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power engineering 3b2 Test sobre for everyone quiz, creado por TRAVIS CANNING el 28/02/2016.

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TRAVIS CANNING
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for everyone quiz

Pregunta 1 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Ammonia and salt

  • Ammonia and brine

  • Water and ammonia

  • None of the above

  • All of the above

Explicación

Pregunta 2 de 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?

Selecciona una de las siguientes respuestas posibles:

  • -89 degrees

  • -65 degrees

  • -15 degrees

  • 10 degrees

  • None of the above

Explicación

Pregunta 3 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 4 de 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?

Selecciona una de las siguientes respuestas posibles:

  • Intercooler

  • Aftercooler

  • Evaporator

  • Condenser

  • None of the above

Explicación

Pregunta 5 de 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?

Selecciona una de las siguientes respuestas posibles:

  • Vaporization Compressor

  • Booster compressor

  • Variable speed compressor

  • All of the above

  • None of the above

Explicación

Pregunta 6 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Expansion valve

  • Liquid receiver

  • Evaporator float valve

  • None of the above

  • All of the above

Explicación

Pregunta 7 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Constant Expansion system

  • Direct system

  • Indirect system

  • B and C

  • All of the above

Explicación

Pregunta 8 de 24

1

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

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 9 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Bare tube

  • Finned Tube

  • Plate surface

  • 1 and 2

  • All of the above

Explicación

Pregunta 10 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Compressor

  • Condenser

  • Evaporator

  • Liquid Receiver

  • All of the above

Explicación

Pregunta 11 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Refrigerant R- 12

  • Refrigerant R- 22

  • Refrigerant R- 134a

  • Ammonia

  • All of the above

Explicación

Pregunta 12 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Non flammable

  • Non corrosive

  • Non toxic

  • Operate under low pressure (low boiling point)

  • All of the above

Explicación

Pregunta 13 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 14 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 15 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 16 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Drain valve

  • Pressure regulator

  • Orifice plate

  • Shut off valve

  • None of the above

Explicación

Pregunta 17 de 24

1

Air receivers serve to perform which of the following functions?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 18 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Activated alumina

  • Silica gel

  • Potassium oxide

  • 1 and 2

  • None of the above

Explicación

Pregunta 19 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Prefilters

  • Dryer tanks or towers

  • Afterfilters

  • All of the above

  • None of the above

Explicación

Pregunta 20 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 21 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 22 de 24

1

What is the main purpose of an intercooler?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 23 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 24 de 24

1

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

Selecciona una de las siguientes respuestas posibles:

  • Throttling the inlet valve

  • Reducing the compressor speed

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

  • All of the above

Explicación

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