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Steam Power Plant: 2

Total questions: 15

Worksheet time: 8mins

Name
Class
Date
1.

The formation of gas bubbles in a liquid is called

a)

bubbling

b)

foaming

c)

priming

d)

carryover

2.

 In a condensing steam engine

a)

condensed steam is supplied

b)

steam condenses inside cylinder

c)

steam condenses as soon as it leaves the cylinder

d)

exhaust steam is condensed in a condenser

3.

Which of the following is the pressure applied at the nozzle discharge section?

a)

Stagnant pressure

b)

Critical pressure

c)

Back pressure

d)

Atmospheric pressure

4.

When the back pressure is reduced to lowest exit pressure, the mass flow reaches a maximum value and the flow is said to be :

a)

Stacked

b)

Choked

c)

Stuck-up

d)

Clog-up

5.

For back pressure valves, abrupt changes in fluid properties occur in a very thin section of converging - diverging nozzle under supersonic flow conditions, creating

a)

sound wave

b)

tidal wave

c)

shock wave

d)

none of these

6.

An inventor proposes to develop electrical power by withdrawing heat from the geyser fields of northern California and converting it all to work in power turbines. This scheme will not work because:

a)

the geyser fields have only a limited lifetime

b)

the salinity of the steam is too great

c)

it violates the first law of thermodynamics

d)

it violates the second law of thermodynamics

7.

Measure of ability of a boiler to transfer the heat given by the furnace to the water and steam is

a)

grate efficiency

b)

stroke efficiency

c)

furnace efficiency

d)

boiler efficiency

8.

A goose neck is installed in the line connecting a steam gauge to a boiler to:

a)

maintain constant steam flow

b)

protect the gauge element

c)

prevent steam knocking

d)

maintain steam pressure

9.

When droplets of water are carried by steam in the boiler.

a)

Priming

b)

Foaming

c)

Carryover

d)

Embrittlement

10.

The process in which heat energy is transferred to a thermal energy storage device is known as:

a)

adiabatic

b)

regeneration

c)

intercooling

d)

isentropic

11.

A heat transfer device that reduces a thermodynamic fluid from its vapor phase to its liquid phase such as in vapor compression refrigeration plant or in a condensing steam power plant.

a)

Flash vessel

b)

Cooling tower

c)

Condenser

d)

Steam separator

12.

In a steam generator with good combustion control, what occurs if the load is increased?

a)

Air temperature leaving air heater decreases

b)

Air temperature entering air heater increases

c)

Furnace pressure is approximately constant

d)

Economizer gas outlet temperature decreases

13.

A liquid boils when its vapor pressure equals

a)

the gage pressure

b)

the critical pressure

c)

the ambient pressure

d)

one standard atmosphere

14.

A chemical method of feedwater treatment which uses calcium hydroxide and sodium carbonate as reagents.

a)

Thermal treatment

b)

Lime soda treatment

c)

   Demineralization process

d)

Ion exchange treatment

15.

Which of the following factors does working pressure of boiler doesn’t depend?

a)

Tensile strength of shell

b)

Thickness of shell

c)

Factor of safety

d)

Type of fuel being fired