TRAVIS CANNING
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power engineering 3b2 Quiz on 3b2 quiz 3, created by TRAVIS CANNING on 26/02/2016.

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TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
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3b2 quiz 3

Question 1 of 37

1

While gas turbines exist in many different designs, every gas turbine has three major components, compressor section, combustion section, and:

Select one of the following:

  • Turbine section

  • Shell section

  • Steam section

  • Low pressure section

  • High pressure section

Explanation

Question 2 of 37

1

Ambient air entering the combustion chamber is first pressurized to about (?) Kpa

Select one of the following:

  • 50 to 100

  • 500 to 1000

  • 1100 to 3000

  • 3000 to 5000

  • 5000 to 10000

Explanation

Question 3 of 37

1

In the single shaft arrangements the compressor, turbine and load are all connected and rotate

Select one of the following:

  • Opposite of one another

  • Counterclockwise

  • Clockwise

  • Together

  • None of the above

Explanation

Question 4 of 37

1

A disadvantage of a closed style gas turbine is:

Select one of the following:

  • Cooling water is needed

  • The working fluid is dirty

  • Only cheap fuel can be used

  • The working fluid may support combustion

  • Low pressure, Low output

Explanation

Question 5 of 37

1

A gas turbine installation involves a number of additional components, systems and equipment that vary widely depending on the type of gas turbine, its location, environmental conditions and:

Select one of the following:

  • Cost

  • Size

  • Application

  • Pressure rating

  • None of the above

Explanation

Question 6 of 37

1

Many gas turbines are contained in an enclosure that protects it from the environment, provides protection for personnel in case of failure and:

Select one of the following:

  • Keeps costs down

  • Keep it clean

  • Prevent damage

  • Reduce noise

Explanation

Question 7 of 37

1

Modern gas turbines are able to reach efficiencies of (?) in simple cycle mode without the cycle improvements or combined cycle:

Select one of the following:

  • 5-10%

  • 15-20%

  • 25-30%

  • 35-40%

  • 45-50%

Explanation

Question 8 of 37

1

On a gas turbine the most common cycle improvements to be made is:

Select one of the following:

  • Inter cooling

  • After cooling

  • Reheating

  • Combined cycle

  • Regeneration

Explanation

Question 9 of 37

1

A highly efficient and capable compressor is critical for the efficient operation of a gas turbine. Two types of compressors are used in gas turbines are Centrifugal and:

Select one of the following:

  • Differential

  • Positive flow

  • Negative flow

  • Radial

  • Axial

Explanation

Question 10 of 37

1

Advantages of the radial or compressor are simplicity, short length and:

Select one of the following:

  • Cost

  • Size

  • Strength

  • Noise reduction

  • Power

Explanation

Question 11 of 37

1

For a gas turbine there are three basic designs for combustors. The can-annular, annular and:

Select one of the following:

  • Annular-can

  • Can

  • Single can

  • Double can

  • None of the above

Explanation

Question 12 of 37

1

About (?) per cent of the air entering the combustor is mixed with the fuel in the flame tube as combustion air; the remainder flows on the outside of the tube and services as cooling air.

Select one of the following:

  • 10

  • 20

  • 30

  • 40

  • 50

Explanation

Question 13 of 37

1

Turbines can be of the axial-flow or (?) type:

Select one of the following:

  • Differential flow

  • Radial flow

  • Radial inflow

  • Axial inflow

  • None of the above

Explanation

Question 14 of 37

1

What is used in blade cooling on a gas turbine?

Select one of the following:

  • Air

  • Oxygen

  • Nitrogen

  • Fans

  • All of the above

Explanation

Question 15 of 37

1

An automatic emergency trip system closes the main fuel shutoff valve if:

Select one of the following:

  • The Lubricating oil pressure drops to an unsafe pressure

  • The exhaust temperature exceeds the allowable limit

  • Either of the rotor speed becomes excessive

  • All of the above

  • None of the above

Explanation

Question 16 of 37

1

A number of protective devices will first alarm and then shutdown the engine if certain levels are exceeded. They normally protect against:

Select one of the following:

  • Power turbine overspeed

  • Exhaust gas temperatures higher than the maximum limit

  • Excessive vibration

  • Excessive oil and bearing temperatures

  • All of the above

Explanation

Question 17 of 37

1

The temperature of the air entering the gas turbine has a great impact on its operation and performance. As the air temperature decreases, its

Select one of the following:

  • Density decreases

  • Density increases

  • Pressure increases

  • None of the above

  • Pressure decreases

Explanation

Question 18 of 37

1

A gas turbine will produce more power at:

Select one of the following:

