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Total Questions: 18
1. A sample of coal containing the following elements: C=90%; H=5%; ash=4%; weight of the coal burnt=0.90g; weight of the water taken=600g; water equivalent of bomb calorimeter=2000g; rise in temperature=2.48oC; fuse wire correction=10cal; cooling correction=0.02oC; acid correction=50 cal. Calculate net and GCV of coal in cal/g. Assume latent heat of steam is 580cal/g.
Correct Answer is : HCV=7155.55cal/g; NCV=6894.55cal/g
2. Calculate the weight and volume of air required for the complete combustion of 2kg of carbon.
Correct Answer is : weight of air=5330g;volume of the air=17766.66l
3. The coal sample contains=80%;H=4%;O=2%;N=12%;S=2%, the remainder is ash and then calculate the volume of air required for perfect combustion of 1kg of fuel assuming STP conditions.
Correct Answer is : weight of oxygen required=10.65kg;volume of the oxygen=8166.6l
4. CO=40%, H2=12%, CO2=6%, CH2=2%, N2=50% are the components in the coal. What will be the composition of the dry flue gas, if the 50% excess air was used for burning 100m3 of gas?
Correct Answer is : CO2=14.9%,N2=79.9%,O2=5.2%
5. Which of the following releases less amount of carbon dioxide per unit of energy?
Correct Answer is : Oil
6. Which of the following is not the constitute of CNG?
Correct Answer is : isobutane
7. In standard hydrogen electrode, concentration of hydrogen is____________
Correct Answer is : 1M
8. The temperature maintained in the standard hydrogen electrode is _____________
Correct Answer is : 25oC
9. The emf of the standard hydrogen electrode is ____________
Correct Answer is : 0V
10. Which of the following is the correct equation?
Correct Answer is : E = Eo – [(2.303RT)/nF] log10 [H+].
11. If the standard hydrogen electrode is used as the reduction electrode, then the emf is given by__________
Correct Answer is : Ered = -Eo + (0.0591/n ) log10 [H+].
12. In standard calomel electrode, for saturated KCL solution, electrode potential is__________
Correct Answer is : 0.2415V
13. For 1N KCL standard reduction potential in the calomel electrode is__________
Correct Answer is : 0.28V
14. The calomel electrode is only used as_________
Correct Answer is : Reducing electrode
15. ___________is the device used to measure the emf of the cell.
Correct Answer is : Potentiometer
16. The emf of the Weston standard cell is __________ at 20oC.
Correct Answer is : 1.0183V
17. In primary cells reaction is not reversible.
Correct Answer is : TRUE
18. The energy of the fuel cells ___________
Correct Answer is : Is stored
