Questions and Answers
Which type of diagram is most useful for tracing a fault on a starting air compressor?
What is the primary function of electrical schematics?
Which type of diagram shows the simplified inter-relationships of elements in a system?
Which diagram illustrates all essential parts and connections of a circuit using graphical symbols?
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What type of diagram focuses on showing system bounds without indicating cause-and-effect relationships?
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What does an equipment wiring diagram specifically show?
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What is the purpose of a circuit diagram?
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What type of diagram depicts control systems and complex relationships?
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Which option is not considered an electrical hazard?
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What is the purpose of connecting a conductor between the metal body of an electric motor and the ground?
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Which function of a multi-tester is used to measure the continuity of a cable?
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How should a multi-tester be connected to measure the current of an indicator lamp?
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Which instrument is primarily used to check the winding resistance of a 3-phase motor?
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Which instrument can be used to measure the current of a 2 Hp single-phase motor?
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What is designed to protect specific areas of the body, including head, face, and hands?
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Which action poses a risk to life when working with electrical equipment?
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Study Notes
Electrical Hazards and Safety
- Earthing is a protective measure, not an electrical hazard.
- Explosion, electric burns, and electric shocks are classified as electrical hazards.
Protection Mechanisms
- A conductor connecting the metal body of an electric motor to the ground protects personnel.
- Proper grounding prevents electrical shock and equipment damage.
Multi-tester Functions
- The ohm (Ω) function of a multi-tester measures continuity in cables.
- To measure current in an indicator lamp, connect the multi-tester in series with the lamp.
Measurement Instruments
- An ohm meter is specifically used to check the winding resistance of a three-phase motor.
- A clamp meter can measure current in a 2 Hp single-phase motor effectively.
Personal Protective Equipment (PPE)
- PPE is designed to protect various body parts including head, face, eyes, body, hands, and feet.
- Proper PPE reduces risk during electrical work.
Safety Practices
- Leaving live conductors or rotating parts exposed poses a significant risk to life.
- Operating equipment as per manufacturer's recommendations enhances safety.
Multi-tester Handling
- Setting a multi-tester to current mode and placing it across a load can damage the multi-tester.
- It's crucial to measure current accurately without placing it across a load.
Resistance Measurement
- Resistance measurements require the power supply to be off and capacitors discharged to ensure safety and accuracy.
Electrical Diagrams
- Wiring diagrams are most useful for tracing faults in a starting air compressor.
- A well-documented schematic visualizes the electric circuit layout and functionality.
Diagram Types and Functions
- Block diagrams simplify the relationships among system elements and operations.
- Circuit diagrams represent the complete workings of a circuit with essential parts and connections.
- Wiring diagrams detail connections between components, often with approximate physical positions shown.
Operation Understanding
- A circuit diagram helps readers comprehend operational sequences from initiation to final actions within the electrical system.
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Description
This quiz covers essential concepts related to electrical hazards, safety practices, and the protection mechanisms in electrical work. Understand the importance of personal protective equipment (PPE) and the correct usage of multi-testers and measurement instruments. Test your knowledge on preventing electrical hazards and ensuring safety while working with electrical systems.