  • Higher temperatures

  • Lower temperatures

  • Higher pressures

  • Lower pressures

  • All of the above

Explanation

Question 19 of 37

1

All lubricating systems provide two basic functions, to lubricate sliding surfaces in the bearing and:

Select one of the following:

  • Keep the bearing clean

  • Cool the bearings

  • Keep water away

  • Reduce corrosion

  • All of the above

Explanation

Question 20 of 37

1

Gas turbines use two different types of bearings, Antifriction bearings and:

Select one of the following:

  • Greased bearings

  • Roller

  • Ball

  • Radial

  • Rotor

Explanation

Question 21 of 37

1

Maintenance of fuel gas systems are relatively maintenance free and automatic protection is usually provided. Maintenance operators may do consist of:

Select one of the following:

  • Checking for fuel gas leaks

  • Monitoring pressure and temperature

  • Changing fuel filters

  • Calibrating instrumentation and testing protective devices

  • All of the above

Explanation

Question 22 of 37

1

Fuel for a gas turbine that would promote the most efficient combustion and produce the lowest environmental emissions world be:

Select one of the following:

  • Methane

  • Ammonia

  • Natural gas

  • Fuel gas

  • Kerosene

Explanation

Question 23 of 37

1

A gas turbine can operate on a wide range of liquid fuels such as blended heavy distillantes, residuals and heavy ash crudes, and:

Select one of the following:

  • Distillantes

  • Blended ash crudes

  • Low ash crudes

  • All of the above

  • None of the above

Explanation

Question 24 of 37

1

A liquid fuel which requires considerable cleaning and treatment would be:

Select one of the following:

  • Kerosene

  • Distillants

  • Low ash crudes

  • Blended heavy distillants

  • Heavy ash crudes

Explanation

Question 25 of 37

1

NOx Emissions are formed during combustion from the reaction of:

Select one of the following:

  • Water or steam

  • Soda ash

  • Lime

  • Air

  • None of the above

Explanation

Question 26 of 37

1

What system can be used to provide the initial rotation of the main compressor?

Select one of the following:

  • Pneumatic starters using compressed air or gas

  • Electric motors

  • Small diesel engines

  • Steam turbine expanders

  • All of the above

Explanation

Question 27 of 37

1

What problems to sagging or bowing cause in a gas turbine?

Select one of the following:

  • Prevent start up

  • High vibration

  • Excessive heat

  • A and B

  • None of the above

Explanation

Question 28 of 37

1

Various methods of inlet cooling used today are spray cooling, fog cooling and:

Select one of the following:

  • Special evaporative pads

  • Steam cooling

  • Water pan cooling

  • Forced Air cooling

  • Natural air cooling

Explanation

Question 29 of 37

1

Anti-icing systems may operate by:

Select one of the following:

  • Beating off the ice

  • Installing heating coils

  • Feeding heated air from some other source into air intake

  • B and C

  • None of the above

Explanation

Question 30 of 37

1

In an internal combustion engine what are the three major types of fuels?

Select one of the following:

  • Gasoline, Diesel, and kerosene

  • Gasoline, Natural gas, Gaseous fuels

  • Gasoline, Fuel oils, and Diesel

  • Gasoline, Gaseous fuels, and Fuel oils

  • None of the above

Explanation

Question 31 of 37

1

For a normal shutdown of a gas turbine the procedure is basically the reverse of a startup procedure.

Select one of the following:

  • True
  • False

Explanation

Question 32 of 37

1

When a fast shutdown for a gas turbine has been initiated the cooldown period is eliminated and the fuel valve is closed immediately.

Select one of the following:

  • True
  • False

Explanation

Question 33 of 37

1

To perform an off-line waterwash, the engine is stopped and does not need to cool first.

Select one of the following:

  • True
  • False

Explanation

Question 34 of 37

1

To perform an on-line wash the gas turbine is slowed slightly and has no need to cool.

Select one of the following:

  • True
  • False

Explanation

Question 35 of 37

1

One major difference in a diesel engine compared to the gasoline engine is:

Select one of the following:

  • One engine is larger then the other

  • Gasoline engines do not require a spark for ignition

  • Gasoline engines require compression for ignition

  • Diesel engines do not require a spark for ignition

  • All of the above

Explanation

Question 36 of 37

1

How many camshafts are there in a Combustion engine?

Select one of the following:

  • 1

  • 2

  • 3

  • 4

  • 5

Explanation

Question 37 of 37

1

A cylinder head on a combustion engine is made of:

Select one of the following:

  • Special Heat resisting cast iron

  • Aluminum

  • Steal

  • Heat treated nickel iron alloy

  • Heat treated Steal

Explanation

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