CHST Exam Study Guide: Questions With Complete
Solutions
Is a trench considered an excavation? Right Ans - Yes
What is the distance a worker needs to maintain from power lines? Right
Ans - 10ft
What does the severity of electric shock depend on? Right Ans - Path of
current, amount of current, duration of exposure
True or false: electrical current as low as 75 milliamps can cause death?
Right Ans - True
What are some examples of surcharge loads? Right Ans - Spoils pile and
equip being too close to walls
What is the correct extension cord for construction? Right Ans - 3 wire
type designed for hard or extra hard use
True or false: Exposed metal parts of equipment should be grounded Right
Ans - True
How does a gfci protect against electrical shock? Right Ans - Detects the
difference in current between the black and white wires
How can overloaded circuit hazards be controlled? Right Ans - Through the
use of electrical protective devices
What are some examples of electrical protective devices? Right Ans - Gfcis,
fuses, circuit breakers
What is static electricity? Right Ans - An electric charge that cannot move
How wide must the platform of a scaffold be? Right Ans - 18 inches
The platform of a scaffold must be capable of supporting its weight and
__________ times the maximum load. Right Ans - Four
, The ropes or wires used in suspension scaffolds must be capable of
supporting ______ times the load. Right Ans - Six
What should be used to restrain supported scaffold platforms from tipping?
Right Ans - Guys, ties, or braces
What is Fall Prevention? Right Ans - The process, equipment, and methods
used to actually prevent a fall from occurring.
What is fall protection? Right Ans - The process, equipment, and methods
used to protect a worker once a fall has occurred.
The top edge height of a guardrail should be _________ in. above the
walking/working surface. Right Ans - 42 +/- 3
What are some common hazards associated with hot work? Right Ans - -
Health hazards (air contaminants from welding operations [iron oxide, zinc,
beryllium, copper], burns, burns to the eyes from flashes)
-Physical hazards (tripping from hoses)
-fires and explosions (igniting gases, improper storage)
What are some controls for the hazards created when performing hot work?
Right Ans - Protect or remove fire hazards in the area, confine heat, sparks,
and slag, fire extinguishing equipment available, ventilation
What are some common electrical hazards? Right Ans - Exposed electrical
parts, overhead power lines, inadequate wiring, defective or damaged cords
and wires, improper use of flexible cords, improper grounding, overloaded
circuits
What are some controls utilized for electrical hazards? Right Ans -
Training, planning, gfci's, fuses, circuit breakers, lockout tagout
What are some common hazards associated with excavations? Right Ans -
Weight (nearby vehicles/equipment), vibration, underground utilities, water
and soil erosion.
Solutions
Is a trench considered an excavation? Right Ans - Yes
What is the distance a worker needs to maintain from power lines? Right
Ans - 10ft
What does the severity of electric shock depend on? Right Ans - Path of
current, amount of current, duration of exposure
True or false: electrical current as low as 75 milliamps can cause death?
Right Ans - True
What are some examples of surcharge loads? Right Ans - Spoils pile and
equip being too close to walls
What is the correct extension cord for construction? Right Ans - 3 wire
type designed for hard or extra hard use
True or false: Exposed metal parts of equipment should be grounded Right
Ans - True
How does a gfci protect against electrical shock? Right Ans - Detects the
difference in current between the black and white wires
How can overloaded circuit hazards be controlled? Right Ans - Through the
use of electrical protective devices
What are some examples of electrical protective devices? Right Ans - Gfcis,
fuses, circuit breakers
What is static electricity? Right Ans - An electric charge that cannot move
How wide must the platform of a scaffold be? Right Ans - 18 inches
The platform of a scaffold must be capable of supporting its weight and
__________ times the maximum load. Right Ans - Four
, The ropes or wires used in suspension scaffolds must be capable of
supporting ______ times the load. Right Ans - Six
What should be used to restrain supported scaffold platforms from tipping?
Right Ans - Guys, ties, or braces
What is Fall Prevention? Right Ans - The process, equipment, and methods
used to actually prevent a fall from occurring.
What is fall protection? Right Ans - The process, equipment, and methods
used to protect a worker once a fall has occurred.
The top edge height of a guardrail should be _________ in. above the
walking/working surface. Right Ans - 42 +/- 3
What are some common hazards associated with hot work? Right Ans - -
Health hazards (air contaminants from welding operations [iron oxide, zinc,
beryllium, copper], burns, burns to the eyes from flashes)
-Physical hazards (tripping from hoses)
-fires and explosions (igniting gases, improper storage)
What are some controls for the hazards created when performing hot work?
Right Ans - Protect or remove fire hazards in the area, confine heat, sparks,
and slag, fire extinguishing equipment available, ventilation
What are some common electrical hazards? Right Ans - Exposed electrical
parts, overhead power lines, inadequate wiring, defective or damaged cords
and wires, improper use of flexible cords, improper grounding, overloaded
circuits
What are some controls utilized for electrical hazards? Right Ans -
Training, planning, gfci's, fuses, circuit breakers, lockout tagout
What are some common hazards associated with excavations? Right Ans -
Weight (nearby vehicles/equipment), vibration, underground utilities, water
and soil erosion.
