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COGENERATION & RESIDUAL HEAT RECOVERY

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.
Which of the following is not a benefit of cogeneration
a)
Increased efficiency of energy conversion and use
b)
Reduced greenhouse gas emissions
c)
Reduced power factor
d)
Reduced transmission losses
2.
Cogeneration is the simultaneous generation of
a)
Heat and power
b)
Mechanical energy and power
c)
Steam and condensate
d)
All of the above
3.
The Ranking Cycle is related to
a)
Boiler
b)
Steam turbine
c)
Condenser
d)
All of the above
4.
What is an important advantage of closed-cycle gas turbine cogeneration systems?
a)
Working fluid remains clean and it does not cause corrosion or erosion
b)
Low capital costs
c)
High pressure of produced steam
d)
High temperature of produced steam
5.
The cogeneration system which has a high overall efficiency is the
a)
Gas turbine
b)
Back pressure steam turbine
c)
Reciprocating engine
d)
Combined cycle
6.
Which of the following statements is not correct
a)
A topping cycle plant generates electricity or mechanical power first
b)
A bottoming cycle plant generates heat first
c)
A bottoming cycle plant generates electricity or mechanical power first
d)
Both a and b
7.
How is the efficiency of cogeneration measured?
a)
Electrical conversion
b)
Thermal recovery
c)
Both a and b
d)
None of the above
8.
The cogeneration is not applicable to which type of industry?
a)
Sugar
b)
Paper and pulp
c)
Refinery
d)
Refractory / brick-making
9.
What is a typical efficiency of a cogeneration system?
a)
0.58
b)
0.68
c)
0.85
d)
0.95
10.
Which fuel type can be used in a gas turbine?
a)
Light fuel oil
b)
Natural gas
c)
Diesel
d)
All of the above
11.
Find the thermodynamic cycle not related to cogeneration
a)
Brayton cycle
b)
Rankine cycle
c)
Otto cycle
d)
Bell-Coleman cycle
12.
In a combined cycle power plant consisting of gas turbine and waste heat boiler, the exhaust gas temperature is ____.
a)
around 150 °C
b)
around 500 °C
c)
around 300 °C
d)
around 400 °C
13.
Heat to power ratio in a paper industry is in the range of ------------
a)
1.1 – 4.5
b)
1.5 – 2.5
c)
0.8 – 3.0
d)
1.5 – 2.5
14.
Heat to power ratio of combined cycle cogeneration is in the range of-------------
a)
4.0 – 5.0
b)
1.0 – 1.7
c)
2.0 – 10
d)
1.0 – 5.0
15.
Major advantage of waste heat recovery in industry is:
a)
reduction in pollution
b)
increase in efficiency
c)
both a & b
d)
none of the above
16.
Heat recovery equipment will be most effective when the temperature of flue gas is:
a)
250 C
b)
200 C
c)
400 C
d)
280 C
17.
Recuperator is used mainly as a waste heat recovery system in a ____ .
a)
boiler
b)
billet Reheating Furnace
c)
compressor
d)
none of the above
18.
Ceramic recuperators can withstand temperatures up to
a)
600 C
b)
1300 C
c)
1700 C
d)
950 C
19.
Typical waste gases temperature from glass melting furnace
a)
1000-1550 degree C
b)
800-950 degree C
c)
650–750 degree C
d)
760-815 degree C
20.
In a low to medium temperature waste heat recovery system which of the device is most suitable
a)
economiser
b)
heat wheels
c)
air preheater
d)
recuperator
21.
Recovery of heat from dryer exhaust air is a typical application of:
a)
waste heat recovery boiler
b)
heat pump
c)
heat wheels
d)
economizer
22.
Regenerator is widely used in:
a)
reheating Furnaces
b)
heat treatment furnaces
c)
baking Ovens
d)
glass melting furnaces
23.
An economizer is provided to reuse flue gas heat for
a)
Preheating the boiler feed water
b)
Preheating the combustion air
c)
Preheating the stock
d)
Preheating fuel
24.
Which of the following as capillary wick structure?
a)
Heat pump
b)
Heat pipe
c)
Heat wheel
d)
None of the above
25.
The exchanger typically used in the pressurizing section of a dairy plant is
a)
Plate heat exchanger
b)
Run around coil exchanger
c)
Shell and tube exchanger
d)
All of the above
26.
The waste heat source with the highest potential to recover quality waste heat is
a)
Cooling water
b)
Products leaving the process
c)
Flue gases
d)
Convective and radiant heat lost from exterior of equipment
27.
In terms of cost per MW compared to condensing sets of the same power, the back pressure turbines are?
a)
more expensive
b)
cheaper
c)
costly
d)
none of the mentioned
28.
 Which of these is not considered economical for cogeneration?
a)
a high fraction of electric to total energy
b)
a low fraction of electric to total energy
c)
a low fraction of total energy to electric energy
d)
none of the mentioned
29.
Back pressure turbine is placed between ____________
a)
Turbine & Pump
b)
Boiler & Pump
c)
Turbine & Heat Exchanger
d)
Boiler & Turbine
30.
 In a by-product power cycle
a)
the power is produced initially
b)
power production is in the middle stages of the cycle
c)
power production is after the cycle has ended
d)
none of the mentioned
31.

