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OHST SELF ASSESSMENT EXAM 2
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OHST SELF ASSESSMENT EXAM 2
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OHST SELF ASSESSMENT EXAM 2IF a vessel contains 80% air and 20% hydrocarbons, what is he oxygen content of the
vessel?
a. 14%
b. 21%
c. 16.8%
d. 15.5%
The correct answer is C
Normal air contains 21% oxygen by volume. The question states the vessel only
contains 80% normal air, therefore
0.21 x 0.80 = 0.168 = 16.8%
The tool rest on a grinding wheel should be ______ away from the wheel.
a. 1/4 inch
b. 1/2 inch
c. 1/3 inch
d. 1 inch
The correct answer is A
Of the choices offered, always keep the tool rest 1/4 inch from the working edge of the
wheel is the best answer. However, you will find 1/8 inch as the required distance in
most safety literature. As a test strategy, I would answer 1/8 of an inch if that is an
option, however, if 1/4 is the lowest number, then select it.
,An elevator daily spot check should include which of the following?
a. V-Groove
b. Governor
c. Cable gripper jaws
d. Brakes
The correct answer is D
According to the NSC Accident Prevention Manual (Administration and Programs) daily
spot checks of elevators should be conducted at the beginning of each day and include:
level floor stops, testing of the alarm bell, brakes and other mechanical operations.
Selection A "V-Groove refers to older friction equipment in which the hoisting rope is not
attached ot the machine. The elevator ismoved by the traction of the ropes in v-grooves
on the drive pulley. The V-groove would require monthly inspection. Selection B
"Governor" refers to a speed control device that is normally checked monthly. Selection
C "cable gripper jaws" refers to cable grabbing devices that hold governors, counter
weights or the car itself, which are inspected annually.
Which of the following measurements does not the inverse square law not apply to?
a. Heat
b. Illumination
c. Noise
d. Radiation
The correct answer is C
You can use the inverse square law for measurements concerning noise, illumination
and radiation, but not heat.
,Damage to the eyes of an unprotected observer from the flash of an electric welder's
arc could be caused by the exposure to:
a. Infrared light
b. Invisible radiation
c. Ultraviolet radiation
d. Sensible light
The correct answer is C.
Damage to the eyes from ultraviolet radiation is much more violent than those of the
visible or infrared, a sever burn can be produced with little or not warning an significant
damage to the lens of the eye can occur.
When conducting a fire investigation, the number one area to be determine is?
a. Fire ignition sequence
b. Response time
c. Number of deaths
d. Were all building and fire codes followed in construction
The correct answer is A
To determine the root cause, you need to determine the fire ignition source and the area
of origin.
Carbon tetrachloride is most likely to cause damage to the ______________.
a. Heart
, b. Lungs
c. Liver
d. Bones
The correct answer is C
Carbon tetrachloride (Carbon Tet) is an outlawed solvent that causes damage to the
liver.
In the design of a ventilation system which of the following operations would require the
greatest capture velocity?
a. Evaporation from open surface tanks
b. Spray booths
c. Welding
d. Grinding
The correct answer is D.
Grinding operations create large amounts of contaminants at very high initial velocities,
thus demanding higher capture velocities to secure the contaminates. All of the other
operations listed generate contaminates with low velocities.
What is the desired air velocity (fpm) at relief or spot cooling stations for activity that
produces extremely high heat loads for workers?
a. 50 fpm
b. 100 fpm
c. 125 fpm
d. 4000 fpm
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