Assingment-2
1.The energy stored in the bonds of atoms and molecules is called
a) Kinetic energy b) Chemical energy
c) Potential energy d) Magnetic energy
2.Active power consumption of motive drives AC 3 phase can be determined by using one of the following relations.
a) √3 x V x I b) √3 x V2 x I x cosϕ
c) √3 x V x I2 x Cosϕ d) √3 x V x I x Cosϕ
3.The grade of energy can be classified as low, high, extra ordinary. In case of electrical energy it would fall under ____ category. (EM/EA)
a) low grade b) extra ordinary grade c) high grade d) none of the above
4.The energy consumed by a 50 kW motor loaded at 40 kW over a period of 4 hours is
a. 50 kWh b) 160 kWh c) 40 kWh d) 2000 kWh
5.The quantity of heat required to raise the temperature of 1 gram of water by 1 OC is termed as
a) Specific heat b) Heat capacity c) One Calorie d) Sensible heat
6.Nameplate kW or HP rating of a motor indicates
a) input kW to the motor b) output kW of the motor
c) minimum input kW to the motor d) maximum input kW to the motor
7.The quantity of heat required to change 1 kg of the substance from liquid to vapor state without change of temperature is termed as
a) Latent heat of fusion b) Latent heat of vaporization
c) Heat capacity d) Sensible heat
8.The specific heat of ____ is very high compared to other common substances listed below.
a) Lead b) Mercury c) Water d) Alcohol
9.The method of producing power by utilizing steam generated for process in the boiler is termed as -----
a) Extraction b) Cogeneration c) Both a & b d) Neither a nor b
10.“The judicious and effective use of energy to maximise profits and enhance competitive positions”. This can be the definition of:
a) Energy conservation b) Energy management
c) Energy policy d) Energy Audit
11.The objective of energy management includes
a) Minimising energy costs b) minimising waste
c) Minimising environmental degradation d) all the above
12.Replacement of steam based hot water generation by solar system is an example of
a) matching energy usage to the requirement
b) maximising system efficiency
c) Energy substitution
d) Performance improvement
13.One unit of electricity is equivalent to ___ kcal heat units.
a) 800 b) 860 c) 400 d) 680
14.Which instrument is used to monitor O2, CO in flue gas?
a) Combustion analyzer b) Power analyzer
c) Pyrometer d) Fyrite
15.Lux meter is used to measure…… (EA)
a) Illumination level b) Sound intensity and illumination level
c) Harmonics d) Speed
16.Energy manger should be well versed with
a) Manufacturing and processing skills b) Managerial and technical skills
c) Technical and marketing skills d) Managerial and commercial skills
17.An energy policy does not include
a) Target energy consumption reduction
b) Time period for reduction
c) Declaration of top management commitment
d) Future production projection
18.Non contact speed measurements can be carried out by
a) Tachometer b) Stroboscope
c) Oscilloscope d) Speedometer
19.The tool used for performance assessment and logical evaluation of avenues for improvement in Energy management and audit is
a) Fuel substitution b) Monitoring and verification
c) Energy pricing d) Bench marking
20.The various types of the instruments, which requires during audit need to be
a) easy to carry b) easy to operate
c) inexpensive d) all (a) to (c)
21.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
22.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
23.Losses in material and energy balance is considered as
a) inputs b) outputs c) both (a) and (b) d) none of the above
24.In a furnace, the lower the exhaust temperature ____ is the furnace efficiency.
a) lower b) moderate c) higher d) none of above
25.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 d) 100 kCal
26.In an utility steam boiler, heat loss due to radiation normally is in the range of
a) 10% b) 14% c) 1% d) 8%
27.Material and energy balance will identify areas to concentrate for energy conservation.
True or False
28.Energy supplied by electricity, Q in kCal is equal to _____ .
a) kWh x 8.6 b) kWh x 86 c) kWh x 860 d) none
29.In material and energy balance, cycle time play an important role.
True or False
30. Sankey diagram is an useful tool to represent ____.
a) financial strength of the company b) management philosophy
c) input and output energy flow d) human resource strength of the company
Subjective Questions
1.Define the terms ‘temperature’ and ‘pressure’
2.Differentiate the terms ‘specific heat’ and ‘heat capacity’?
3.What is ‘Reactive power’ and ‘Active power’?
4.What do you mean by energy audit?
5. List any one energy audit instrument used for power measurement and one for flue gas measurement along with parameters to be measured?
6.Define specific power consumption with an example.
7.How material and energy balance helps in energy conservation?
8.Differentiate exothermic and endothermic reactions.
Answer Key
1. B
2. D
3. C
4. B
5. C
6. B
7. B
8. C
9. B
10. B
11. D
12. C
13. B
14. A
15. A
16. B
17. D
18. B
19. D
20. D
21. D
22. D
23. B
24. C
25. D
26. C
27. True
28. C
29. True
30. C
Subjective Question
1. Temperature and pressure are measures of the physical state of a substance. They are closely related to the energy contained in the substance. As a result, measurements of temperature and pressure provide a means of determining energy content.
Temperature
It is the degree of hotness or coldness measured on a definite scale. Heat is a form of energy; temperature, a measurement of its thermal effects. In other words, temperature is a means of determining sensible heat content of the substance
Pressure
It is the force per unit area applied to outside of a body. When we heat a gas in a confined
2. Specific heat is defined as the quantity of heat required to raise the temperature of 1 kg of a substance through 1 OC. Heat capacity is defined as the quantity of heat required to raise the temperature of the object by 1 OC.
3. Reactive power (kVAr) is the portion of the apparent power that does no work. This type of power must be supplied to all types of magnetizing equipment, such as motors, transformers etc. larger the magnetizing requirement, larger the kVAr. Active power is the work producing part of the apparent power.
4. Energy Audit is defined as “the verification, monitoring and analysis of use of energy including submission of technical report containing recommendations for improving energy efficiency with cost benefit analysis and an action plan to reduce energy consumption”.
5.
6. The specific energy consumption is defined as the energy required to produce a unit of output.
e.g. : Compressors:
A compressor generates 100 cfm of air at 7 kg/cm2 pressure. The power drawn by the motor is 18 kW.
i.e. Specific energy consumption is = 18/100
=0.18kW/cfm@7kg/cm2
7. In material and energy balance study by assessing the input, conversion efficiency, output and losses helps in establishing the basis for improvements and potential savings. It helps in finding improvements in a prioritised manner.
8. Exothermic reaction: A chemical reaction in which Heat is released.
Endothermic reaction: A chemical reaction in which heat is absorbed.