The standard refrigeration cycle is used to compare refrigerants and machines operating under comparable conditions. These standard conditions are:

The standard refrigeration cycle is used to compare refrigerants and machines operating under comparable conditions. These standard conditions are: a)...

The refrigerating effect of a refrigerant is

The refrigerating effect of a refrigerant is a) equal to its latent heat of vaporization b) greater than its latent heat of vaporization c) less...

The property which has to be known for the calculation of the size of control valve and piping etc, is

The property which has to be known for the calculation of the size of control valve and piping etc, is a) specific volume b) enthalpy c) refrigerating...

Which of the following is a thermodynamic property of heat?

Which of the following is a thermodynamic property of heat? a) entropy b) enthalpy c) density d) volume e) all of the above Answer: ...

The refrigerant R-11 belongs to the following group

The refrigerant R-11 belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "2B" e) group "A1" Answer: ...

Ammonia refrigerants

Ammonia refrigerants a) have high sensible heat capacity b) mix well with oil c) are very expensive d) are well suited for industrial refrigeration e)...

The ideal commercial refrigerant should

The ideal commercial refrigerant should a) have a low latent heat capacity b) have a high boiling point c) have high condensing pressure d) be environmentally...

What is the name of the refrigerant that has the following characteristics? It is nonflammable, odourless, nontoxic, it does not have a corrosive effect on metal if water is present and at atmospheric pressure it has a boiling point of -40.6 degrees C.

What is the name of the refrigerant that has the following characteristics? It is nonflammable, odourless, nontoxic, it does not have a corrosive effect...

R-22 (Freon-22) is nontoxic and nonflammable. Which group does it belong to?

R-22 (Freon-22) is nontoxic and nonflammable. Which group does it belong to? a) Group A2 b) Group B4 c) Group A1 d) Group A3 e) Group B2 Answ...

Which of the following characteristics is common in all of the group B refrigerants?

Which of the following characteristics is common in all of the group B refrigerants? a) High toxicity b) High flammability c) Average Flammability d)...

Which column in the refrigerant table lists the absolute pressure in kPa?

Which column in the refrigerant table lists the absolute pressure in kPa? a) Column 1 b) Column 2 c) Column 3 d) Column 4 e) None of the above ...

If a cooled medium had an evaporation temperature of 2 degrees C, the evaporation temperature of the liquid refrigerant should be approximately

If a cooled medium had an evaporation temperature of 2 degrees C, the evaporation temperature of the liquid refrigerant should be approximately a)...

One tonne of refrigeration is

One tonne of refrigeration is a) 13958 kJ per day b) 100 kJ per minute c) 233 kJ per minute d) 13958 J per hour e) 335 J per second Answer:...

Refrigerant mediums will evaporate

Refrigerant mediums will evaporate a) when pressure is increased b) when temperature is increased c) when they are diluted d) when temperature is...

The rate at which a system will remove heat from the refrigerated medium is defined as

The rate at which a system will remove heat from the refrigerated medium is defined as a) coefficient of performance b) net refrigerating effect c)...

Which of the following statements about high-side pressure and temperature is true?

Which of the following statements about high-side pressure and temperature is true? a) The heat flow is from the cooling medium to the hot refrigerant. b)...

Which of the following statements about low-side pressure and temperature is false?

Which of the following statements about low-side pressure and temperature is false? a) The evaporation temperature of the refrigerant should be 5...

The function of the condenser is to

The function of the condenser is to a) vaporize the liquid refrigerant b) change high pressure refrigerant vapour to liquid c) pressurize low pressure...

Which of the following is an example of a loss of latent heat?

Which of the following is an example of a loss of latent heat? i) water evaporating ii) ice melting iii) refrigerant evaporating iv) air cooling a)...

In the case of a simple ice box which of the following heat transfers is correct?

In the case of a simple ice box which of the following heat transfers is correct? a) Air loses latent heat, ice does not gain any heat. b) Air loses...

The pounding or banging of pipes and shuddering of fixtures caused by a shock wave resulting from a sudden stop of water flow in a pipe results in which of the following sounds?

The pounding or banging of pipes and shuddering of fixtures caused by a shock wave resulting from a sudden stop of water flow in a pipe results in which...

What is the correct sequence, from start to finish, needed to replace a washer in a faucet?

What is the correct sequence, from start to finish, needed to replace a washer in a faucet? i) Unscrew the packing nut and remove the spindle. ii)...

The blow off valve in a storage heater is used to

The blow off valve in a storage heater is used to a) eliminate pressure build-up in the heater. b) monitor unsafe temperatures. c) release steam...

Which of the following statements about footing drains is true?

