MCQOPTIONS
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MCQOPTIONS
This section includes 760 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
_Which of the following boilers is best suited to meet fluctuating demands?$? |
| A. | Babcock and Wilcox |
| B. | Locomotive |
| C. | Lancashire |
| D. | Cochran |
| Answer» C. Lancashire | |
| 552. |
_Which is not correct statement about the function of furnace?$? |
| A. | To provide proper conditions for continuous complete combustion |
| B. | Mix fuel with air and ignite |
| C. | Separate ash from coal |
| D. | Maintain heat supply to prepare and ignite the incoming fuel |
| Answer» D. Maintain heat supply to prepare and ignite the incoming fuel | |
| 553. |
_For water, at pressures below atmospheric;$? |
| A. | Melting point rises slightly and boiling point drops markedly |
| B. | Melting point rises markedly and boiling point drops markedly |
| C. | Melting point drops slightly and boiling point drops markedly |
| D. | Melting point drops slightly and boiling point drops slightly |
| Answer» B. Melting point rises markedly and boiling point drops markedly | |
| 554. |
_The flow of steam is supersonic$? |
| A. | At the entrance to the nozzle |
| B. | At the throat of the nozzle |
| C. | In the convergent portion of the nozzle |
| D. | In the divergent portion of the nozzle |
| Answer» E. | |
| 555. |
_There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called$? |
| A. | Wet steam |
| B. | Saturated steam |
| C. | Superheated steam |
| D. | Cushion steam |
| Answer» E. | |
| 556. |
_For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be$? |
| A. | One-half the height of chimney |
| B. | Equal to the height of chimney |
| C. | Two times the height of chimney |
| D. | Four times the height of chimney |
| Answer» C. Two times the height of chimney | |
| 557. |
_The function of a piston rod is$? |
| A. | To guide motion of the piston rod and to prevent it from bending |
| B. | To transfer motion from the piston to the cross head |
| C. | To convert heat energy of the steam into mechanical work |
| D. | To exhaust steam from the cylinder at proper moment |
| Answer» C. To convert heat energy of the steam into mechanical work | |
| 558. |
_The high steam and low water safety valve is used to blow off steam when the$? |
| A. | Steam pressure exceeds the working pressure |
| B. | Water level in the boiler becomes too low |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 559. |
_Which of the following is a fire tube boiler?$? |
| A. | Locomotive boiler |
| B. | Babcock and Wilcox boiler |
| C. | Stirling boiler |
| D. | All of the above |
| Answer» B. Babcock and Wilcox boiler | |
| 560. |
_The actual vacuum in a condenser is equal to$? |
| A. | Barometric pressure + actual pressure |
| B. | Barometric pressure - actual pressure |
| C. | Gauge pressure + atmospheric pressure |
| D. | Gauge pressure - atmospheric pressure |
| Answer» C. Gauge pressure + atmospheric pressure | |
| 561. |
_Pick up wrong statement about desired properties of a good fuel$? |
| A. | High calorific value |
| B. | Produce minimum smoke and gases |
| C. | Ease in storing |
| D. | High ignition point |
| Answer» E. | |
| 562. |
Fire tube boilers are limited to a maximum working pressure of$? |
| A. | 0.17 MN/m² |
| B. | 1.7 MN/m² |
| C. | 17 MN/m² |
| D. | 170 MN/m² |
| Answer» C. 17 MN/m¬¨‚⧠| |
| 563. |
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | First increases and then decreases |
| Answer» C. Remain unaffected | |
| 564. |
In a Woolf type compound engine, the high pressure and low pressure cylinders$? |
| A. | Have common piston rod |
| B. | Are set at 90° |
| C. | Have separate piston rod |
| D. | Are set in V arrangement |
| Answer» D. Are set in V arrangement | |
| 565. |
The increase in pressure$? |
| A. | Lowers the boiling point of a liquid |
| B. | Raises the boiling point of a liquid |
