MCQOPTIONS
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MCQOPTIONS
This section includes 564 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called |
| A. | Condenser efficiency |
| B. | Vacuum efficiency |
| C. | Nozzle efficiency |
| D. | Boiler efficiency |
| Answer» B. Vacuum efficiency | |
| 402. |
The condition of steam in boiler drum is always |
| A. | Dry |
| B. | Wet |
| C. | Saturated |
| D. | Supersaturated |
| Answer» C. Saturated | |
| 403. |
In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is |
| A. | 0.007 bar |
| B. | 0.053 bar |
| C. | 0.06 bar |
| D. | 0.067 bar |
| Answer» E. | |
| 404. |
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 | |
| 405. |
If partial pressure of air and steam be ‘pa’ and ‘ps’ respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to |
| A. | ps - pa |
| B. | pa - ps |
| C. | pa + ps |
| D. | None of these |
| Answer» D. None of these | |
| 406. |
Spontaneous combustion is a phenomenon in which |
| A. | All the fuel burns instantaneously producing high energy release |
| B. | Fuel burns with less air |
| C. | Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal |
| D. | Explosion in furnace |
| Answer» D. Explosion in furnace | |
| 407. |
The change in internal energy in steam engines equals to |
| A. | Work done during the Rankine cycle |
| B. | Work done during compression |
| C. | Work done during adiabatic expansion |
| D. | Change in enthalpy |
| Answer» B. Work done during compression | |
| 408. |
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» B. Separating calorimeter | |
| 409. |
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 | |
| 410. |
The friction in the nozzle __________ exit velocity of steam. |
| A. | Has no effect on |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 411. |
The velocity of steam at throat of the nozzle is __________ the velocity of sound. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 412. |
Locomotive type' boiler is |
| A. | Horizontal multi-tubular water tube boiler |
| B. | Water wall enclosed furnace type |
| C. | Vertical tubular fire tube type |
| D. | Horizontal multi-tubular fire tube type |
| Answer» E. | |
| 413. |
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» B. Less heating surface | |
| 414. |
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. | |
| 415. |
Relative percentage of heat absorbed through the heat transfer of(i) Furnace water wall(ii) Boiler tank(iii) Superheater(iv) Economizer(v) Air-heater of a typical boiler of 200 MW capacity would be of the order of |
| A. | 48 : 20 : 15 : 7 : 10 |
| B. | 10 : 7 : 15 : 20 : 48 |
| C. | 20 : 48 : 7 : 15 : 10 |
| D. | 7 : 15 : 20 : 10 : 48 |
| Answer» B. 10 : 7 : 15 : 20 : 48 | |
| 416. |
When steam after doing work in the cylinder passes into a condenser, the engine is said to be a |
| A. | Slow speed engine |
| B. | Vertical steam engine |
| C. | Condensing steam engine |
| D. | Non-condensing steam engine |
| Answer» D. Non-condensing steam engine | |
| 417. |
Desecration of feed water is carried out because it reduces |
| A. | Cavitation of boiler feed pumps |
| B. | Corrosion caused by oxygen |
| C. | Heat transfer coefficient |
| D. | pH value of water |
| Answer» C. Heat transfer coefficient | |
| 418. |
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 operating under the same operating conditions |
| D. | Any type of boilers operating under any conditions |
| Answer» E. | |
| 419. |
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. | |
| 420. |
A regenerative steam cycle renders |
| A. | Increased work output per unit mass of steam |
| B. | Decreased work output per unit mass of steam |
| C. | Increased thermal efficiency |
| D. | Decreased work output per unit mass of steam as well as increased thermal efficiency |
| Answer» E. | |
| 421. |
The critical pressure gives the velocity of steam at the throat |
| A. | Equal to the velocity of sound |
| B. | Less than the velocity of sound |
| C. | More than the velocity of sound |
| D. | None of these |
| Answer» B. Less than the velocity of sound | |
| 422. |
The diameter of fire tube of Cornish boiler compared to its shell is |
| A. | One half |
| B. | One third |
| C. | One fourth |
| D. | One fifth |
| Answer» B. One third | |
| 423. |
The diameter of internal flue tubes in a Lancashire boiler compared to its shell is |
| A. | One-half |
| B. | One-third |
| C. | Two-fourth |
| D. | Two-fifth |
| Answer» E. | |
| 424. |
The aim of a compound steam engine is |
| A. | To reduce the ratio of expansion in each cylinder |
| B. | To reduce the length of stroke |
| C. | To reduce the temperature range in each cylinder |
| D. | All of the above |
| Answer» E. | |
| 425. |
The clearance in the engine cylinder |
| A. | Increases the mean effective pressure |
| B. | Increases the workdone |
| C. | Decreases the efficiency of the engine |
| D. | All of these |
| Answer» E. | |
| 426. |
