ITI Electrician Safety MCQ – Electrician Safety Objective Question & Answer

Placing a pillow under the head of an unconscious person is not recommended for several critical reasons:

• General First Aid Guidelines: First aid protocols consistently advise against placing any padding under the head of an unconscious individual. This practice is discouraged across various medical guidelines to ensure the safety and well-being of the patient.
• Risk of Aspiration: Placing a pillow under the head of an unconscious person can cause them to aspirate (inhale) fluids or vomit into their lungs. This can lead to serious complications and even death.
• Maintaining Airway: In an unconscious person, the tongue can fall back and block the airway. Placing a pillow under the head can worsen this situation. Instead, the first aider should ensure the person is lying on their side in the recovery position to keep the airway open.

The correct order for the operation of a fire extinguisher is Pull, Aim, Squeeze, Sweep.

This sequence is summarized by the acronym PASS, which stands for:

1. Pull: Pull the pin to break the tamper seal and prepare the extinguisher for use.
2. Aim: Aim the nozzle at the base of the fire, as this is where the fuel source is located.
3. Squeeze: Squeeze the handle to release the extinguishing agent.
4. Sweep: Sweep the nozzle from side to side while keeping it aimed at the base of the fire until it is completely extinguished

In first aid, CPR stands for Cardio-Pulmonary Resuscitation.

• Lifesaving technique: CPR is crucial in situations where immediate intervention is necessary to prevent death.
• Emergencies: CPR is specifically used when someone’s heart has stopped (cardiac arrest) or they’ve stopped breathing.
• Chest compressions: These are rhythmic pushes on the chest, which help circulate blood.
• Rescue breaths: These provide oxygen to the lungs. (Current guidelines emphasize chest compressions, but rescue breaths are still important, especially for certain situations like drowning.)
• Maintain blood flow and oxygenation: The primary goal of CPR is to keep blood circulating and delivering oxygen to vital organs, particularly the brain, until advanced medical care is available.
• Until professional medical help arrives: CPR is a temporary measure to buy time until paramedics or other medical professionals can take over.

It’s important to remember that CPR is most effective when performed immediately. Training in CPR is highly recommended for everyone, as it can make a life-or-death difference.

Headshields with earmuffs are protective devices designed to provide safety and comfort in various environments, particularly in industrial and noisy settings. They combine head and face protection with hearing protection.

Components

Headshield: A headshield is a protective covering that shields the face and neck from hazards. Different types exist, including:

• Face Shields: Protection from splashes and debris.
• Welding Helmets: Eye and face protection from intense light and sparks.
• Grinding Shields: Protection from flying particles.

Earmuffs: Earmuffs are padded coverings that fit over the ears, connected by a headband or designed for cap mounting. They provide hearing protection.

Functions and Benefits

Noise Reduction: Earmuffs provide effective attenuation of sound, with Noise Reduction Ratings (NRR) typically ranging from 20-30 decibels, helping to protect against noise-induced hearing loss. They are particularly useful in environments where noise levels exceed safe limits.

• Comfort and Fit: Properly fitted earmuffs ensure a good seal around the ears, which is essential for effective noise reduction. Adjustable headbands allow for a customized fit, accommodating different head sizes.
• Dual Protection: In very loud environments, using earmuffs in conjunction with earplugs can provide dual protection, significantly reducing the risk of hearing damage.

Versatility: Headshields with earmuffs are used across various industries:

• Construction: Demolition, operating heavy machinery.
• Manufacturing: Metalworking, woodworking, assembly lines.
• Other Industries: Airport ground crews, motorsports, shooting ranges, forestry.

The most suitable fire extinguisher for extinguishing a fire caused by cotton or other cloth is Water.

• Class A Fires: Fires involving ordinary combustibles such as wood, paper, and textiles (including cotton) fall under Class A. Water is an effective extinguishing agent for these types of fires as it cools the burning material and prevents re-ignition.
• Water: Water is one of the most common and effective fire extinguishers, especially for fires involving ordinary combustibles like wood, paper, and cloth. Water cools the fire and extinguishes it by removing heat from the burning material. It’s also inexpensive and readily available.

Why the other options are less suitable:

• Dry chemicals: Dry chemical fire extinguishers are effective on various types of fires (Class A, B, and C), but water is a more effective and cheaper option for cloth fires. Dry chemicals can also leave a residue that can be difficult to clean up in some situations.

• Foam: Foam fire extinguishers are primarily used for fires involving flammable liquids (like oil and gasoline). They are not as effective on cloth fires as water.

• Soda acid: Soda acid fire extinguishers are no longer in common use and have been replaced by more modern extinguishers. They are not as effective as water for cloth fires.

The below warning sign indicates risk of laser beam.

