TRAVIS CANNING
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power engineering 3b2 Quiz on power prep quiz 4, created by TRAVIS CANNING on 27/02/2016.

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TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
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power prep quiz 4

Question 1 of 16

1

The low pressure end of a turbine may be protected from over pressure protection by an atmospheric relief valve and/or

Select one of the following:

  • overspeed trip

  • explosion diaphragm

  • vacuum trip relay

  • vibration monitors

  • noise muffler

Explanation

Question 2 of 16

1

condensers may be divided into two basic groups namely,

Select one of the following:

  • direct and indirect

  • jet and surface

  • atmospheric and vacuum

  • contact and surface

  • evaporative and spray

Explanation

Question 3 of 16

1

Jet condensers are in limited use today mainly due to:

Select one of the following:

  • maintaining cooling water quality

  • cost

  • they require a large floor space

  • corrosion attack

  • all of the above

Explanation

Question 4 of 16

1

Condenser waterboxes are typically made from:

Select one of the following:

  • carbon steel

  • stainless steel

  • cast iron

  • aluminum

  • nickel or brass

Explanation

Question 5 of 16

1

condenser tube sheets are typically made from

Select one of the following:

  • carbon steel

  • stainless steel

  • cast iron

  • aluminum

  • admiralty brass

Explanation

Question 6 of 16

1

A large heating surface is utilized in a surface condenser for maximum efficiency. This is largely done by:

Select one of the following:

  • putting in as many tubes as possible

  • using large diameter tubes

  • using small diameter tubes

  • using stainless steel tubes

  • none of the above

Explanation

Question 7 of 16

1

To allow for differential expansion for the shell and tubes in a condesnser, which of the following methods may be used:
1. tube packing 2. expansion bends. 3. elastic materials 4. expansion joints to the shell 5. solid weld construction 6. slip expansion tubes

Select one of the following:

  • 1,2

  • 2,3

  • 3,4

  • 4,5

  • 1,4

Explanation

Question 8 of 16

1

Safety fittings on a condenser may include
1. gage glass
2. relief valve
3. corrosion coupons
4. low water alarm
5. vacuum trip relay
6. leak detection devices

Select one of the following:

  • 1,2,3,4,5

  • 1,2,5

  • 1,2,4,5

  • 1,2,3,5

  • 2,3,4,5

Explanation

Question 9 of 16

1

The main purpose of waterbox staybolts is to

Select one of the following:

  • support the tubesheet from cooling water pressure

  • support the tube sheet from condenser vacuum

  • prevent the condenser tubes from buckling

  • act as a sacrificial corrosion coupon

  • all of the above

Explanation

Question 10 of 16

1

non condensables in a condenser must be removed largely due to

Select one of the following:

  • the blanketing effect on the tubes

  • tube pitting

  • increase the condensate ph

  • lowers the condensate ph

  • increases the condenser vacuum

Explanation

Question 11 of 16

1

An air ejector

Select one of the following:

  • increases the vacuum on a turbine condenser

  • prevents non-condensable gasses from entering the condenser

  • converts heat energy into kinetic energy

  • utilizes a vacuum pump

  • may also be termed hogging ejector

Explanation

Question 12 of 16

1

The larges single heat loss in a steam power cycle is:

Select one of the following:

  • latent heat of evaporation of converting water to steam

  • condensing steam

  • creating a turbine vacuum

  • subcooled condensate

Explanation

Question 13 of 16

1

Air that enters a surface condenser:

Select one of the following:

  • causes pitting on the cooling water tubes

  • will increase the condenser pressure

  • will cause the condensate to turn slightly acidic and cause corrosion

  • will cavitate the extraction pump

  • has no effect on the operation of the plant

Explanation

Question 14 of 16

1

the best test method to detect condenser cooling water leaks is

Select one of the following:

  • conductivitity

  • ph

  • silica

  • phosphate

  • color comparator

Explanation

Question 15 of 16

1

In a surface condenser:
1. packed tube ends allows the tube to move axially in the packing
2. deaeration is less efficient when the condensate is sub-cooled
3. there is no temperature differential expansion
4. when the inlet of the tube is exposed, it is also beaded over to prevent leakage

Select one of the following:

  • 1,2,3

  • 1,2,4,

  • 1,2

  • 3,4

  • 1,2,3,4

Explanation

Question 16 of 16

1

Prior to starting a large condensing turbine:

Select one of the following:

  • the jacking oil pump is started after the turbine has been put on barring

  • open all steam trap bypass valves

  • turn on oil coolers cooling water prior to firing up the boiler

  • put the condenser into operation

  • test the turbine overspeed trips

Explanation

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