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WorksheetsSchematic Diagrams – Relay School
Total questions: 58
Worksheet time: 29mins
What is a one line diagram an overview of?
The substation
The control circuits
The panel wiring
The drawing revisions
The AC Schematic shows in more detail all three phases and neutral connections of AC voltage and current circuits.
True
False
Fill in the blank: The DC Schematic shows in more detail the control circuits including _______, closing, and alarms.
tripping
switching
monitoring
signaling
What does the panel wiring diagram identify?
The substation overview
The actual wiring on a panel
The control circuits
The drawing revisions
Utilities may have different methods to identify areas of the drawings that have been revised including _______.
circling, cross hatching, etc.
highlighting, underlining, etc.
color coding, numbering, etc.
doodling, sketching, etc.
A phasor is a representation of a complex number used in electrical engineering to represent sinusoidal functions.
A type of resistor
A representation of a complex number used in electrical engineering
A unit of frequency
A type of capacitor
The purpose of using phasor diagrams is to:
visualize complex numbers in electrical engineering
measure the speed of light
calculate gravitational force
determine chemical reactions
What is the frequency of the United States power system?
50 Hz
60 Hz
70 Hz
80 Hz
Refer to the typical balanced 3 phase current waveform and equivalent phasor diagram shown in fig. 2. What is the phase relationship between the currents using the phasor diagram?
The currents are in phase
The currents are 120 degrees apart
The currents are 90 degrees apart
The currents are 180 degrees apart
In a CT circuit, how can the residual current be found using phasors?
By measuring the phase difference between current and voltage
By summing the phasors of all currents
By calculating the vector sum of all phase currents
By using the RMS value of the current
What does the symbol 'T' stand for in schematic diagrams?
Transformer
Transistor
Trip coil
Timer
Fill in the blank: The symbol 'Th' represents a _______ in schematic diagrams.
Transformer (high voltage side)
Transistor
Thermistor
Thyristor
What is the meaning of the symbol 'TM' in schematic diagrams?
A) Timer
B) Telemetering
C) Trip coil
D) Transistor
Fill in the blank: The symbol 'U' stands for _______ in schematic diagrams.
Unit
Universal
Uranium
Utility
What does the symbol 'BK' denote in the main device parts?
A) Brake
B) Breaker
C) Battery
D) Base
Fill in the blank: The symbol 'C' represents a _______ in the main device parts.
Coil or capacitor
Resistor
Inductor
Transistor
What is the meaning of the symbol 'HC' in the main device parts?
A) Heat coil
B) Holding coil
C) High current
D) Hydraulic control
The symbol 'SI' stands for _______ in the main device parts.
Seal-in
System Integration
Signal Input
Standard Interface
What does the symbol 'TC' denote in the main device parts?
A) Trip coil
B) Timer coil
C) Transformer coil
D) Transistor coil
Fill in the blank: The symbol 'V' represents a _______ in the main device parts.
Valve
Voltage
Vector
Volume
What does the letter 'A' stand for in the schematic diagrams?
A) Accelerating or automatic
B) Blocking or back-up
C) Close or cold
D) Drop out
What does the letter 'B' stand for in the schematic diagrams?
A) Blocking or back-up
B) Decelerating, down or disengaged
C) Emergency or engaged
D) Failure or forward
What does the letter 'C' stand for in the schematic diagrams?
Close or cold
Hot or high
Left, local, low, lower or leading
Manual
What does the letter 'D' stand for in the schematic diagrams?
Decelerating, down or disengaged
Emergency or engaged
Failure or forward
High speed
What does the letter 'E' stand for in the schematic diagrams?
Emergency or engaged
Failure or forward
Hand reset
Instantaneous
What does the letter 'F' stand for in the schematic diagrams?
A) Failure or forward
B) High speed
C) Left, local, low, lower or leading
D) Manual
What does the letter 'H' stand for in the schematic diagrams?
A) Hot or high
B) Instantaneous
C) Manual
D) Off
What does the letter 'HS' stand for in the schematic diagrams?
High speed
Left, local, low, lower or leading
Manual
Off
What does the letter 'I' stand for in the schematic diagrams?