Laser Beam Warning Signs: Ensuring Safety

Laser beam warning signs are essential safety measures in any environment where lasers are used. Their primary purpose is to prevent accidental exposure to laser radiation, which can cause serious injuries, particularly to the eyes and skin.

Importance:

• Hazard Awareness: These signs alert personnel to the presence of potential laser hazards, allowing them to take appropriate precautions.
• Injury Prevention: By clearly marking laser-controlled areas, these signs significantly reduce the risk of accidental exposure and subsequent injuries.
• Regulatory Compliance: Posting appropriate laser warning signs is often mandated by safety regulations and standards (e.g., ANSI Z136, IEC 60825).

Placement:

Warning signs must be prominently displayed:

• Entry Points: At all entrances to laser-controlled areas.
• Within Laser-Controlled Areas: In locations where laser beams are present or where exposure is possible.
• Equipment: On or near laser equipment itself.

Types of Laser Warning Signs:

Laser warning signs are categorized based on the potential hazard level, often corresponding to the laser’s classification:

• Notice Signs: Provide general information about laser use in the area.
• Caution Signs: Indicate a potential hazard with lower-power lasers (e.g., Class 2, Class 3R). These signs typically advise caution and avoiding staring directly into the beam.
• Warning Signs: Used for moderate-risk lasers (e.g., Class 3B). These signs indicate a significant hazard and warn against direct beam viewing and skin exposure.
• Danger Signs: Reserved for the highest-risk lasers (e.g., Class 4). These signs indicate an immediate and severe hazard, warning against any direct or diffuse beam viewing, skin exposure, and potential fire hazards.

The suitable extinguisher for extinguishing a live electrical fire is CO2 fire extinguisher

• Effectiveness on Electrical Fires: CO2 fire extinguishers are specifically designed for use on electrical fires because they do not conduct electricity, making them safe to use on live electrical equipment. They work by displacing oxygen around the fire, effectively smothering it and preventing re-ignition.
• Advantages of CO2 Extinguishers:
  • No Residue: CO2 leaves no residue, which means it won’t damage sensitive electronic equipment or create a mess after use.
  • Cooling Effect: While they do not cool the fire as effectively as water, they do help to lower the temperature of the burning material by removing heat from the combustion triangle

The shape and color of a mandatory sign is Circular shape – white symbol on blue background

Mandatory signs, also known as compulsory signs, indicate actions that must be taken. Their shape and color are standardized for easy recognition and universal understanding.

Shape:

Mandatory signs are always circular. This distinct shape helps them to be quickly identified and differentiated from other types of safety signs (e.g., prohibition signs are circular with a red diagonal line, warning signs are triangular).

Color:

The background of a mandatory sign is blue, and the symbol or pictogram illustrating the required action is white. This color combination is specifically chosen for its high contrast and visibility.

Purpose:

The purpose of mandatory signs is to clearly and unambiguously instruct people to perform a specific action. Examples include:

• Wearing personal protective equipment (PPE) such as safety helmets, safety glasses, ear protection, or safety footwear.
• Keeping walkways clear.
• Using pedestrian crossings.

Examples of Mandatory Signs:

• A blue circle with a white hard hat symbol means “Safety helmet must be worn.”
• A blue circle with white safety glasses means “Eye protection must be worn.”
• A blue circle with white ear muffs means “Ear protection must be worn.”

The image shows a yellow triangle with a black border and a black exclamation point in the center. This is a standard warning sign.

Characteristics of the Warning Sign

1. Shape:
   • The triangular shape is universally recognized as a warning indicator. Triangles are often used in safety signage to alert individuals to potential hazards.
2. Color:
   • Yellow Background: The bright yellow color is highly visible and is used to attract attention, signaling caution.
   • Black Border and Symbol: The black border enhances visibility and contrast, while the black exclamation point signifies a general warning.
3. Symbolism:
   • The exclamation point in the center of the triangle indicates that there is a cautionary message that requires attention. It warns individuals to be alert for potential dangers or hazards in the area.

Purpose of Warning Signs

• Alertness: The primary purpose of warning signs is to alert people to potential dangers or unsafe conditions that may require caution or special attention.
• Safety Precautions: These signs are commonly found in various environments, including construction sites, industrial areas, roadways, and public spaces, where hazards may be present.

If a person affected by electrical shock becomes unconscious and stops breathing but their heart is still functioning, the most urgent and immediate cure is Artificial respirators.

• Artificial Respiration: Since the person has stopped breathing, it is critical to provide artificial respiration immediately to ensure that oxygen continues to reach the brain and vital organs. This can be done through mouth-to-mouth resuscitation or using a bag-valve-mask device if available.
• Importance of CPR: If the person is unconscious and not breathing, starting CPR (Cardiopulmonary Resuscitation) is essential. CPR combines chest compressions with artificial ventilation to maintain blood circulation and oxygenation until professional medical help arrives.