Human Factors & Ergonomics Exam Questions and Answers Solved Correctly Rated A+
What is the basis, according to the National Electrical Code (NEC), for the minimum lighting load? -
Answers VA per area of occupied space
According to the National Electrical Code (NEC), lighting systems operating at this voltage are allowed to
have exposed bare conductors, as long as such conductors are installed at least 2.1 m (7 ft) above the
finished floor. - Answers 30 V
In terms of EMC, a signal in the range of 1 GHz is considered to be in the ————— emissions range. -
Answers radiated
What is the term for the corrective steps taken to return a polluted site to its original condition? -
Answers remediation
Which of the following fault types is the most severe? - Answers three-phase symmetrical fault
Air will turn "stale" after the carbon dioxide concentration has built up to about what percentage by
volume? - Answers 0.5%
According to Occupational Safety and Health Administration (OSHA) permissible noise exposure levels,
what is most nearly the time a worker is permitted to be exposed to a sound pressure level of 120 dB? -
Answers 0.13 h
For a DC rotating machine, what term describes the ratio of the safe load to the nameplate load? -
Answers service factor
What information is NOT present in an MSDS? - Answers possible reaction mechanisms
In a properly designed and coordinated electrical protection system, the device ————— from/to the
fault will trip —————. - Answers nearest; last
What is the advantage of fluidized-bed combustors when compared to other combustion methods? -
Answers All of the above are true.
Which of the following represents a type of grounding model for lightning protection? - Answers (A) and
(B)
Using which of these evaluation steps will NOT reduce or eliminate the hazards from vapors and gases
produced by hazardous solvents? - Answers benzene or carbon tetrachloride if it is not possible to use
water.
Which of the following types of mechanical seals can be used when a pumped product has a relatively
high specific gravity (greater than 0.4) and low fugitive emissions are allowed?
, single seals
tandem seals
double seals - Answers II and III only
Which of the following are the end products of the bioremediation of organic compounds? - Answers
water and carbon dioxide only
Why are secondary combustor chambers necessary in most kiln incinerators? - Answers Toxins in the
gases are destroyed in the second chamber.
The quality of surge arrestors is measured using the - Answers PQI
What is the term for the injection of air into groundwater to push contaminants into overlying soil? -
Answers sparging
What is the primary gas produced by decaying matter in a landfill? - Answers methane
According to OSHA, most nearly what is theMINIMUM concentration of oxygen by volume that
ventilation should ensure in a breathable space? - Answers 19.5%
What do stripping towers normally remove from water? - Answers volatile organic compounds
Which of the following factors is the main cause of carbon monoxide in the exhaust products of
combustion processes with air? - Answers insufficient air
Which of the following is NOT a significant problem encountered in hazardous waste incinerators? -
Answers large temperature fluctuations
Which of the following is NOT an advantage of using electrostatic precipitators over other methods of
particulate removal? - Answers particle size insensitivity
A person is shocked by grasping a current-carrying wire and current begins flowing through the person's
body. Most nearly, what is the lowest current at which the person may not be able to let go of the wire?
- Answers 6 mA
Which of the following is removed from a gas stream when a spray tower is used as a wet scrubber? -
Answers particulates
Which does NOT reduce worker noise exposure? - Answers performing audiometric tests
What electric shock current level will most likely result in death? - Answers 100 mA
What is the primary cause of acid rain? - Answers sulfur oxides
The mixed dose exceeds the OSHA standard when it equals or exceeds - Answers 100%
What is the basis, according to the National Electrical Code (NEC), for the minimum lighting load? -
Answers VA per area of occupied space
According to the National Electrical Code (NEC), lighting systems operating at this voltage are allowed to
have exposed bare conductors, as long as such conductors are installed at least 2.1 m (7 ft) above the
finished floor. - Answers 30 V
In terms of EMC, a signal in the range of 1 GHz is considered to be in the ————— emissions range. -
Answers radiated
What is the term for the corrective steps taken to return a polluted site to its original condition? -
Answers remediation
Which of the following fault types is the most severe? - Answers three-phase symmetrical fault
Air will turn "stale" after the carbon dioxide concentration has built up to about what percentage by
volume? - Answers 0.5%
According to Occupational Safety and Health Administration (OSHA) permissible noise exposure levels,
what is most nearly the time a worker is permitted to be exposed to a sound pressure level of 120 dB? -
Answers 0.13 h
For a DC rotating machine, what term describes the ratio of the safe load to the nameplate load? -
Answers service factor
What information is NOT present in an MSDS? - Answers possible reaction mechanisms
In a properly designed and coordinated electrical protection system, the device ————— from/to the
fault will trip —————. - Answers nearest; last
What is the advantage of fluidized-bed combustors when compared to other combustion methods? -
Answers All of the above are true.
Which of the following represents a type of grounding model for lightning protection? - Answers (A) and
(B)
Using which of these evaluation steps will NOT reduce or eliminate the hazards from vapors and gases
produced by hazardous solvents? - Answers benzene or carbon tetrachloride if it is not possible to use
water.
Which of the following types of mechanical seals can be used when a pumped product has a relatively
high specific gravity (greater than 0.4) and low fugitive emissions are allowed?
, single seals
tandem seals
double seals - Answers II and III only
Which of the following are the end products of the bioremediation of organic compounds? - Answers
water and carbon dioxide only
Why are secondary combustor chambers necessary in most kiln incinerators? - Answers Toxins in the
gases are destroyed in the second chamber.
The quality of surge arrestors is measured using the - Answers PQI
What is the term for the injection of air into groundwater to push contaminants into overlying soil? -
Answers sparging
What is the primary gas produced by decaying matter in a landfill? - Answers methane
According to OSHA, most nearly what is theMINIMUM concentration of oxygen by volume that
ventilation should ensure in a breathable space? - Answers 19.5%
What do stripping towers normally remove from water? - Answers volatile organic compounds
Which of the following factors is the main cause of carbon monoxide in the exhaust products of
combustion processes with air? - Answers insufficient air
Which of the following is NOT a significant problem encountered in hazardous waste incinerators? -
Answers large temperature fluctuations
Which of the following is NOT an advantage of using electrostatic precipitators over other methods of
particulate removal? - Answers particle size insensitivity
A person is shocked by grasping a current-carrying wire and current begins flowing through the person's
body. Most nearly, what is the lowest current at which the person may not be able to let go of the wire?
- Answers 6 mA
Which of the following is removed from a gas stream when a spray tower is used as a wet scrubber? -
Answers particulates
Which does NOT reduce worker noise exposure? - Answers performing audiometric tests
What electric shock current level will most likely result in death? - Answers 100 mA
What is the primary cause of acid rain? - Answers sulfur oxides
The mixed dose exceeds the OSHA standard when it equals or exceeds - Answers 100%
