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.
| 351. |
Which type of boiler can meet rapid changes of load? |
| A. | Vertical fire tube type |
| B. | Horizontal fire tube type |
| C. | Horizontal water tube type |
| D. | Forced circulation type |
| Answer» E. | |
| 352. |
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine. |
| A. | Equal to |
| B. | Twice |
| C. | Three times |
| D. | Four times |
| Answer» C. Three times | |
| 353. |
Steam turbines are used for |
| A. | Large marine propulsion |
| B. | Electric power generation |
| C. | Direct drive of fans, compressors, pumps |
| D. | All of these |
| Answer» E. | |
| 354. |
Which of the following varieties of coals is mostly used in steam boilers? |
| A. | Non-coking bituminous coal |
| B. | Brown coal |
| C. | Peat |
| D. | None of the above |
| Answer» E. | |
| 355. |
Presence of moisture in fuel oil would |
| A. | Keep the burner tips cool |
| B. | Aid in proper combustion |
| C. | Because sputtering, possibly extinguishing flame |
| D. | Clean the nozzles |
| Answer» D. Clean the nozzles | |
| 356. |
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» D. Control steam dome | |
| 357. |
The natural draught is produced by |
| A. | Steam jet |
| B. | Centrifugal fan |
| C. | Chimney |
| D. | Both (A) and (B) |
| Answer» D. Both (A) and (B) | |
| 358. |
The artificial draught is produced by |
| A. | Steam jet |
| B. | Centrifugal fan |
| C. | Chimney |
| D. | Both (A) and (B) |
| Answer» E. | |
| 359. |
The object of producing draught in a boiler is |
| A. | To provide an adequate supply of air for the fuel combustion |
| B. | To exhaust the gases of combustion from the combustion chamber |
| C. | To discharge the gases of combustion to the atmosphere through the chimney |
| D. | All of the above |
| Answer» E. | |
| 360. |
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» D. Steam entropy remains constant | |
| 361. |
The major axis of elliptical manholes on the shell should be provided |
| A. | Longitudinally |
| B. | Circumferentially |
| C. | On dished end |
| D. | Anywhere |
| Answer» C. On dished end | |
| 362. |
An economiser is installed in a boiler primarily to |
| A. | Superheat the steam |
| B. | Reduce fuel consumption |
| C. | Increase steam pressure |
| D. | All of these |
| Answer» C. Increase steam pressure | |
| 363. |
The selection of type and size of a steam boiler depends upon |
| A. | The power required and working pressure |
| B. | The geographical position of the power house |
| C. | The fuel and water available |
| D. | All of the above |
| Answer» E. | |
| 364. |
Which of the following are boiler accessories? |
| A. | Economizer |
| B. | Superheater |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» D. None of these | |
| 365. |
In designing air preheaters, the important design consideration is that |
| A. | Approach temperature should be as low as possible |
| B. | Handling and maintenance should be easier |
| C. | Heat transfer area should be optimum |
| D. | Stack gases should not be cooled to the dew point |
| Answer» E. | |
| 366. |
In locomotives, the draught is produced by |
| A. | Chimney |
| B. | Induced draft fan |
| C. | Both combined (A) and (B) |
| D. | Steam jet draught |
| Answer» E. | |
| 367. |
Lancashire boiler is of |
| A. | Stationary < fire tube type |
| B. | Horizontal type |
| C. | Natural circulation type |
| D. | All of the above |
| Answer» E. | |
| 368. |
100% efficiency of a thermal cycle cannot be achieved because of |
| A. | Frictional losses |
| B. | It is not possible to achieve 0°K temperature |
| C. | Leakage |
| D. | Non availability of ideal substance |
| Answer» C. Leakage | |
| 369. |
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» B. More | |
| 370. |
In water wall furnace, the heat is transferred to the water walls by |
| A. | Convection |
| B. | Radiation |
| C. | Conduction |
| D. | Radiation and conduction |
| Answer» C. Conduction | |
| 371. |
In a reaction turbine, when steam flows through the moving blades, |
| A. | Pressure increases while velocity decreases |
| B. | Pressure decreases while velocity increases |
| C. | Pressure and velocity both decreases |
| D. | Pressure and velocity both increases |
| Answer» D. Pressure and velocity both increases | |
| 372. |
Locomotive boiler is of the following type |
| A. | Multi tubular |
