Tests and Measurements
Following is the list of multiple choice questions in this brand new series:
Complete List of MCQs in Electronics Engineering per topic
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Sir,in Q-55 i don't know whether Stroboscope is used to speed or not,but Tachometer is surely used.So in this question 1st preference is given to Tachometer instead of Stroboscope.m i right,sir?
Sir,in 69.we generally prefer shunt resistor,to extend the range of ammeter instead of changing number of turns of operating coil.so i think preferable ans in 69 is shunt instead of changing coil turn.