| C. | Does not affects the boiling point of a liquid |
| D. | Reduces its volume |
| Answer» C. Does not affects the boiling point of a liquid | |
| 566. |
The difference between Cornish boiler and Lancashire boiler is that$? |
| 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. | None of the above |
| Answer» D. None of the above | |
| 567. |
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases/decreases depending on steam temperature requirements |
| Answer» C. Remains unchanged | |
| 568. |
Which of the following boiler is best suited to meet the fluctuating demand of steam?$? |
| A. | Locomotive boiler |
| B. | Lancashire boiler |
| C. | Cornish boiler |
| D. | Babcock and Wilcox boiler |
| Answer» B. Lancashire boiler | |
| 569. |
The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.$? |
| A. | Equal to |
| B. | Less than |
| C. | Higher than |
| D. | None of these |
| Answer» C. Higher than | |
| 570. |
At which pressure the properties of water and steam become identical$? |
| A. | 0.1 kg/cm² |
| B. | 1 kg/cm² |
| C. | 100 kg/cm² |
| D. | 225.6 kg/cm² |
| Answer» E. | |
| 571. |
The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks$? |
| A. | 180° to each other |
| B. | 90° to each other |
| C. | 0° to each other |
| D. | None of these |
| Answer» B. 90¬¨‚àû to each other | |
| 572. |
1 kg.m is equal to$? |
| A. | 9.81 Joules |
| B. | 102 Joules |
| C. | 427 Joules |
| D. | None of these |
| Answer» B. 102 Joules | |
| 573. |
Stage efficiency is also known as$? |
| A. | Diagram efficiency |
| B. | Nozzle efficiency |
| C. | Gross efficiency |
| D. | None of these |
| Answer» D. None of these | |
| 574. |
The fittings mounted on the boiler for its proper and safe functioning is a$? |
| A. | Water level indicator |
| B. | Pressure gauge |
| C. | Safety valve |
| D. | All of these |
| Answer» E. | |
| 575. |
Steam in water tube boiler as compared to fire tube boiler$? |
| A. | Can be raised rapidly |
| B. | Is raised at slower rate |
| C. | Is raised at same rate |
| D. | Could be raised at fast/slow rate depending on design |
| Answer» B. Is raised at slower rate | |
| 576. |
In a boiler, the heat is lost$? |
| A. | To dry flue gases |
| B. | In moisture present in the fuel |
| C. | To steam formed by combustion of hydrogen per kg of fuel |
| D. | All of the above |
| Answer» E. | |
| 577. |
The best suited coal for chain or traveling grate stoker boiler is$? |
| A. | Coking coal |
| B. | Non-coking or free burning coal |
| C. | Pulverized coal |
| D. | High sulphur coal |
| Answer» C. Pulverized coal | |
| 578. |
The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.$? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | None of these |
| Answer» C. Same | |
| 579. |
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$? |
| A. | Receiver type compound engine |
| B. | Tandem type compound engine |
| C. | Woolf type compound engine |
| D. | Both (A) and (B) |
| Answer» D. Both (A) and (B) | |
| 580. |
Ultimate analysis of fuel is determination of percentage of$? |
| A. | Carbon, hydrogen, nitrogen, sulphur, moisture |
| B. | Fixed carbon, ash, volatile matter, moisture |
| C. | Higher calorific value |
| D. | Lower calorific value |
| Answer» B. Fixed carbon, ash, volatile matter, moisture | |
| 581. |
It is required to produce large amount of steam at low pressure. Which boiler should be used?$? |
| A. | Pulverized fuel fired boiler |
| B. | Cochran boiler |
| C. | Lancashire boiler |
| D. | Babcock and Wilcox boiler |
| Answer» D. Babcock and Wilcox boiler | |
| 582. |
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as$? |
| A. | Superheater |
| B. | Air-preheater |
| C. | Economizer |
| D. | Injector |
| Answer» C. Economizer | |
| 583. |
In a receiver type compound engine, the high pressure and low pressure cylinders$? |
| A. | Have common piston rod |
| B. | Are set at 90° |
| C. | Have separate piston rods |
| D. | Are set in V-arrangement |
