TRAVIS CANNING
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power engineering 3b2 Quiz on for everyone quiz, created by TRAVIS CANNING on 28/02/2016.

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TRAVIS CANNING
Created by TRAVIS CANNING over 8 years ago
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Question 1 of 24

1

In an ammonia absorption system, the strong liquor is composed of which of the following?

Select one of the following:

  • Ammonia and salt

  • Ammonia and brine

  • Water and ammonia

  • None of the above

  • All of the above

Explanation

Question 2 of 24

1

At a pressure of around 240 kpa, ammonia will boil off at a temperature of about___, in the evaporator by absorbing heat from the medium to be cooled?

Select one of the following:

  • -89 degrees

  • -65 degrees

  • -15 degrees

  • 10 degrees

  • None of the above

Explanation

Question 3 of 24

1

An intercooler used in a compression refrigeration system serves to do which of the following?

Select one of the following:

  • Reduce the vapor temperature

  • Increase vapor density

  • Permits a decrease in the power consumption of the high pressure compressor

  • All of the above

  • None of the above

Explanation

Question 4 of 24

1

Which of the following is incorporated between the discharge and suction of two separate single stage compressors in order to remove some of the heat added in the low pressure stage?

Select one of the following:

  • Intercooler

  • Aftercooler

  • Evaporator

  • Condenser

  • None of the above

Explanation

Question 5 of 24

1

In order to handle large volumes of vapor coming from the evaporator, multi- stage plants may employ which of the following for the first of low pressure stage?

Select one of the following:

  • Vaporization Compressor

  • Booster compressor

  • Variable speed compressor

  • All of the above

  • None of the above

Explanation

Question 6 of 24

1

Which of the following maintains a constant level of liquid refrigerant in the evaporator?

Select one of the following:

  • Expansion valve

  • Liquid receiver

  • Evaporator float valve

  • None of the above

  • All of the above

Explanation

Question 7 of 24

1

The different types of refrigeration plants are which of the following?

Select one of the following:

  • Constant Expansion system

  • Direct system

  • Indirect system

  • B and C

  • All of the above

Explanation

Question 8 of 24

1

In the duplex compressor system, the condenser for the first stage is the evaporator for the second stage?

Select one of the following:

  • True
  • False

Explanation

Question 9 of 24

1

Which of the following are different types of construction for an evaporator?

Select one of the following:

  • Bare tube

  • Finned Tube

  • Plate surface

  • 1 and 2

  • All of the above

Explanation

Question 10 of 24

1

Which of the following are major components of the high pressure ammonia refrigeration system?

Select one of the following:

  • Compressor

  • Condenser

  • Evaporator

  • Liquid Receiver

  • All of the above

Explanation

Question 11 of 24

1

Some of the most common refrigerants used today are which of the following?

Select one of the following:

  • Refrigerant R- 12

  • Refrigerant R- 22

  • Refrigerant R- 134a

  • Ammonia

  • All of the above

Explanation

Question 12 of 24

1

Which of the following properties should fluids, used as a refrigerant, possess?

Select one of the following:

  • Non flammable

  • Non corrosive

  • Non toxic

  • Operate under low pressure (low boiling point)

  • All of the above

Explanation

Question 13 of 24

1

When starting up a compressor and a leak has been found, which of the following steps would be the corrective action?

Select one of the following:

  • Shut down the compressor until the leak is repaired

  • Continue with the start up and ignore the leak

  • If possible, bypass the line which is leaking

  • All of the above

  • None of the above

Explanation

Question 14 of 24

1

What would be the final step in the start up of a compressor?

Select one of the following:

  • Check the gearbox oil level

  • Slowly load up the compressor

  • Close the breaker for the compressor motor

  • Check for leaks and unusual noises

  • None of the above

Explanation

Question 15 of 24

1

Which of the following steps comes first when starting up a compressor that was taken down for maintenance?

Select one of the following:

  • Start the compressor

  • Check oil levels

  • Ensure no one is working on the compressor

  • Turn on the cooling water for the compressor cylinders

  • Open the suction and discharge valves

Explanation

Question 16 of 24

1

Which of the following should never be placed in the line between compressor and receiver, unless a safety valve is used?

Select one of the following:

  • Drain valve

  • Pressure regulator

  • Orifice plate

  • Shut off valve

  • None of the above

Explanation

Question 17 of 24

1

Air receivers serve to perform which of the following functions?

Select one of the following:

  • Act as a reservoir in the compressed air system

  • Acts to dampen pulsations in the discharge pressure

  • Allows moisture, dust, and oil to settle out from the air

  • All of the above

  • None of the above

Explanation

Question 18 of 24

1

The standard desiccant used in an air dryer system is which of the following?

Select one of the following:

  • Activated alumina

  • Silica gel

  • Potassium oxide

  • 1 and 2

  • None of the above

Explanation

Question 19 of 24

1

Which of the following are components of an air dryer system?

Select one of the following:

  • Prefilters

  • Dryer tanks or towers

  • Afterfilters

  • All of the above

  • None of the above

Explanation

Question 20 of 24

1

Which of the following functions does the dry air receiver serve to do?

Select one of the following:

  • Stabilizes the system pressure as it acts as a demand reservoir

  • Helps avoid overloading the air purification system with surges in air demand

  • Dampens out the dew point and temperature spikes

  • All of the above

  • None of the above

Explanation

Question 21 of 24

1

Which of the following functions does the wet air receiver serve to do?

Select one of the following:

  • Stabilize flow though the air driers on system load changes

  • Additional moisture separation

  • Provides storage capacity to prevent rapid compressor cycling

  • All of the above

  • none of the above

Explanation

Question 22 of 24

1

What is the main purpose of an intercooler?

Select one of the following:

  • To remove any entrained moisture

  • To reduce the volume of the air

  • To maintain the outlet temperature

  • All of the above

  • None of the above

Explanation

Question 23 of 24

1

Which of the following are some of the reasons for using intercoolers and aftercoolers to cool down the air?

Select one of the following:

  • To condense out water vapor and drain from the system

  • To remove all oil vapors that will have detrimental effects on the system

  • Decrease the amount of power to compress the air

  • To make cylinder lubrication more effective

  • All of the above

Explanation

Question 24 of 24

1

Some common methods used to reduce “surging” would be?

Select one of the following:

  • Throttling the inlet valve

  • Reducing the compressor speed

  • Venting of the discharge line to atmosphere, or to the suction line

  • All of the above

Explanation

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