McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
Equivalent evaporation of water is the evaporation "for a feed water supply at 100°C |
| A. | and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2 |
| B. | and its corresponding conversion into dry steam at desired boiler pressure |
| C. | conversion into steam at atmospheric condition |
| D. | conversion into steam at the same pres-sure at which feed water is supplied |
| Answer» A. and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2 | |
| 2. |
Cochran boiler is a |
| A. | horizontal fire-tube boiler |
| B. | horizontal water-tube boiler |
| C. | veritcal water-tube boiler |
| D. | vertical fire tube boiler |
| Answer» D. vertical fire tube boiler | |
| 3. |
Lancashire 'boiler is a |
| A. | stationary fire tube boiler |
| B. | stationary water tube boiler |
| C. | water tube boiler with natural/forced circulation |
| D. | mobile fire tube boiler |
| Answer» A. stationary fire tube boiler | |
| 4. |
The diameter of Cornish boiler is of the order of |
| A. | 1-2 m |
| B. | 1.5-2.5 m |
| C. | 2-3 m |
| D. | 2.5-3.5 m |
| Answer» A. 1-2 m | |
| 5. |
The lenght of Cornish boiler is of the order of |
| A. | 2-4 m |
| B. | 3-5 m |
| C. | 5-7.5 m |
| D. | 7-9 m |
| Answer» C. 5-7.5 m | |
| 6. |
The diameter of fire tube of Cornish boiler compared to its shell is |
| A. | one half |
| B. | one third |
| C. | one-fifth |
| D. | two-fifth |
| Answer» A. one half | |
| 7. |
Water tube boilers are those in which |
| A. | flue gases pass through tubes and water around it |
| B. | water passes through the tubes and flue gases around it |
| C. | work is done during adiabatic expansion |
| D. | change in enthalpy |
| Answer» C. work is done during adiabatic expansion | |
| 8. |
Lancashire boiler is of |
| A. | stationary fire tube-type |
| B. | horizontal type |
| C. | internally fired type |
| D. | all of the above. |
| Answer» D. all of the above. | |
| 9. |
Fire tube boilers are those in which |
| A. | flue gases pass through tubes and water around it |
| B. | water passes through the tubes and flue gases around it |
| C. | forced circulation takes place |
| D. | tubes are laid vertically |
| Answer» A. flue gases pass through tubes and water around it | |
| 10. |
The number of flue tubes in Lancashire boiler is |
| A. | zero |
| B. | one |
| C. | two |
| D. | four |
| Answer» C. two | |
| 11. |
Which of the following is a water tube boiler |
| A. | Lancashire boiler |
| B. | Cochran boiler |
| C. | Cornish boiler |
| D. | Babcock and Wilcox boiler |
| Answer» D. Babcock and Wilcox boiler | |
| 12. |
The diameter of cylindrical shell of the Lancashire boiler is of the order of |
| A. | 1 to 1.25m |
| B. | 1 to 1.75 m |
| C. | 2 to 4 m |
| D. | 1.75 to 2.75 m |
| Answer» D. 1.75 to 2.75 m | |
| 13. |
A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are |
| A. | supplied by same manufacturer loose and assembled at site |
| B. | supplied mounted on a single base |
| C. | purchased from several parties and packed together at site |
| D. | packaged boiler does not exist |
| Answer» B. supplied mounted on a single base | |
| 14. |
The diameter of internal flue tubes in a Lancashire boiler compared to its shell is |
| A. | one-half |
| B. | one-third |
| C. | one-fourth |
| D. | two-fifth. |
| Answer» D. two-fifth. | |
| 15. |
The water tubes in a babcock and wilcox boiler are |
| A. | horizontal |
| B. | vertical |
| C. | inclined |
| D. | horizontal and inclined |
| Answer» C. inclined | |
| 16. |
A boiler in India should conform to safety regulations of |
| A. | DIN |
| B. | BS |
| C. | ASTM |
| D. | IBR |
| Answer» D. IBR | |
| 17. |
The difference between cornish boiler and lancashire boiler is that |
| A. | former is fire tube type and latter is water tube type boiler |
| B. | former is water tube type and latter is fire tube type |
| C. | former contains one fire tube and latter contains two fire tubes |
| D. | former contains two fire tubes and latter contains one fire tube |
| Answer» C. former contains one fire tube and latter contains two fire tubes | |
| 18. |
A fusible plug is fitted in small boilers in order to |
| A. | avoid excessive build up of pressure |
| B. | avoid explosion |
| C. | extinguish fire if water level in the boiler falls below alarming limit |
| D. | control steam dome |
| Answer» C. extinguish fire if water level in the boiler falls below alarming limit | |
| 19. |
The fusible plug in small boilers is located |
| A. | in the drum |
| B. | in the fire tubes |
| C. | above steam dome |
| D. | over the combustion chamber |
| Answer» D. over the combustion chamber | |
| 20. |
Fusible plug for boilers is made of fusible metal containing tin, lead, and |
| A. | bismuth |
| B. | copper |
| C. | aluminium |
| D. | nickel |
| Answer» A. bismuth | |
| 21. |
The ratio of heat utilised to produce steam and the heat liberated in furnace is known as |
| A. | boiler effectiveness |
