TRAVIS CANNING
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power engineering 3b2 Quiz on for everyone quiz 2, 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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for everyone quiz 2

Question 1 of 19

1

“Surging” would be best described as which of the following?

Select one of the following:

  • A reversal of flow within the compressor

  • A sudden increase in air temperature

  • A sudden decrease in air temperature

  • A malfunction caused by the micro- processing unit

  • None of the above

Explanation

Question 2 of 19

1

Which of the following methods are used to control the load for rotary compressors?

Select one of the following:

  • Modulating inlet method

  • Start- stop Method

  • Load- unload method

  • Microprocessor- based control system

  • All of the above

Explanation

Question 3 of 19

1

Different methods used to control the load for a compressor include which of the following?

Select one of the following:

  • Inlet air unloader

  • Suction line unloading valve

  • Inlet air modulating valve

  • All of the above

  • None of the above

Explanation

Question 4 of 19

1

The free air capacities of axial flow compressors range form___m3 to___m3/min ?

Select one of the following:

  • 1.5- 200

  • 2.7-1500

  • 2.8- 3700

  • 1.9- 8000

  • None of the above

Explanation

Question 5 of 19

1

What is the main advantage of an axial flow compressor?

Select one of the following:

  • Low maintenance

  • Higher efficiency

  • Trouble free service

  • All of the above

  • None of the above

Explanation

Question 6 of 19

1

Which of the following are advantages of the centrifugal compressor?

Select one of the following:

  • Low maintenance costs

  • Simple, rugged construction

  • Large volumes of oil free air

  • All of the above

  • None of the above

Explanation

Question 7 of 19

1

In a centrifugal compressor, energy is transferred from the impeller to the gas in the from of which of the following?

Select one of the following:

  • Velocity

  • Pressure

  • Velocity and pressure

  • All of the above

  • None of the above

Explanation

Question 8 of 19

1

In a rotary type screw compressor, the spiral valve is used to do which of the following?

Select one of the following:

  • Prevent dust and dirt from entering the compressor

  • Regulate the amount of air to the compressor

  • Open and close bypass ports in the stator

  • All of the above

  • None of the above

Explanation

Question 9 of 19

1

Which of the following devices removes any entrained moisture from the air leaving the compressor?

Select one of the following:

  • Fluid cooler

  • Air after cooler

  • After filter

  • Moisture separator

  • None of the above

Explanation

Question 10 of 19

1

What is the main difference between the rotary compressor and the reciprocating compressor?

Select one of the following:

  • Difference in pressures

  • The difference in size

  • Use of inlet and discharge valves

  • All of the above

  • None of the above

Explanation

Question 11 of 19

1

The most common designs of a rotary compressor are which of the following?
Sliding vane
Rotary lobe
Rotary screw
Sliding lobe
Rotary vane

Select one of the following:

  • Sliding Vane, Rotary Lobe, Rotary vane

  • Sliding Vane, Rotary Lobe, Rotary Screw

  • Sliding Vane, Sliding Lobe, Rotary vane

Explanation

Question 12 of 19

1

External lubrication involves the lubrication of all moving parts external to the cylinder or casing, such as?
Piston
Crosshead
Crankshaft bearings
Connecting rod bearings
All of the above

Select one of the following:

  • Crosshead, crankshaft bearings, connecting rod bearings

  • crankshaft bearings, crosshead, piston

Explanation

Question 13 of 19

1

Lubricating oil is necessary in a compressor to serve which of the following purposes?

Select one of the following:

  • Reduce friction

  • Remove the heat produced by friction

  • Coat the surfaces and reduce corrosion

  • Provide a seal around the rings, vanes, and valves

  • All of the above

Explanation

Question 14 of 19

1

If the cylinder of a reciprocating compressor is of oil free operation, the piston rings will be made of which of the following?

Select one of the following:

  • Stainless steel

  • Cast iron

  • Aluminum

  • Teflon or carbon

  • All of the above

Explanation

Question 15 of 19

1

In a reciprocating compressor, air cooling has which of the following advantages over water cooling?

Select one of the following:

  • Simple construction

  • Less piping hazards

  • No freezing

  • All of the above

  • None of the above

Explanation

Question 16 of 19

1

In the _______________ compressor one of the cylinders acts as a cushion, while the other acts to compress the air?

Select one of the following:

  • Tandem

  • Free piston

  • Single stage

  • Double stage

  • None of the above

Explanation

Question 17 of 19

1

Reciprocating compressors may be divided into which of the following?

Select one of the following:

  • Single stage

  • Two stage

  • Single acting

  • Double acting

  • Tandem

  • Free piston

  • All of the above

Explanation

Question 18 of 19

1

Which of the following statements is true?

Select one of the following:

  • Compression ratio is the ratio of discharge gauge pressure to the intake absolute pressure

  • A high compression ratio in a single cylinder results in a high volumetric efficiency and a high discharge temperature

  • Intercoolers are used to cool the discharged air before it is delivered to it’s point of use or the receiver

  • All of the above

  • None of the above x

Explanation

Question 19 of 19

1

Intercoolers serve as a means to do which of the following?

Select one of the following:

  • Cool down the temperature of the air

  • Remove any entrained moisture in the air

  • Decrease the power required to compress the air in the following stage

  • All of the above

  • None of the above

Explanation

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