Test yourself Flashcards
Convert 220C to fahrenheit
428 F
Convert 400F to celcius
204C
What is the area of a circle that is 55 m in diameter
2375.8 meters squared
What is the volume in cubic meters of a cylindrical tank with flat ends that is 1.5 meters in diameter and 3.2 meters in length
5.654 meter cubed
What is the volume in litres of a rectangle tank that is 1.3 meter by 1.8 meter and is 5.2 meters long
12,168 litres
A triangle is 90 right triangle. The two sides adjoining the right angle are 33 cm and 44 cm. What is the length of the third side?
55 cm
What is the area of a right angle triangle with sides 5,7 and 8.602m
17.5 meter squared
What is the unit of all forms of energy?
Joule
A pressure gauge reads 100 kPa. What is the absolute pressure (total)?
201.3 KPa
How many kj/kg of energy must be removed to freeze liquid water at 0C into ice at 0C?
335 kj/kg
What is the weight of 1 litre of pure water?
1kg
What is temp of of absolute zero on Celsius scale
-273 C
What is a BTU
Heat energy required to raise 1lb of water 1F
What is the specific heat of water in kj/kg K
4.18 kj//kg K
What would 1 tonne of water weigh in kg
1000 kg
A 120 v circuit draws 16 amps what is the power consumption in watts
1920 w (1.92 kw)
What current will flow through a 25 w bulb at 12 v
2.08 amps
What is the power in watts of a 11 amp supply to a 3 ohm resistance
363w
How much would it cost to use 5 kw for 5 hours at 5.08 cents per kw hour
$2.00
An arena has 120 lights which are 300 watts each. If electricity costs 5.08/kw hour, what is the cost to run the lights per hour.
$2.88 per hour
What is the cost per day to run the lights
$69.12 per day
What is another term used when referring to watts
Power
What is the resistance of an electric heater that draws 14 amps at 240 volts
17.14 ohms
In a series circuit of 3 equal resistances, supplied by a 9 volt battery that uses a flow of .03 amps, what is the ohm of each resistance
100 ohms
What class of fire extinguisher would you require for an electrical fire
Class C
What class of fire extinguisher would you require for a wood fire
Class A
What class of fire extinguisher would you require for a plastics fire
Class B
What class of fire extinguisher would you require for a burning metal fire
Class D
What type of refrigerant can you detect with dye and ultraviolet lights
Freon
What is the most important thing to do in the event of a fire
Sound the alarm
Where is the emergency stop and ammonia release valve for a refrigerant plant
Outside the building
What colour is the fire box painted
Red
What is the minimum interval that refrigerant detectors must be calibrated
Annually
What is the most common cause of accidents
Human error
What does WHMIS stand for
Workplace hazardous material information system
What does SDS stand for
Safety data sheet
Do ammonia cylinders stored in your refrigerant plant require labels
Yes
When must the WHMIS program be reviewed
Annually
Who administers WHMIS legislation
Worksafe BC
Who is responsible for providing labels on controlled products
The supplier
Who is responsible for training workers to understand SDS sheets
The employer
Who is responsible to make sure products are identified
The employer
How many WHMIS hazard classes are there
10
Is it Federal or Provincial Government that legislates WHMIS
Both; Federal (supply), Provincial (use)
Do SDS’s expire? If so, when?
No but they must be current
Can you use a controlled product if it does not have a SDS?
No
In the event of eye contact with ammonia what should you do
Flush eyes with large quantities of water
What should you do after severe inhalation of ammonia fumes
Obtain immediate medical attention. Follow SDS section Inhalation
Is ammonia combustible
Yes but with difficulty
What are the flammability limits of ammonia
16% - 25%
What is the ph of a 10% solution of ammonia
12
Is ammonia alkaline or acidic
Alkaline
What is the boiling point of liquid ammonia at atmospheric pressure
-33.35C
If a 15ft cubed pressure vessel has a pressure relief valve set at 1725 kPa, then the pressure relief valves must not let the pressure in the vessel rise more than ___ above the setting of the pressure release valve
A - 90%. B - 172.5 kPa.
C - 10 psi. D- 0 kPa
E - 1725 kPa
B 10% higher than 1725 kPa setting.
In order to substitute a refrigerant with a different kind of refrigerant, which of the following is true?
A- compliance with the latest edition CSA B52
B- permission of the manufacturer
C- permission of the contractor
D- compliance with the original code of construction
A
What is the minimum design pressure for an R717 air cooled compression refrigeration system
A- 2016 kPa
B- 138 kPa
C- 293 kPa
D- 951 kPa
E- none of these
A
What is the required relief valve capacity for an evaporator which is 2.5 m in diameter and 4m overall length (assume NH3 is refrigerant)
A- 5 kg per minute
B- 24 lbs air per minute
C- 5 lbs air per minute
D- 25 kg air per minute
D
If the location of refrigerant piping is installed between floors that are not adjacent, which is true
A- the piping shall be contained in an approved rigid, fire resisting pipe
B- the piping shall be non-ferrous larger than 28.6 mm
C- that piping must be located in an air shaft
D- that piping must cross a stairway or lobbies
E- none of these
A
Carbon dioxide CO2 is
A- a group A1 refrigerant
B- not grouped
C- not a refrigerant
D- toxic when contained
E- banned for use
A
A change of state with no change in temperature is caused by ____
Latent heat, sensible heat, conduction, or convection
Latent heat
A flourocarbon or halocarbon is ____.
a secondary coolant, a Freon, a halogen, or none of these
A Freon
Is ammonia refrigerant cheaper or more expensive than R22?
Cheaper
Does heat travel FROM the brine or TO the brine in the ice rink floor?
To the brine
Is R-290 (propane)more or less flammable than R-22?
More flammable
Is refrigerant R-717 more or less toxic than R134a?
More
The boiling point of water at atmospheric pressure is _____
100C
The boiling point of ammonia at atmospheric pressure is _____.
-33C
The separation between the primary and secondary refrigerants is ____.
the chiller, the compressor, the evaporator, the TXV
The chiller
The brine usually used for ice rink cooling floors is ____.
Sodium, calcium chloride, glycol
Calcium chloride
The brine should be kept at about pH ____.
7.5 to 8.5
The main problem with steel brine piping is ____.
Rust on outside, corrosion and fouled nipples
What liquid flows through the headers in an indirect system?
Secondary coolant (calcium chloride, glycol)
Waste heat produced by the refrigeration system can be used for ____
Heating floor, Zamboni, snow melt
The freeze point of calcium chloride is usually kept between ___C and ___C
-20 -23
The two types of arena floors are the cooling floor and the ________
Heating floor
