MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The draught produced by a steam jet issuing from a nozzle placed in the chimney is called |
| A. | chimney draught |
| B. | forced steam jet draught |
| C. | none of these |
| D. | induced steam jet draught |
| Answer» E. | |
| 2. |
The relative efficiency is defined as the |
| A. | ratio of brake power to the indicated power |
| B. | ratio of thermal efficiency to Rankine efficiency |
| C. | product of thermal efficiency and Rankine efficiency |
| D. | ratio of heat equivalent to indicated power to the energy supplied in steam |
| Answer» C. product of thermal efficiency and Rankine efficiency | |
| 3. |
The actual power supplied by the engine crankshaft is called |
| A. | brake power |
| B. | none of these |
| C. | indicated power |
| D. | frictional power |
| Answer» B. none of these | |
| 4. |
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as |
| A. | superheater |
| B. | air preheater |
| C. | economiser |
| D. | injector |
| Answer» C. economiser | |
| 5. |
The chimney draught varies with |
| A. | all of these |
| B. | climatic conditions |
| C. | temperature of furnace gases |
| D. | height of chimney |
| Answer» B. climatic conditions | |
| 6. |
Which of the following is a water tube boiler ? |
| A. | Cochran boiler |
| B. | Locomotive boiler |
| C. | Babcock and Wilcox boiler |
| D. | Lancashire boiler |
| Answer» D. Lancashire boiler | |
| 7. |
The missing quantity per stroke is equal to |
| A. | cylinder feed - indicated mass of steam |
| B. | cylinder feed + indicated mass of steam |
| C. | mass of cushion steam + indicated mass of steam |
| D. | mass of cushion steam + cylinder feed |
| Answer» B. cylinder feed + indicated mass of steam | |
| 8. |
A compound steam engine in which piston rods of high pressure and low pressure cylinders � are attached to two different cranks set at 180° to each other, is called |
| A. | None of these |
| B. | Tandem type compound engine |
| C. | Woolf type compound engine |
| D. | receiver type compound engine |
| Answer» D. receiver type compound engine | |
| 9. |
Lancashire boiler is |
| A. | internally fired boiler |
| B. | stationary fire tube boiler |
| C. | horizontal boiler |
| D. | all of these |
| Answer» E. | |
| 10. |
The equivalent evaporation is defined as |
| A. | the amount of water evaporated or steam produced in kg per kg of fuel burnt |
| B. | the ratio of heat actually used in producing the steam to the heat liberated in the furnace |
| C. | the evaporation of 15.653 kg of water per hour from and at 100° C |
| D. | the amount of water evaporated from and at 100° C into dry and saturated steam |
| Answer» E. | |
| 11. |
Expansion ratio is the ratio of |
| A. | swept volume to the volume at cut-off |
| B. | volume at cut-off to the swept volume |
| C. | swept volume to the clearance volume |
| D. | clearance volume to the swept volume |
| Answer» B. volume at cut-off to the swept volume | |
| 12. |
The high pressure and low pressure cylinders in a Tandem type compound engine are regarded as having cranks |
| A. | 0° to each other |
| B. | 180° to each other |
| C. | none of these |
| D. | 90° to each other |
| Answer» B. 180° to each other | |
| 13. |
The fire tubes in a Cochran boiler usually have __________ diameter. |
| A. | 6.25 mm |
| B. | 62.5 mm |
| C. | 92.5 mm |
| D. | 72.5 mm |
| Answer» C. 92.5 mm | |
| 14. |
The selection of type and size of a steam boiler depends upon |
| A. | all of the above |
| B. | the fuel and water available |
| C. | the power required and working pressure |
| D. | the geographical position of the power house |
| Answer» B. the fuel and water available | |
| 15. |
The artificial draught is produced by |
| A. | centrifugal fan |
| B. | steam jet |
| C. | both steam jet and centrifugal fan |
| D. | chimney |
| Answer» D. chimney | |
| 16. |
Lancashire boiler is used where working pressure and power required are |
| A. | low |
| B. | high |
| C. | moderate |
| D. | none of these |
| Answer» D. none of these | |
| 17. |
The momentum correction factor (?) for the viscous flow through a circular pipe is |
| A. | 1.5 |
| B. | 1.33 |
| C. | 1.25 |
| D. | 2 |
| Answer» C. 1.25 | |