A) Instantaneous
B) Manual
C) Off
D) On
What does the letter 'L' stand for in the schematic diagrams?
A) Left, local, low, lower or leading
B) Manual
C) Off
D) On
What does the letter 'M' stand for in the schematic diagrams?
A) Manual
B) Off
C) On
D) Polarizing
What does the letter 'OFF' stand for in the schematic diagrams?
A) Off
B) On
C) Polarizing
D) Pick up
What does the letter 'ON' stand for in the schematic diagrams?
A) On
B) Polarizing
C) Pick up
D) Right, raise, reclosing, receiving, remote or reverse.
What does the letter 'P' stand for in the schematic diagrams?
A) Polarizing
B) Pick up
C) Right, raise, reclosing, receiving, remote or reverse
D) Sending or Swing
What does the letter 'PU' stand for in the schematic diagrams?
A) Pick up
B) Right, raise, reclosing, receiving, remote or reverse
C) Sending or Swing
D) Test, trip, trailing or time.
What does the letter 'R' stand for in the schematic diagrams?
A) Right, raise, reclosing, receiving, remote or reverse
B) Sending or Swing
C) Test, trip, trailing or time
D) Test switch.
What does the letter 'S' stand for in the schematic diagrams?
A) Sending or Swing
B) Test, trip, trailing or time
C) Test switch
D) Time delay
What does the letter 'T' stand for in the schematic diagrams?
A) Test, trip, trailing or time
B) Test switch
C) Time delay
D) Time delay closing (TDPU)
What does the letter 'TS' stand for in the schematic diagrams?
A) Test switch
B) Time delay
C) Time delay closing (TDPU)
D) Time delay opening (TDDO)
What does the letter 'TD' stand for in the schematic diagrams?
A) Time delay
B) Time delay closing (TDPU)
C) Time delay opening (TDDO)
D) Zone
What does the letter 'TDC' stand for in the schematic diagrams?
A) Time delay closing (TDPU)
B) Time delay opening (TDDO)
C) Zone
D) Accelerating or automatic.
What does the letter 'TDO' stand for in the schematic diagrams?
A) Time delay opening (TDDO)
B) Zone
C) Accelerating or automatic
D) Blocking or back-up
What does the letter 'U' stand for in the schematic diagrams?
Up
Zone
Accelerating or automatic
Blocking or back-up
What does the letter 'Z' stand for in the schematic diagrams?
Zone
Accelerating or automatic
Blocking or back-up
Close or cold
What are the phase identification letters for the North American convention?
A) A, B, C
B) R, S, T
C) 1, 2, 3
What are the phase identification letters for the Older European convention?
A) R, S, T
B) A, B, C
C) 1, 2, 3
What are the phase identification numbers for the Present European convention?
A) 1, 2, 3
B) A, B, C
C) R, S, T
What is the output of the 'AND' function when both inputs are 1?
a) 0
b) 1
What is the output of the 'OR' function when both inputs are 0?
0
1
What is the output of the 'NAND' function when both inputs are 1?
0
1
What is the output of the 'NOR' function when both inputs are 0?
0
1
What is the output of the 'Exclusive OR' function when both inputs are 1?
0
1
What is the output of the 'INVERT' or 'NOT' function when the input is 0?
0
1
The purpose of the M.R.C.T. 600/5 in the schematic diagram is:
To provide power supply
To measure current
To control voltage
To act as a fuse
Identify the component labeled 'TS' in the schematic diagram and explain its function.
Transistor - It amplifies current.
Transformer - It transfers electrical energy between circuits.
Thermistor - It changes resistance with temperature.
Thyristor - It acts as a switch.
In the schematic diagram, what does the symbol 'TRIPS S101, S102, S106' indicate?
It indicates a power failure.
It indicates a circuit breaker trip.
It indicates a system overload.
It indicates a maintenance alert.
Which component in the schematic diagram is responsible for the alternate source?
Transformer
Generator
Inverter
Battery
The role of the 'BANK #1' in the schematic diagram is to:
store electrical energy
convert AC to DC
amplify signals
regulate voltage
