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Worksheets20-50
Total questions: 31
Worksheet time: 16mins
70. What is the purpose of using conduit in cable routing? PHOTO
A. To provide a decorative element to the wiring system
B. To increase the electrical conductivity of the cables
C. To support electrical cables and protect them from harsh conditions
D. To make the cables easier to cut
71. What is the advantage of using plastic conduit over metal conduit?
A. Plastic conduit provides better electrical grounding
B. Plastic conduit is more durable than metal conduit
C. Plastic conduit is cheaper than metal conduit
D. Plastic conduit is superior with regard to chemical corrosion resistance
72. What is the purpose of using flexible liquid-tight conduit when connecting electrical conduit to end-point devices? PHOTO
A. It makes the conduit easier to cut
B. It makes the conduit look more attractive
C. It provides stress relief to the conduit
D. It increases the electrical conductivity of the conduit
73. What is a busway used for in industrial facilities? PHOTO
A. For providing a pathway for workers to walk through the facility
B. For electrical power distribution
C. For instrumentation, control, or signaling purposes
D. For supporting the weight of the building
74. What is the purpose of wire duct and wire loom in an electrical enclosure? PHOTO
A. To neatly route power, signal, and instrumentation conductors
B. To increase the electrical conductivity of the wires
C. To provide a decorative element to the enclosure
C. To provide a decorative element to the enclosure
75. What is an optical fiber?
A. A type of electrical cable
B. A type of LED
C. A pipe through which light flows
D. A type of photodiode
76. What is the predominant use of optical fiber in modern industry?
A. As a data communication
B. As a replacement for LED lights
C. As a source of light for homes
D. As a replacement for photodiodes
77. What is one advantage of optical fiber over electrical cable?
A. It needs to avoid tight bend radii
B. It requires expensive testing equipment
C. It requires specialized tools for installation
D. It has a much greater bandwidth
78. What is the primary function of the core in an optical fiber? PHOTO
A. To protect the fiber from abrasion
B. To provide coloring for fiber identification
C. To serve as a waveguide for light
D. To channel electrical energy
79. Why is the cladding layer necessary in an optical fiber? PHOTO
A. To absorb specific light wavelengths
B. To provide additional protection against abrasion
C. To prevent leakage of optical power
D. To enhance the tensile strength of the cable
80. What is the purpose of the plastic jacket around the cladding in an optical fiber? PHOTO
A. To prevent leakage of optical power
B. To absorb specific light wavelengths
C. To provide protection against abrasion
D. To increase the diameter of the fiber
81. What is the primary difference between multi-mode fibers and single-mode fibers? PHOTO
A. Multi-mode fibers are more suitable for high-speed data transmission.
B. Single-mode fibers support multiple independent pathways within the core.
C. Multi-mode fibers have a larger core diameter than single-mode fibers.
D. Single-mode fibers exhibit less modal dispersion.
82. What is the typical range of core diameters for single-mode optical fibers? PHOTO
A. 8 microns
B. 20 microns
C. 4 to 10 microns
D. 50 microns or more
83. What is the purpose of maintaining a minimum bend radius for optical fibers? PHOTO
A. To increase the speed of data transmission
B. To prevent light leakage from the cladding
C. To improve signal strength
D. To reduce cable weight
84. What safety concern arises when working with optical fibers during installation or maintenance?
A. Exposure to toxic chemicals
B. all answers right
C. Danger from glass fiber fragments
D. Risk of electrical shock
85. What is the purpose of testing optical fibers?
A. To measure certain performance characteristics
B. All answers correct
C. To ensure all installed cable lengths and connectors are functioning properly
D. To quantify any degradation of cables or connectors over time
86. Which type of optical fiber test measures the power level of light at the far end of the fiber from a known source? PHOTO
A. Sophisticated light analysis.
B. Time domain reflectometry.
C. Echo signal analysis.
D. Optical power loss testing
87. What does an Optical Time-Domain Reflectometer (OTDR) do? PHOTO
A. Analyzes light over brief periods.
B. Measures optical power.
C. Tests connectors on the spool prior to installation.
D. Probes characteristics of long optical fibers.
88. Which type of diagram is used to represent the “big picture” of a process, focusing on the process itself rather than individual instruments?
A. Functional diagrams
B. Process Flow Diagrams (PFDs)
C. Loop diagrams
D. Process and Instrument diagrams (P&IDs)
89. What type of diagram is used to document the strategy of a control system, placing emphasis on the algorithms used to control a process?
A. Process Flow Diagrams (PFDs)
B. Process and Instrument diagrams (P&IDs)
C. Functional diagrams
D. Loop diagrams
90. Which type of diagram lies somewhere in the middle between process flow diagrams and loop diagrams, showing the layout of all relevant process vessels, pipes, and machinery, with instruments superimposed on the diagram?
A. Functional diagrams
B. Process Flow Diagrams (PFDs)
C. Process and Instrument diagrams (P&IDs)
D. Loop diagrams
91. What is the primary purpose of a Process Flow Diagram (PFD) in a compressor control system? PHOTO
A. To show the interconnections of individual instruments
B. To document the strategy of a control system
C. To show the layout of all process vessels, pipes, and machinery with instruments superimposed on the diagram
D. To show the general flow of the process itself and only a bare minimum of control instrumentation
92. In the given compressor control system, what might the level transmitter (LT) on the bottom of the knockout drum control? PHOTO
A. The pressure inside the compressor
B. The temperature of the evaporator
C. The level valve (LV) on the bottom of the same vessel
D. The flow of the compressor
93. What does the Process Flow Diagram (PFD) show relating directly to the compressor in the given system? PHOTO
A. The temperature transmitter (TT) on the top of the evaporator
B. The level transmitter (LT) on the bottom of the knockout drum
C. The flow transmitter (FT) on the suction line
D. The control system of the compressor
94. What does a Process and Instrument Diagram (P&ID) provide a “zoomed in” view of in a compressor control system? PHOTO
A. The compressor as a unit
B. The whole evaporator process
C. The control system
D. The individual instruments
95. In the given compressor control system, what does a common “loop number” indicate? PHOTO
A. The instruments are part of different control systems
B. The instruments are of the same type
C. The instruments are physically connected
D. The instruments are part of the same control system
96. What does the type of “bubble” used for each instrument in a P&ID indicate? PHOTO
A. The function of the instrument
B. The loop number of the instrument
C. The type of the instrument
D. The location of the instrument
97. What does a rectangular box enclosing both temperature recorders in a P&ID indicate? PHOTO
A. The temperature recorders are part of different physical instruments
B. The temperature recorders are malfunctioning
C. The temperature recorders are of different types
D. The temperature recorders are part of the same physical instrument
98. What is the most detailed form of diagram for a control system as a whole?
A. Functional diagram
B. Process and Instrument Diagram (P&ID)
C. Process Flow Diagram (PFD)
D. Loop diagram
99. What does an “up” arrow (↑) next to an instrument bubble in a loop diagram represent? PHOTO
A. A reverse-acting instrument: one whose output signal decreases as the input stimulus increases
B. A direct-acting instrument: one whose output signal increases as the input stimulus increases
C. An instrument that is not part of the control system
D. An instrument that is malfunctioning
100. What is the primary focus of a functional diagram in a control system? PHOTO
A. The process piping or instrument interconnections
B. The flow of information within the control system
C. The actual equipment layout
D. The final control element