| Answer» D. Are set in V-arrangement | |
| 584. |
Sublimation region is the region where$? |
| A. | Solid and vapor phases are in equilibrium |
| B. | Solid and liquid phases are in equilibrium |
| C. | Liquid and vapor phases are in equilibrium |
| D. | Solid, liquid and vapor phases are in equilibrium |
| Answer» B. Solid and liquid phases are in equilibrium | |
| 585. |
The draught produced by a steam jet issuing from a nozzle placed in the chimney is called$? |
| A. | Induced steam jet draught |
| B. | Chimney draught |
| C. | Forced steam jet draught |
| D. | None of these |
| Answer» B. Chimney draught | |
| 586. |
The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called$? |
| A. | Induced steam jet draught |
| B. | Chimney draught |
| C. | Forced steam jet draught |
| D. | None of these |
| Answer» D. None of these | |
| 587. |
The cylinder condensation or missing quantity may be reduced by$? |
| A. | The efficient steam jacketing of the cylinder walls |
| B. | Superheating the steam supplied to the engine cylinder |
| C. | Keeping the expansion ratio small in each cylinder |
| D. | All of the above |
| Answer» E. | |
| 588. |
The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become$? |
| A. | Wet |
| B. | Superheated |
| C. | Remain dry saturated |
| D. | Dry |
| Answer» C. Remain dry saturated | |
| 589. |
The safety valve at superheater as compared to drum safety valve setting is set at$? |
| A. | Higher value |
| B. | Lower value |
| C. | Same value |
| D. | Any value |
| Answer» C. Same value | |
| 590. |
Equivalent evaporation is the amount of water evaporated in a boiler from and at$? |
| A. | 0°C |
| B. | 100°C |
| C. | Saturation temperature at given pressure |
| D. | Room temperature |
| Answer» C. Saturation temperature at given pressure | |
| 591. |
The length of Cornish boiler varies from$? |
| A. | 2 to 4.5 m |
| B. | 3 to 5 m |
| C. | 5 to 7.5 m |
| D. | 7 to 9 m |
| Answer» D. 7 to 9 m | |
| 592. |
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.$? |
| A. | 0°C |
| B. | 40°C |
| C. | 60°C |
| D. | 100°C |
| Answer» E. | |
| 593. |
A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called$? |
| A. | Receiver type compound engine |
| B. | Tandem type compound engine |
| C. | Woolf type compound engine |
| D. | None of these |
| Answer» C. Woolf type compound engine | |
| 594. |
Locomotive boiler is a$? |
| A. | Single tube, horizontal, internally fired and stationary boiler |
| B. | Single tube, vertical, externally fired and stationary boiler |
| C. | Multi-tubular, horizontal, internally fired and mobile boiler |
| D. | Multi-tubular, horizontal, externally fired and stationary boiler |
| Answer» D. Multi-tubular, horizontal, externally fired and stationary boiler | |
| 595. |
Which is not the correct statement about moisture in coal?$? |
| A. | Inherent moisture and surface moisture are different things |
| B. | In some coals moisture may be present up to 40% |
| C. | Some moisture in coal helps in better burning which is not possible with completely dry coal |
| D. | It increases thermal efficiency |
| Answer» E. | |
| 596. |
Benson boiler requires$? |
| A. | No drum |
| B. | One drum |
| C. | Two drums |
| D. | Three drums |
| Answer» B. One drum | |
| 597. |
O‚ÇÇ content in atmospheric air on volume basis is$? |
| A. | 21 % |
| B. | 23 % |
| C. | 30 % |
| D. | 40 % |
| Answer» B. 23 % | |
| 598. |
In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure.$? |
| A. | Equal to |
| B. | Lower than |
| C. | Higher than |
| D. | None of these |
| Answer» D. None of these | |
| 599. |
The actual power supplied by the engine crankshaft is called$? |
| A. | Indicated power |
| B. | Brake power |
| C. | Frictional power |
| D. | None of these |
| Answer» C. Frictional power | |
| 600. |
Heating wet steam at constant temperature is heating it at constant$? |
| A. | Volume |
| B. | Pressure |
| C. | Entropy |
| D. | Enthalpy |
| Answer» C. Entropy | |