Multiple Choice Questions Topic Outline
- MCQs in Industrial Electronics
- MCQs in Electronic Control System
- MCQs in Industrial Solid State Services
- MCQs in Welding Systems
- MCQs in Thyristors
- MCQs in High Frequency Heating
- MCQs in Feedback Systems / Servomechanism
- MCQs in Transducers
- MCQs in Motor Speed Control Systems
- MCQs in Robotic Principles
- MCQs in Bioelectrical Principles
- MCQs in Instrumentation and Control
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. What is dimensionless parameter of the second-order characteristic equation?
- A. Damping ratio
- B. Accuracy
- C. Efficiency ratio
- D. Transfer function ratio
52. What is the ratio of two exponential functions of time called?
- A. Transfer function
- B. Damping ratio
- C. Efficiency
- D. Gain
53. A diac is turned on by
- A. breakover voltage
- B. gate current
- C. gate voltage
- D. anode current
54. An SCR whose state is controlled by the light falling upon a silicon semiconductor layer of the device.
- A. SCS
- B. GTO
- C. Thyristor
- D. LASCR
55. A diac is simply
- A. a single junction
- B. a three junction device
- C. a triac without a gate terminal
- D. the SCR
56. What region lies between the peak point and valley point of UJT emitter characteristic?
- A. Saturation
- B. Cut off
- C. Negative resistance
- D. Positive resistance
57. What refers to the application of electronic theory, technology, instrumentation, and computing system to biological research and medical problems?
- A. Medical electronics
- B. Genetics electronics
- C. Biomedical engineering
- D. Biomedical electronics
58. Which device exhibits negative resistance region?
- A. Diac
- B. Triac
- C. Transistor
- D. UJT
59. The UJT operates in what region after peak point?
- A. Cut off
- B. Negative resistance
- C. Saturation
- D. Positive resistance
60. SCR is a rectifier constructed of silicon material. Silicon is chosen because
- A. it is the most abundant material
- B. of its strength and ruggedness
- C. it is much cheaper than any other material
- D. of its high temperature and power capabilities
61. A transduction principle used primarily in optical sensors.
- A. Photoconductive transduction
- B. Photovoltaic transduction
- C. Electromagnetic transduction
- D. Piezoelectric transduction
62. What is a solid state equivalent of a gas filled triode?
- A. Triac
- B. Thyristor
- C. SCR
- D. SCS
63. The supply voltage is generally _____ that of breakover voltage in an SCR.
- A. equal to
- B. less than
- C. greater than
- D. twice
64. The triac is fundamentally a/an _____ with a gate terminal for controlling the turn-on conditions of the bilateral device in either direction.
- A. SCR
- B. Quadric
- C. Shockley diode
- D. Diac
65. When the supply voltage exceeds the breakover voltage of an SCR, it
- A. starts conducting
- B. stops conducting
- C. conducts leakage current
- D. conducts terminal current
66. The step response of a first order systems is given by
- A. y(t) = A0
- B. y(t) = A0 + A1es1t + A2es2t +A3es3t
- C. y(t) = A0 + A1es1t + A2es2t
- D. y(t) = A0 + A1es1t
67. A feedback control system in which the controlled variable is mechanical position.
- A. Closed-loop feedback control system
- B. Open-loop feedback control system
- C. Servomechanism
- D. Mechanical servomechanism
68. What is that voltage above when the SCR enters the conduction region?
- A. Reverse breakover voltage
- B. Forward breakover voltage
- C. Holding voltage
- D. Trigger voltage
69. A locus or path of the roots traced out on the s-plane as a parameter is changed.
- A. Root locus
- B. Hyperbola
- C. Parabola
- D. Circle
70. A control system in which the output is related to the input by device parameters only.
- A. Open-loop control system
- B. Closed-loop control system
- C. Servomechanism
- D. Feedback control system
71. What is that value of current below which the SCR switches from the conduction state to the forward blocking region under stated conditions?
