Safety Trained Supervisor Personal Protective Equipment 2 — Questions and Answers
Question 1: Which hard hat class provides protection against high-voltage electrical hazards up to 20,000 volts?
- Class A
- Class B (Correct answer)
- Class C
- Class E
Correct answer: Class B
Class B hard hats are designed for high-voltage electrical work and provide protection against electrical hazards up to 20,000 volts as well as impact.
Question 2: An employee is working with chemicals that may splash. Which eye protection provides the BEST defense?
- Safety glasses with side shields
- Welding goggles
- Chemical splash goggles with a sealed fit (Correct answer)
- A face shield worn alone
Correct answer: Chemical splash goggles with a sealed fit
Chemical splash goggles create a sealed barrier around the eyes from all directions, preventing liquid chemicals from entering from any angle.
Question 3: What is the minimum NIOSH filter rating required for respiratory protection against airborne tuberculosis?
- N95 (Correct answer)
- N99
- P100
- N100
Correct answer: N95
N95 respirators, which filter at least 95% of airborne particles, are the minimum protection recommended by CDC and OSHA for tuberculosis exposure.
Question 4: Which type of glove provides the BEST protection against electrical shock when performing work on energized circuits?
- Leather work gloves
- Latex disposable gloves
- Rubber insulating gloves with voltage rating (Correct answer)
- Cut-resistant fiber gloves
Correct answer: Rubber insulating gloves with voltage rating
Rubber insulating gloves are specifically designed and voltage-rated for electrical work, providing the dielectric protection needed against electrical shock.
Question 5: Safety footwear with an ANSI/ASTM impact and compression rating primarily protects against which hazard?
- Chemical splashes to the foot
- Falling and rolling objects causing crush injuries (Correct answer)
- Electrical contact through the sole
- Slips on wet or oily surfaces
Correct answer: Falling and rolling objects causing crush injuries
ANSI/ASTM-rated safety toe caps (steel or composite) protect the foot from falling objects and compressive forces from rolling or crushing hazards.
Question 6: When is a full-body harness required rather than a body belt for personal fall arrest?
- When working at heights greater than 4 feet
- Body belts are prohibited for fall arrest; harnesses are always required (Correct answer)
- Only when working on suspended scaffolding
- Only when working on fixed ladders above 24 feet
Correct answer: Body belts are prohibited for fall arrest; harnesses are always required
OSHA prohibits body belts for fall arrest because they can cause serious internal injuries during arrest; full-body harnesses must always be used for fall arrest applications.
Question 7: A worker is exposed to 92 dBA noise for an 8-hour shift. Using the OSHA derating method [(NRR-7)/2], approximately what NRR is needed to reach safe exposure levels?
- NRR 10
- NRR 17
- NRR 25 (Correct answer)
- NRR 33
Correct answer: NRR 25
To reduce 92 dBA to OSHA's 90 dBA PEL requires ~2 dB attenuation; the OSHA method gives effective protection of (NRR-7)/2, so an NRR 25 provides approximately 9 dB — safely covering the needed reduction.
Safety Trained Supervisor Personal Protective Equipment 2
Which hard hat class provides protection against high-voltage electrical hazards up to 20,000 volts?