McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
For water, at pressures below atmospheric, |
| A. | melting point rises slightly and boiling point drops markedly |
| B. | melting point rises markedly and boiling point drops markedly |
| C. | melting point drops slightly and boiling point drops markedly |
| D. | melting point drops slightly and boiling point drops slightly |
| Answer» A. melting point rises slightly and boiling point drops markedly | |
| 2. |
At very low temperature, the melting and boiling temperatures become equal. This temperature is |
| A. | 373°K |
| B. | 273.16°K |
| C. | 303°K |
| D. | 0°K. |
| Answer» B. 273.16°K | |
| 3. |
The critical pressure at which latent heat of vaporisation is zero is |
| A. | 225.65 kgf/cm2 |
| B. | 273 kgf/cm2 |
| C. | 100 kgf/cm2 |
| D. | 1 kgf/cm2 |
| Answer» A. 225.65 kgf/cm2 | |
| 4. |
The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is |
| A. | less |
| B. | more |
| C. | equal |
| D. | may be less or more depending on temperature |
| Answer» A. less | |
| 5. |
The saturation temperature of steam with increase in pressure increases |
| A. | linearly |
| B. | rapidly first and then slowly |
| C. | slowly first and then rapidly |
| D. | inversely |
| Answer» B. rapidly first and then slowly | |
| 6. |
Heating of dry steam above saturation temperature is known as |
| A. | enthalpy |
| B. | superheating |
| C. | supersaturation |
| D. | latent heat |
| Answer» B. superheating | |
| 7. |
Superheating of steam is done at |
| A. | constant volume |
| B. | constant temperature |
| C. | constant pressure |
| D. | constant entropy |
| Answer» C. constant pressure | |
| 8. |
Sublimation region is the region where |
| A. | solid and vapour phases are in equi-librium |
| B. | solid and liquid phases are in equilibrium |
| C. | liquid and vapour phases are in equilibrium |
| D. | solid, liquid and vapour phases are in equilibrium |
| Answer» A. solid and vapour phases are in equi-librium | |
| 9. |
One kg of steam sample contains 0.8 kg dry steam; it's dryness fraction is |
| A. | 0.2 |
| B. | 0.8 |
| C. | 1.0 |
| D. | 0.6 |
| Answer» B. 0.8 | |
| 10. |
If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by |
| A. | throttling calorimeter |
| B. | separating calorimeter |
| C. | combined separating and throttling calorimeter |
| D. | bucket calorimeter |
| Answer» A. throttling calorimeter | |
| 11. |
On Mollier chart, flow through turbine is represented by |
| A. | horizontal straight line |
| B. | vertical straight line |
| C. | straight inclined line |
| D. | curved line |
| Answer» B. vertical straight line | |
| 12. |
A wet vapour can be completely specified by |
| A. | pressure only |
| B. | temperature only |
| C. | dryness fraction only |
| D. | pressure and dryness fraction. |
| Answer» D. pressure and dryness fraction. | |
| 13. |
On Millier chart, the constant pressure lines |
| A. | diverge from left to right |
| B. | diverge from right to left |
| C. | are equally spaced throughout |
| D. | first rise up and then fall |
| Answer» A. diverge from left to right | |
| 14. |
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by |
| A. | horizontal straight line |
| B. | vertical straight line |
| C. | straight inclined line |
| D. | curved line |
| Answer» A. horizontal straight line | |
| 15. |
The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become |
| A. | wet |
| B. | superheated |
| C. | remain dry satruated |
| D. | dry |
| Answer» B. superheated | |
| 16. |
The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become |
| A. | wet |
| B. | superheated |
| C. | remain dry saturated |
| D. | dry |
| Answer» A. wet | |
| 17. |
In a throttling process |
| A. | steam temperature remains constant |
| B. | steam pressure remains constant |
| C. | steam enthalpy remains constant |
| D. | steam entropy remains constant |
| Answer» C. steam enthalpy remains constant | |
| 18. |
In a throttling process |
| A. | heat transfer takes place |
| B. | work is done by the expanding steam |
| C. | internal energy of steam changes |
| D. | none of the above. |
| Answer» D. none of the above. | |
| 19. |
The latent heat of steam with increase of pressure |
| A. | remains same |
| B. | increases |
| C. | decreases |
| D. | behaves unpredictably |
| Answer» C. decreases | |
| 20. |
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 minutes and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is |
| A. | 40% |
| B. | 25% |
| C. | 50% |
| D. | 80% |
| Answer» D. 80% | |
| 21. |
Heating wet steam at constant temperature is heating it at constant |
| A. | volume |
| B. | pressure |
| C. | entropy |
| D. | enthalpy |
| Answer» B. pressure | |
| 22. |
The state of vapour under saturation condition is described by |
| A. | pressure alone |
| B. | temperature alone |
| C. | pressure and temperature |
| D. | pressure and dryness fraction |
| Answer» D. pressure and dryness fraction | |
| 23. |
The increase in pressure |
| A. | lowers the boiling point of a liquid |
| B. | raises the boiling point of a liquid |
| C. | .does not affect the boiling point of a liquid |
| D. | reduces its volume |
| Answer» B. raises the boiling point of a liquid | |
| 24. |
What is a pure substance? |
| A. | homogeneous mixture of two substances of same composition |
| B. | a substance with constant chemical composition throughout its mass |
| C. | both a. and b. |
| D. | none of the above |
| Answer» B. a substance with constant chemical composition throughout its mass | |
| 25. |
A pure substance exists in |
| A. | solid phase |
| B. | liquid phase |
| C. | gaseous phase |
| D. | all of the above |
| Answer» D. all of the above | |
| 26. |
Total heat of a substance is also known as |
| A. | internal energy |
| B. | entropy |
| C. | thermal capacity |
| D. | enthalpy |
| Answer» D. enthalpy | |
| 27. |
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 | |
| 28. |
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 | |
| 29. |
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 | |
| 30. |
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 | |
| 31. |
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 | |
| 32. |
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 | |
| 33. |
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 | |
| 34. |
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. | |
| 35. |
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 | |
| 36. |
The number of flue tubes in Lancashire boiler is |
| A. | zero |
| B. | one |
| C. | two |
| D. | four |
| Answer» C. two | |
| 37. |
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 | |
| 38. |
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 | |
| 39. |
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 | |
| 40. |
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. | |
| 41. |
The water tubes in a babcock and wilcox boiler are |
| A. | horizontal |
| B. | vertical |
| C. | inclined |
| D. | horizontal and inclined |
| Answer» C. inclined | |
| 42. |
A boiler in India should conform to safety regulations of |
| A. | DIN |
| B. | BS |
| C. | ASTM |
| D. | IBR |
| Answer» D. IBR | |
| 43. |
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 | |
| 44. |
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 | |
| 45. |
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 | |
| 46. |
Fusible plug for boilers is made of fusible metal containing tin, lead, and |
| A. | bismuth |
| B. | copper |
| C. | aluminium |
| D. | nickel |
| Answer» A. bismuth | |
| 47. |
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. | |
| 48. |
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 | |
| 49. |
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 | |
| 50. |
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. | |
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