- A. Holding current
- B. Forward current
- C. Reverse current
- D. Trigger current
72. Which is equivalent to a zener or avalanche region of the fundamental two-layer semiconductor diode?
- A. Reverse breakdown voltage
- B. Forward breakdown voltage
- C. Breakdown voltage
- D. Breakover voltage
73. What is the required gate triggering current of GTO?
- A. 20 mA
- B. 10 mA
- C. 30 mA
- D. 40 mA
74. What is an automatic speed control device using the centrifugal force on rotating flyweights as the feedback element?
- A. Regulator
- B. Flywheel governor
- C. Field control
- D. Throttle valve
75. What is the sensing element of acceleration transducer?
- A. Damper
- B. Spring
- C. Seismic mass
- D. Crystal
76. What are some areas where GTO is applicable?
- A. Counters
- B. Pulse generators
- C. Multivibrators
- D. All of the above
77. What Greek word which means “switch”?
- A. Ristor
- B. Trans
- C. Thy
- D. Thyristor
78. What is the typical turn-on time of an SCR?
- A. 1 μs
- B. 5 μs
- C. 10 μs
- D. 3 μs
79. An SCR is a solid state equivalent of which tube?
- A. Triode
- B. Gas-filled triode
- C. Pentode
- D. Tetrode
80. The gate of an SCR is _____ with respect to its cathode.
- A. positive
- B. at zero potential
- C. negative
- D. at infinite potential
81. A normally operated SCR has an anode which is _____ with respect to cathode.
- A. negative
- B. positive
- C. at zero potential
- D. at infinite potential
82. What device measures humidity directly with a single sensing element?
- A. Hygrometer
- B. Tachometer
- C. Venturi meter
- D. Hydrometer
83. What is one of the most widely used sensing elements particularly for pressure ranges higher than 2 MPa?
- A. Bellows
- B. Bourdon tube
- C. Capsule
- D. Straight tube
84. Which of the following can change the angle of conduction in SCR?
- A. Changing anode voltage
- B. Changing gate voltage
- C. Reverse biasing the gate
- D. Changing cathode voltage
85. An SCR is a member of what family?
- A. Thyrector
- B. Thyratron
- C. Thyristor
- D. Transistor
86. How many pn junction does SCRs have?
- A. Two
- B. Four
- C. Three
- D. Five
87. Which of the following is NOT a method primarily used for density sensing?
- A. Sonic
- B. Radiations
- C. Vibrating element
- D. Differential
88. When SCR starts conducting, then _____ losses all control.
- A. gate
- B. anode
- C. cathode
- D. anode supply
89. An SCR when turned on has a typical voltage across of
- A. zero
- B. 0.1 V
- C. infinite
- D. 1 V
90. The typical turn-off time of an SCR is about
- A. 20 to 40 μs
- B. 5 to 40 μs
- C. 1 to 5 μs
- D. 15 to 25 μs
91. An SCR is made of what material?
- A. Silicon
- B. Carbon
- C. Germanium
- D. Gallium-arsenide
92. ECG stands for electrocardiography while EEG stands for?
- A. electroextracellugraphy
- B. electroemyography
- C. electroencephalography
- D. electrovectorcardiography
93. Acceleration transducers are also called
- A. gyros
- B. force transducers
- C. tachometers
- D. accelerometers
94. When an SCR is combined to a switch, it is considered as a _____ switch.
- A. bidirectional
- B. mechanical
- C. unidirectional
- D. omnidirectional
95. When the firing angle of SCR is increased, its output
- A. decreases
- B. increases
- C. remains unchanged
- D. doubles
96. When the SCR is OFF, the current in the circuit is
- A. exactly zero
- B. large leakage current
- C. small leakage current
- D. thermal current
97. The SCR can exercise control over _____ of ac supply.
- A. positive or negative half-cycle
- B. both positive and negative half-cycles
- C. only positive half-cycle
- D. only negative half-cycle
98. What is the most widely used altitude and altitude-rate transducers?
- A. Flowmeter
- B. Psychometer
- C. Gyro
- D. Gygrometer
99. What sensing element is typically made from a thin-walled tube formed into deep convolutions and sealed at one end, whose displacement can then be made to act on a transduction element?
- A. Diaphragm
- B. Bellow
- C. Capsule
- D. Bourdon tube
100. The voltage across an SCR when it is turned on is about
- A.0.5 V
- B. 0.1 V
- C. 1 V
- D. 5 V
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