4.11 Refrigeration Auxillaries and Operation

Description

power engineering 3b2 Quiz on 4.11 Refrigeration Auxillaries and Operation, created by TRAVIS CANNING on 01/03/2016.
TRAVIS CANNING
Quiz by TRAVIS CANNING, updated more than 1 year ago
TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
7
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Resource summary

Question 1

Question
Suction pressure too low might be due to:
Answer
  • System load too high
  • Not enough condenser cooling water
  • Receiver level too high
  • Receiver level too low
  • Faulty or closed expansion valve

Question 2

Question
When changing ammonia systems, frost on the drum bottom indicates:
Answer
  • Too much refrigerant
  • The ambient temperature is too high
  • Refrigerant drum is empty or very nearly empty
  • Refrigerant drum is still full
  • Pressure is too high

Question 3

Question
A low-pressure control in a refrigerating system can be used for:
Answer
  • Condenser pressure control
  • Starting and stopping the compressor
  • Purging non-condensable gases
  • Keeping the receiver pressure from getting too high
  • Evaporator pressure control

Question 4

Question
In an indirect ammonia system using brine and water-cooled condenser, the discharge pressure is controlled by:
Answer
  • The load on the brine
  • Regulating the expansion valve
  • Regulating the cooling water to the condenser
  • Using a pressure release valve
  • The amount of ammonia refrigerant used

Question 5

Question
Where public occupancy is a concern when using Safety Group 2 refrigerants the safest systems are:
Answer
  • Direct refrigeration
  • Indirect systems
  • Any available system
  • Automatic refrigeration
  • The C/S/A approved refrigeration systems

Question 6

Question
The most efficient method of condenser cooling is
Answer
  • Air cooled
  • Water cooled
  • Latent heat cooled
  • Diffusion cooled
  • Cooled by another refrigeration unit

Question 7

Question
Before changing a new refrigeration installation:
Answer
  • It should be filled with water first
  • The entire refrigerant containing system must be thoroughly tested for performance
  • It should be filled with refrigerant and tested for performance
  • The entire refrigerant containing system must be completely filled with water and hydrostatically tested
  • It should be filled with hydrogen and tested

Question 8

Question
In a indirect ammonia vapour compression system using brine, the suction pressure is controlled by:
Answer
  • The load on the brine
  • The flow of the cooling water to the suction side of the compressor
  • Throttling the metering valve
  • An equalization valve
  • The flow of the condensing water to the condenser

Question 9

Question
Refrigeration application uses could include:
Answer
  • Heating methods in industry
  • Gas distillation process
  • Refrigerant oil purification
  • Air conditioning humidifying
  • Air conditioning or gas dehydration

Question 10

Question
The capillary tube has a
Answer
  • Very small diameter
  • Medium sized diameter
  • Large diameter
  • Convergent-divergent cross-section
  • Concaved cross sectional area
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