Which of the following depends on physical properties of fluids as well as geometry of the heat exchanger?

a)

Overall heat transfer coefficient

b)

Fouling coefficient

c)

LMTD (Log Mean Temperature Difference)

d)

Effectiveness

32.

A waste heat recovery system (Shell and Tube heat exchanger) receives hot fluid at 200°C and leaves at 70°C, cold medium enters at 30°C and leaves at 90°C, the type of flow involved in this is

a)

cross-flow

b)

co- current flow

c)

counter-current flow

d)

none of the above

33.

Corrosion in stack, Air Pre-Heater, Economizer is mainly influenced by

a)

Sulphur content in fuel

b)

Ash content in fuel

c)

Moisture content in fuel

d)

All of the above

34.

Which of the following waste heat recovery systems is of thermal storage type?

a)

ceramic recuperator

b)

metallic recuperator

c)

regenerative burner

d)

waste heat boiler

35.

Regenerator is used mainly along with a

a)

boiler

b)

high temperature furnace

c)

compressor

d)

gas turbine

36.

Which of the following heat recovery equipment works on a vapour compression cycle?

a)

thermo-compressor

b)

heat wheel

c)

heat pump

d)

heat pipe

37.

In a heat pump

a)

work is added to improve quality of waste heat

b)

heat is added to improve quality of waste heat

c)

steam is added to improve quality of waste heat

d)

air is added to improve quality of waste heat

38.

Heat wheels are mostly used in a situation of….

a)

high temperature exhaust gases

b)

heat exchange between large masses of air having small temperature differences

c)

heat transfer between a liquid and gas

d)

corrosive gases

39.

If the volatile matter in coal is low, which of the following equipment is the best waste heat recovery option in a boiler

a)

economiser

b)

air preheater

c)

deaerator

d)

heat pipe

40.

The major limitation of metallic recuperator is -------

a)

limitation of handling COx, NOx etc.

b)

limitation of reduced life for handling temperature more than 1000°C

c)

manufacturing difficulty of the required design

d)

none of the above

41.

The heat recovery device in which high conductivity bricks are used for storing heat is

a)

heat pipe

b)

heat pump

c)

thermo compressor

d)

regenerator

42.

Bottoming cycle cogeneration is characterized by

a)

Heat first power later

b)

Only Heat

c)

Power First and Heat Later

d)

Only Power

43.

The efficiency of which of the following turbine systems is the highest

a)

condensing

b)

back pressure

c)

double extraction condensing

d)

extraction condensing

44.

A waste heat recovery steam generator is used with

a)

steam turbines

b)

back pressure turbines

c)

gas turbines

d)

condensing turbines

45.

Combined cycle is a combination of

a)

conventional boiler first followed by cogeneration system

b)

Brayton cycle first followed by a standard Rankine cycle

c)

Rankine cycle first followed by a Brayton cycle

d)

extraction in the first portion and then a condensing cycle

46.

Power is to be generated from a cement kiln exhaust gas. The applicable type of cogeneration is called

a)

topping cycle

b)

Carnot cycle

c)

bottoming cycle

d)

Brayton cycle

47.

The Brayton cycle is a characteristic of

a)

steam turbine

b)

petrol engine

c)

gas turbine

d)

none of the above

48.

Recuperator as a waste heat recovery system is used mainly in a

a)

boiler

b)

reheating furnace

c)

compressor

d)

gas turbine

49.

The device used for recovering waste heat from the textile drier exhaust

a)

heat wheel

b)

recuperator

c)

economizer

d)

regenerator

50.

In the context of cogeneration turbine, the thermodynamic process taking place is

a)

expansion

b)

condensation

c)

contraction

d)

both (a) & (c)

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