MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Energy Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a furnace employing forced draught compared to induced draught __________ |
| A. | the fan operates hot and hence blades are liable to corrosion and erosion |
| B. | positive pressure exists in the furnace |
| C. | air is sucked in, so air leaks are more and hence furnace efficiency is reduced |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 2. |
Natural draught produced by a chimney depends upon __________ |
| A. | density of chimney gases |
| B. | height of chimney |
| C. | both ‘density of chimney gases’ and ‘height of chimney’ |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 3. |
Stack heat losses can be minimised by __________ |
| A. | using low c.v. fuels |
| B. | controlling the excess air |
| C. | oxygen enrichment of combustion air |
| D. | maintaining proper draft in the furnace |
| Answer» C. oxygen enrichment of combustion air | |
| 4. |
The draught or pressure difference for a chimney of height of H metres is given by?a) Δp = gH(ρa-ρg)b) Δp = gH(ρg-ρ |
| A. | Δp = gH(ρa-ρg) |
| B. | Δp = gH(ρg-ρa) |
| C. | Δp = gHρg |
| D. | Δp = gH(ρa+ρg) |
| Answer» B. Δp = gH(ρg-ρa) | |
| 5. |
WHICH_IS_MOST_PREFERRED_TYPE_OF_DRAUGHT_SYSTEM??$ |
| A. | Chimney draught |
| B. | Fan draught |
| C. | Force draught |
| D. | Balanced draught |
| Answer» E. | |
| 6. |
HOW_CAN_EXHAUST_GAS_BE_RECOVERED_IN_THE_INDUCED_DRAUGHT??$ |
| A. | By installing the forced draught fan at the starting point |
| B. | By extending the chimney’s height |
| C. | By inletting high amount of air from multiple air ducts |
| D. | By installing air preheater and economizer along the gas path |
| Answer» E. | |
| 7. |
Which type of draught system is used in the locomotives?$ |
| A. | Natural draught system |
| B. | Balanced draught system |
| C. | Forced draught system |
| D. | Induced Steam draught system |
| Answer» E. | |
| 8. |
How pressure in the furnace is maintained below atmospheric pressure in balanced draught system?$ |
| A. | By forced draught fan |
| B. | By induced fan |
| C. | Depends on the height of chimney |
| D. | By installing Natural draught |
| Answer» C. Depends on the height of chimney | |
| 9. |
Which draught system is used as conjunction with chimney draught? |
| A. | Forced steam draught |
| B. | Forced draught |
| C. | Induced draught |
| D. | Balanced draught |
| Answer» B. Forced draught | |
| 10. |
Which draught system is also known as turbine draught? |
| A. | Forced steam draught |
| B. | Induced steam draught |
| C. | Natural draught |
| D. | Fan draught |
| Answer» B. Induced steam draught | |
| 11. |
Where is blower installed in induced draught system? |
| A. | Near the boiler |
| B. | Base of the chimney |
| C. | Above the boiler |
| D. | Between economizer and air preheater |
| Answer» C. Above the boiler | |
| 12. |
What is installed to transfer air into furnace in forced draught system? |
| A. | Air blower |
| B. | Tuyeres |
| C. | Draft gauges |
| D. | Cyclone separator |
| Answer» B. Tuyeres | |
| 13. |
Artificial draught is also called as _______ |
| A. | Force draught |
| B. | Induced draught |
| C. | Balanced draught |
| D. | Mechanical draught |
| Answer» E. | |
| 14. |
When is artificial draught preferred? |
| A. | When quick evacuation of flue gases is required |
| B. | When we choose large power plant systems |
| C. | When draught produced by chimney is not sufficient |
| D. | When there are many components inside the boiler |
| Answer» D. When there are many components inside the boiler | |
| 15. |
Which of the following given below as the affect on amount natural draught? |
| A. | Boiler operation |
| B. | Size of the furnace |
| C. | Grade of the fuel |
| D. | Dust content in the fuel is used |
| Answer» B. Size of the furnace | |
| 16. |
By what is natural draught produced? |
| A. | Air duct |
| B. | Chimney |
| C. | Locomotive exhaust |
| D. | Air blower |
| Answer» C. Locomotive exhaust | |
| 17. |
Which is the correct formula of total draught loss? |
| A. | H<sub>t</sub> = H<sub>v</sub> + H<sub>b</sub> + H<sub>c</sub> + H<sub>cd</sub> |
| B. | H<sub>t</sub> = H<sub>v</sub> + H<sub>b</sub> – H<sub>c</sub> + H<sub>cd</sub> |
| C. | H<sub>t</sub> = H<sub>v</sub> – H<sub>b</sub> + H<sub>c</sub> + H<sub>cd</sub> |
| D. | H<sub>t</sub> = H<sub>v</sub> – H<sub>b</sub> – H<sub>c</sub> – H<sub>cd</sub> |
| Answer» B. H<sub>t</sub> = H<sub>v</sub> + H<sub>b</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® H<sub>c</sub> + H<sub>cd</sub> | |
| 18. |
Why boiler draught is most essential part of the thermal plants? |
| A. | Serves combustion by supplying ample amount of air |
| B. | Helps in maintaining air ventilation |
| C. | Required to maintain constant air flow |
| D. | Stabilizes the boiler system |
| Answer» D. Stabilizes the boiler system | |