| B. | boiler evaporative capacity |
| C. | factor of evaporation |
| D. | boiler efficiency. |
| Answer» D. boiler efficiency. | |
| 22. |
It is required to produce large amount of steam at low pressure. Which boiler should be used ? |
| A. | pulverised fuel fired boiler |
| B. | cochran boiler |
| C. | lancashire boiler |
| D. | babcock and wilcox boiler |
| Answer» C. lancashire boiler | |
| 23. |
Size of boiler tubes is specified by |
| A. | mean diameter and thickness |
| B. | inside diameter and thickness |
| C. | outside diameter and thickness |
| D. | outside diameter and inside diameter |
| Answer» C. outside diameter and thickness | |
| 24. |
The heat loss in a boiler takes place in the form of |
| A. | heat carried away by flue gases |
| B. | heat carried away by ash |
| C. | radiation |
| D. | all of the above. |
| Answer» D. all of the above. | |
| 25. |
The diameter of fire tubes in Cochran boiler is of the order of |
| A. | 2 cm |
| B. | 6 Cm |
| C. | 8 cm |
| D. | 12 cm |
| Answer» B. 6 Cm | |
| 26. |
In a recuperative air preheater, the heat is transferred |
| A. | from a metal wall from one medium to another |
| B. | from heating an itermediate material and then heating the air from this material |
| C. | by direct mixing , |
| D. | heat is tr |
| Answer» D. heat is tr | |
| 27. |
The function of injector used in small capacity boilers is to |
| A. | create vacuum |
| B. | inject chemical solution in feed pump |
| C. | pump water, similar to boiler feed pump |
| D. | add make up water in the system |
| Answer» C. pump water, similar to boiler feed pump | |
| 28. |
The maximum discharge through a chimney occurs when the height of chimney is |
| A. | infinitely long |
| B. | around 200 meters |
| C. | equal to the height of the hot gas column producing draught |
| D. | outside temperature is very low |
| Answer» C. equal to the height of the hot gas column producing draught | |
| 29. |
The economiser is used in boilers to |
| A. | increase thermal efficiency of boiler |
| B. | economise on fuel |
| C. | extract heat from the exhaust flue gases |
| D. | increase flue gas temperature |
| Answer» A. increase thermal efficiency of boiler | |
| 30. |
An economiser in a boiler |
| A. | increases steam pressure |
| B. | increases steam flow |
| C. | decreases fuel consumption |
| D. | decreases steam pressure |
| Answer» C. decreases fuel consumption | |
| 31. |
The safety valve on boiler drum compared to safety valve on superheater is set at |
| A. | same value |
| B. | higher value |
| C. | lower value |
| D. | lower/higher depending on steam flow |
| Answer» B. higher value | |
| 32. |
The capacity of induced draft fan compared to forced draft fan in a boiler is |
| A. | same |
| B. | more |
| C. | less |
| D. | less or more depending on size of boiler |
| Answer» B. more | |
| 33. |
Evaporative capacity of boiler is expressed as |
| A. | kg of steam produced |
| B. | steam pressure produced |
| C. | kg of fuel fired |
| D. | kg of steam produced per kg of fuel fired |
| Answer» D. kg of steam produced per kg of fuel fired | |
| 34. |
The condition of steam in boiler drum is always |
| A. | dry |
| B. | wet |
| C. | saturated |
| D. | superheated. |
| Answer» B. wet | |
| 35. |
The balanced draft furnace is one using |
| A. | induced draft fan and chimney |
| B. | induced draft fan and forced draft fan |
| C. | forced draft fan and chimney |
| D. | any one of the above |
| Answer» B. induced draft fan and forced draft fan | |
| 36. |
Fire tube boilers are limited to a maximum design working pressure of |
| A. | 1 kg/cm |
| B. | 6 kg/cm |
| C. | 17 kg/cm2 |
| D. | 100 kg/cm2 |
| Answer» C. 17 kg/cm2 | |
| 37. |
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has |
| A. | more heating surface |
| B. | less heating surface |
| C. | equal heating surface |
| D. | heating surface depends on other parameters |
| Answer» A. more heating surface | |
| 38. |
The feed check valve is used in order to |
| A. | regulate flow of boiler water |
| B. | check level of water in boiler drum |
| C. | recirculate unwanted feed water |
| D. | allow high pressure feed water to flow to drum and not allow reverse flow to take place |
| Answer» D. allow high pressure feed water to flow to drum and not allow reverse flow to take place | |
| 39. |
Equivalent evaporation is the amount of water evaporated in a boiler from and at |
| A. | 0°C |
| B. | 100°C |
| C. | saturation temperature at given pressure |
| D. | room temperature |
| Answer» B. 100°C | |
| 40. |
The equivalent evaporation of a boiler is a measure to compare |
| A. | the given boiler with the model |
| B. | the two different boilers of the same make |
| C. | two different makes of boilers operat¬ing under the same operating conditions |
| D. | any type of boilers operating under any conditions. |
| Answer» D. any type of boilers operating under any conditions. | |
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