Multiple Choice Questions Topic Outline
- MCQs in Volt, Ohm, Ammeter (analog/digital)
- MCQs in R-L-Z bridges
- MCQs in Oscilloscope
- MCQs in Cable Testers
- MCQs in RF Meters
- MCQs in Signal Generators (audio, RF, video)
- MCQs in Noise Generators
- MCQs in Power
- MCQs in Reflectometer
- MCQs in Grid dip meter
The Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part 2 of the Series
51. Multimeter typically provides measurements of __________ values (for a sinusoidal waveform).
- A. peak
- B. rms
- C. average
- D. instantaneous
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
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
54. In VTVMs, _________ refers to the smallest signal that can be reliably measured.
- A. threshold signal
- B. minimum signal
- C. sensitivity
- D. input signal
55. The frequency of rotation in some rotating machinery can be measured by a
- A. VTVM
- B. Tachometer
- C. Spectral meter
- D. Stroboscope
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
57. What instrument is used for observing voltage and current waveforms?
- A. Multimeter
- B. DMM
- C. Oscilloscope
- D. Telescope
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
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
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
61. What instrument is used for measuring the amount of current flowing in a circuit?
- A. Voltmeter
- B. Ammeter
- C. Oscilloscope
- D. Meter amperage
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
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
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
65. What element of a CRT releases electrons when heated indirectly by a filament?
- A. Cathode
- B. Grid
- C. Anode
- D. Phosphor screen
66. Moving-iron instrument has what scale?
- A. Uniform
- B. Logarithmic
- C. Squared
- D. Exponential
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
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
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
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
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
72. What ammeter is used to measure high-frequency currents?
- A. Hot-wire
- B. Moving-iron
- C. Dynamometer
- D. Thermocouple
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
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
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
76. Electrostatic instruments are exclusively used as
- A. voltmeters
- B. ohmmeters
- C. ammeters
- D. wattmeters
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
78. An electric pyrometer is an instrument used to measure
- A. phase
- B. high temperatures
- C. frequency
- D. power
79. Which instrument is the most sensitive?
- A. Moving-iron
- B. Dynamometer
- C. Hot-wire
- D. Permanent-magnet moving coil
80. Which is the most commonly used induction type instrument?
- A. Induction voltmeter
- B. Induction watt-hour meter
- C. Induction wattmeter
- D. Induction ammeter
81. What type of instrument is the watt-hour meter?
- A. An integrating
- B. A recording
- C. An indicating
- D. A power meter
82. A certain pulse measures 10ms and has a period of 50ms. The duty cycle is
- A. 20%
- B. 10%
- C. 5%
- D. 100%
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
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
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
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
87. The interval of a pulse from start to end is the _____ of the pulse
- A. period
- B. width
- C. position
- D. duty cycle
88. Considered as the “heart” of the cathode ray oscilloscope.
- A. Cathode ray tube (CRT)
- B. Sawtooth generator
- C. Horizontal amplifier
- D. Vertical amplifier
89. A material that glows when struck by the energetic electrons in a CRT.
- A. Aquadag
- B. Silicon
- C. Germanium
- D. Phosphor
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
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%
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
93. Which of the following bridges measures dc resistance?
- A. Wheatstone
- B. Maxwell bridge
- C. Hay bridge
- D. Schering bridge
94. What bridge is used to measure high-Q inductors (Q>10)?
- A. Wheatstone bridge
- B. Wien bridge
- C. Hay bridge
- D. Maxwell bridge
95. Maxwell bridge measures an unknown inductance in terms of known
- A. resistance
- B. frequency
- C. inductance
- D. capacitance
96. What is used for measuring medium Q coils (1<Q<10)?
- A. Maxwell bridge
- B. Wheatstone bridge
- C. Kelvin bridge
- D. Hay bridge
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
98. Sensitivity of a voltmeter is expressed in
- A. Ω/ V
- B. Ω/A
- C. V/ Ω
- D. V/A
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
100. Insulation resistance is measured by which meter?
- A. Ohmmeter
- B. Insulation meter
- C. Wien bridge
- D. Megger
Post a Comment
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.