Question bank for Energy Managers & Energy Auditors 

 

Chapter 1.4 Material and Energy Balance 

 
Part – I: 

Objective type questions and answers 

 

 

1. 

The objective of material and energy balance is to assess the: 

a) input-output   

b) conversion efficiency  

c) losses 

 

d) all the above   

e) none of the above 

2. 

In the material balance of a process or unit operation process, which component will not be 
considered on the input side?  

a) Chemicals 

b) Water/air 

 

c) Recycle 

d) By product

3. 

In material balance of a process, recycle product is always considered as    

a) input to process 

b) output to process 

c) both (a) and (b) 

d) none of them 

4. 

Losses in material and energy balance is considered as 

a) inputs 

b) outputs 

 

c) both (a) and (b) 

d) none of the above 

5. 

Sankey diagram shows in graphics ___.  

a) energy input   

b) energy output 

c) energy balance 

d) all the above

6. 

In a chemical process of two reactants A (200 kg) and B (200kg) is used as reactants. If 

conversion is 50% and A and B reacts in equal proportion then calculate the weight of the 
product formed. 

a) 150 kg 

b) 200 kg 

 

c) 250 kg 

d) 400 kg 

7. 

In a furnace, the lower the exhaust temperature ____ is the furnace efficiency.  

a) lower  

b) moderate 

 

c) higher 

 

d) none of above 

8. 

Which of the following is the  predominant loss in a furnace oil fired boiler?  

a) dry flue gas losses  

 

 

 

b) heat loss due to moisture in air 

c) heat loss due to radiation and convection 

d) heat loss due to moisture in fuel 

9. 

In a heat treatment furnace the material is heated up to  800 °C from ambient temperature of 
30 ° C considering the specific heat of material as 0.13 kCal / kg °C. What is the energy 

content

 

in one kg of  material after heating? 

a)  150 kCal 

 

b) 250 kCal 

 

c) 350 kCal 

 

4) 100 kCal

10. 

If feed of 100 tonnes per hour at 5% concentration is fed to a crystallizer, the product obtained 
at 25% concentration is equal to ____ tonnes per hour.  

a) 20 

 b) 

25 

 c) 

35 

 d) 

40 

11. 

In an utility steam boiler, heat loss due to radiation normally is  in the range of  

a) 10%   

b) 14%   

c) 1%  

d) 

8% 

1.4 Material and Energy Balance

 

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