Which of the following statements about footing drains is true? a) Installed to prevent an accumulation of ground water around the building foundations. b)...

Corrugations in outside aluminum sheet metal conductors is required

Corrugations in outside aluminum sheet metal conductors is required a) to increase flow speed of storm water. b) to decrease potential for blockage. c)...

Which of the following statements is true?

Which of the following statements is true? a) Branch line connections to the waste stack should be connected at an angle of more than 45 degrees. b)...

Negative pressure in a drainage system may result in which of the following problems?

Negative pressure in a drainage system may result in which of the following problems? a) clogging of drain pipes b) scale of build-up in water closets c)...

Sewer smells coming from a floor drain in a washroom can be a problem if the floors of the washroom are not cleaned often. Which of the following courses of action is the simplest way to stop the smell from coming out of the drain?

Sewer smells coming from a floor drain in a washroom can be a problem if the floors of the washroom are not cleaned often. Which of the following courses...

Which of the following has a trap as an integral part of the fixture?

Which of the following has a trap as an integral part of the fixture? a) water closet b) sink c) storm drain d) sewer e) sump pump Answer:&nb...

Drain traps serve which of the following purposes:

Drain traps serve which of the following purposes: i) to seal the outlet fixture ii) to prevent back flow of sewer gas iii) to deflect grease and...

Temperature relief devices are effective in eliminating the following problem:

Temperature relief devices are effective in eliminating the following problem: a) scale build-up in the system b) flashing of water into steam when...

Which of the following statements about pressure relief valves is false?

Which of the following statements about pressure relief valves is false? a) The valve may be installed anywhere in the hot water system close to...

The backflow prevention method which consists of two independently acting check valves with an automatic operating pressure differential relief valve located between the two check valves is called

The backflow prevention method which consists of two independently acting check valves with an automatic operating pressure differential relief valve...

In a circulating hot water system automatic air vents serve which of the following functions?

In a circulating hot water system automatic air vents serve which of the following functions? a) They cool the water in the storage tank to increase...

In a circulating hot water system the municipal distribution systems and/or local storage tanks are used for which of the following reasons.

In a circulating hot water system the municipal distribution systems and/or local storage tanks are used for which of the following reasons. a) Cold...

Which of the following is not an element found in a circulating hot water system?

Which of the following is not an element found in a circulating hot water system? a) A fire recoil element b) Air vents c) Heaters d) Back flow valves e)...

Which of the following statements about Non Circulating hot water systems is true?

Which of the following statements about Non Circulating hot water systems is true? a) The systems have a return line. b) The systems are used in...

When the maximum building demand for water is always less than the maximum flow available from a municipal or local distribution system which of the following systems can be used?

When the maximum building demand for water is always less than the maximum flow available from a municipal or local distribution system which of the...

The system which has a storage tank above the highest fixture in the system is called

The system which has a storage tank above the highest fixture in the system is called a) an upfeed system b) a constant pressure system with suction...

Which of the following statements about a constant pressure system with Pneumatic Tank is false?

Which of the following statements about a constant pressure system with Pneumatic Tank is false? a) Water entering directly into the pump suction...

In large buildings approximately what percentage of the electrical load is lighting?

In large buildings approximately what percentage of the electrical load is lighting? a) 60% b) 65% c) 70% d) 75% e) 80% Answer: ...

The life safety code requires that emergency lighting be provided for means of exit in

The life safety code requires that emergency lighting be provided for means of exit in a) places of assembly of less than 300 people b) all occupied...

Most dimmer switches sold today

Most dimmer switches sold today a) divert some current through a variable resistor b) can be used with incandescent or fluorescent lighting c) save...

Occupancy sensors are

Occupancy sensors are a) semi-automatic switches b) self-regulating switches c) automatic switches d) modulating switches e) packaged switches ...

An advantage of low voltage switching is

An advantage of low voltage switching is a) that local and remote control of lights is permitted b) the wiring does not require conduits c) changes...

When control for multiple locations is required

When control for multiple locations is required a) a 4-way switch is used b) an off-on switch is used c) two 2-way switches are used d) three or...

Direct lighting systems

Direct lighting systems a) have a higher initial cost than indirect lighting b) have greater glare control c) are more energy efficient than indirect...

Ambient lighting can be improved by two types of lighting:

Ambient lighting can be improved by two types of lighting: a) direct and indirect b) natural and artificial c) fluorescent and incandescent d) reflective...

When designing a lighting system which of the following should be considered?

When designing a lighting system which of the following should be considered? a) initial cost b) operating cost c) maintenance cost d) all of the...

A luminaire is a

A luminaire is a a) type of light reflector b) type of light refractor c) lamp ballast d) complete lighting unit e) type of lamp Answer: ...