The theoretical indicator diagram of a simple steam engine is based upon the assumption that |
| A. | There is no pressure drop due to condensation |
| B. | Steam is admitted at boiler pressure and exhausted at condenser pressure |
| C. | The expansion (or compression) of the steam is hyperbolic |
| D. | All of the above |
| Answer» E. | |
| 427. |
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 | |
| 428. |
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called |
| A. | Natural draught |
| B. | Induced draught |
| C. | Forced draught |
| D. | Balanced draught |
| Answer» C. Forced draught | |
| 429. |
In cross compounding, the cylinders are arranged |
| A. | Side by side and each cylinder has common piston, connecting rod and crank |
| B. | Side by side and each cylinder has separate piston, connecting rod and crank |
| C. | At 90° and each cylinder has common piston, connecting rod and crank |
| D. | At 90° and each cylinder has separate piston, connecting rod and crank |
| Answer» C. At 90° and each cylinder has common piston, connecting rod and crank | |
| 430. |
Hard coke is used in |
| A. | Cement industry |
| B. | Thermal power plant |
| C. | Blast furnace |
| D. | Domestic use |
| Answer» D. Domestic use | |
| 431. |
Degree of reaction is defined as the ratio of |
| A. | Heat drop in fixed blades to the heat drop in moving blades |
| B. | Heat drop in moving blades to the heat drop in fixed blades |
| C. | Heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades |
| D. | Heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades |
| Answer» D. Heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades | |
| 432. |
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 | |
| 433. |
The average value of diagram factor lies between |
| A. | 0.2 to 0.5 |
| B. | 0.5 to 0.65 |
| C. | 0.65 to 0.9 |
| D. | 0.8 to 1.2 |
| Answer» D. 0.8 to 1.2 | |
| 434. |
The value of diagram factor depends upon |
| A. | Initial conditions of steam |
| B. | Back pressure |
| C. | Initial pressure of steam |
| D. | All of these |
| Answer» E. | |
| 435. |
The reheat factor depends upon |
| A. | Initial pressure and superheat |
| B. | Exit pressure |
| C. | Turbine stage efficiency |
| D. | All of these |
| Answer» E. | |
| 436. |
The Parsons' reaction turbine has |
| A. | Only moving blades |
| B. | Only fixed blades |
| C. | Identical fixed and moving blades |
| D. | Fixed and moving blades of different shape |
| Answer» D. Fixed and moving blades of different shape | |
| 437. |
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 | |
| 438. |
A nozzle is said to be a convergent nozzle |
| A. | When the cross-section of the nozzle increases continuously from entrance to exit |
| B. | When the cross-section of the nozzle decreases continuously from entrance to exit |
| C. | When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit |
| D. | None of the above |
| Answer» C. When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit | |
| 439. |
In an impulse reaction turbine, the pressure drops gradually and continuously over |
| A. | Fixed blades |
| B. | Moving blades |
| C. | Both fixed and moving blades |
| D. | None of these |
| Answer» D. None of these | |
| 440. |
The rate of steam produced in Benson boiler is |
| A. | 100 tonnes/h |
| B. | 135 tonnes/h |
| C. | 175 tonnes/h |
| D. | 250 tonnes/h |
| Answer» C. 175 tonnes/h | |
| 441. |
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. | |
| 442. |
The draught may be produced by a |
| A. | Mechanical fan |
| B. | Chimney |
| C. | A steam jet |
| D. | All of these |
| Answer» E. | |
| 443. |
In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of |
| A. | 10 atmospheres |
| B. | 20 atmospheres |
| C. | 30 atmospheres |
| D. | 40 atmospheres |
| Answer» C. 30 atmospheres | |
| 444. |
Which of the following is required for a steam condensing plant? |
| A. | Condenser |
| B. | Condensate pump |
| C. | Air extraction pump |
| D. | All of these |
| Answer» E. | |
| 445. |
An economiser _________ the steam raising capacity of a boiler. |
| A. | Increases |
| B. | Decreases |
| C. | Has no effect on |
| D. | None of these |
| Answer» B. Decreases | |
| 446. |
Cochran boiler is a |
| A. | Horizontal fire tube boiler |
| B. | Horizontal water tube boiler |
| C. | Vertical water tube boiler |
| D. | Vertical fire tube boiler |
| Answer» E. | |
| 447. |
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 | |
| 448. |
The velocity of whirl at outlet for an axial discharge turbine is |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | None of these |
| Answer» D. None of these | |
| 449. |
The efficiency of the plant __________ with the mechanical draught. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of these |
| Answer» B. Decreases | |
| 450. |
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. | Moisture present in fuel and steam formed by combustion of hydrogen in fuel |
| D. | All of the above |
| Answer» E. | |