29 Questions
What is the primary function of a control system?
To provide protection for the operator and persons in the vicinity
What is the main difference between a single-phase and a three-phase system?
The amount of power required
What is the purpose of fuses and circuit breakers?
To protect the circuit from overloads
What is the name of the type of electrical circuit that requires only two lines?
Single-phase system
What is the function of overload relays?
To protect the motor
What are mechanical and electrical safeguards used for?
To protect the operator and persons in the vicinity
What type of diagram is used to show the physical layout of components and their wire connections?
Wiring diagram
What is the purpose of the M contacts in the holding circuit?
To keep the circuit energized when the start pushbutton is released
What is shown in Figure 1, but not in the ladder diagram?
The physical location of the M contacts
What is the purpose of the start-stop pushbutton station?
To start and stop the motor
What is the term used to describe the circuit formed by the M contacts and the start pushbutton?
Holding circuit
What type of installation is a wiring diagram commonly used in?
Motor control installations
What is the primary focus of schematic diagrams?
Electrical sequence of components
What state are schematics drawn to show components in?
De-energized or off state
What happens to a normally open contact when its controlling coil energizes?
It closes
What happens to the contacts controlled by a coil when it is de-energized?
They return to their normal state
What determines which contacts are controlled by a coil?
Label or number of the coil and contact
What is the consequence of the float switch closing?
The buzzer and warning light are connected in parallel
What type of diagram is commonly used in educational materials?
Pictorial diagram
What is the purpose of pictorial diagrams in motor control circuits?
To provide a detailed view of circuit components
What style of diagram is the top part of the diagram in Figure below?
Connection diagram
What is the purpose of ladder diagrams in motor control circuits?
To show the sequence of circuit operations
What is the document number of the learning module ESW2 ELECTRICAL WORSHOP 2?
REF-OAP-INT-SSD
What is the primary purpose of three-phase systems in industries?
To provide a large amount of power
How many current-carrying conductors are used in a three-phase system?
Three
What is the phase shift in the voltage and current waveforms between the three conductors?
120°
What is the characteristic of a balanced three-phase load?
Its current values cancel each other out
How are unbalanced three-phase loads mainly connected?
In Wye configuration
What is always true about a motor in a three-phase circuit?
It is always balanced
Learn about the importance of circuit protection and the role of fuses, circuit breakers, and overload relays in protecting motors and circuits. This module covers the basics of electrical workshop safety and best practices.
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