| B. | Horizontal |
| C. | Internally fired |
| D. | All of the above |
| Answer» E. | |
| 373. |
The diameter of flue tube in a Cornish boiler is _________ that of the shell. |
| A. | One-fourth |
| B. | One-third |
| C. | Two-fifth |
| D. | Three-fifth |
| Answer» E. | |
| 374. |
The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell. |
| A. | One-fourth |
| B. | One-third |
| C. | Two-fifth |
| D. | One-half |
| Answer» D. One-half | |
| 375. |
The cylindrical shell of a Lancashire boiler has diameter from |
| A. | 1 to 2 m |
| B. | 1.25 to 2.25 m |
| C. | 1.5 to 2.5 m |
| D. | 1.75 to 2.75 m |
| Answer» E. | |
| 376. |
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» D. Outside temperature is very low | |
| 377. |
The effect of friction on the flow of steam through a nozzle is to |
| A. | Decrease the mass flow rate and to increase the wetness of steam |
| B. | Increase the mass flow rate and to increase the exit temperature |
| C. | Decrease the mass flow rate and to decrease the wetness of steam |
| D. | Increase the exit temperature without any effect on mass flow rate |
| Answer» D. Increase the exit temperature without any effect on mass flow rate | |
| 378. |
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required. |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | None of these |
| Answer» C. Equal | |
| 379. |
Alkaline pyrogallate is used in Orsat's apparatus for absorption of |
| A. | CO₂ |
| B. | CO |
| C. | O₂ |
| D. | N₂ |
| Answer» D. N₂ | |
| 380. |
In fire tube boilers |
| A. | Water passes through the tubes which are surrounded by flames and hot gases |
| B. | The flames and hot gases pass through the tubes which are surrounded by water |
| C. | Forced circulation takes place |
| D. | None of these |
| Answer» C. Forced circulation takes place | |
| 381. |
Pick up the wrong statement about water tube boiler in comparison to fire tube boilers |
| A. | Former occupies less space for same power |
| B. | Rate of steam flow is more in former case |
| C. | Former is used for high installed capacity |
| D. | Chances of explosion are less in former case |
| Answer» E. | |
| 382. |
Which of the following is a fire tube boiler? |
| A. | Lancashire boiler |
| B. | Babcock and Wilcox boiler |
| C. | Yarrow boiler |
| D. | None of these |
| Answer» B. Babcock and Wilcox boiler | |
| 383. |
For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler. |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | None of these |
| Answer» B. Less | |
| 384. |
Steam turbines may be classified according to |
| A. | Direction of steam flow |
| B. | Number of stages |
| C. | Mode of steam action |
| D. | All of these |
| Answer» E. | |
| 385. |
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 | |
| 386. |
At critical point, i.e. p=225.65 kg/cm², the latent enthalpy of vaporisation is |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Depends on temperature also |
| Answer» D. Depends on temperature also | |
| 387. |
The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called |
| A. | Safety valve |
| B. | Water level indicator |
| C. | Pressure gauge |
| D. | Fusible plug |
| Answer» B. Water level indicator | |
| 388. |
The ratio of the work-done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called |
| A. | Blading efficiency |
| B. | Nozzle efficiency |
| C. | Stage efficiency |
| D. | Mechanical efficiency |
| Answer» D. Mechanical efficiency | |
| 389. |
For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is |
| A. | 1 kg |
| B. | 4/3 kg |
| C. | 8/3 kg |
| D. | 2 kg |
| Answer» C. 8/3 kg | |
| 390. |
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 | |
| 391. |
The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by |
| A. | V = 2g H' |
| B. | V = 2g/H' |
| C. | V = H'/2g |
| D. | V = 2gH' |
| Answer» B. V = 2g/H' | |
| 392. |
In order to reduce the rotor speed of an impulse turbine, the method employed is |
| A. | Velocity compounding |
| B. | Pressure compounding |
| C. | Pressure-velocity compounding |
| D. | All of these |
| Answer» E. | |
| 393. |
Which of the following gases has the highest calorific value? |
| A. | Producer gas |
| B. | Coal gas |
| C. | Water gas |
| D. | Blast furnace gas |
| Answer» C. Water gas | |
| 394. |
The heat balance sheet for the boiler shows the |
| A. | Complete account of heat supplied by 1 kg of dry fuel and the heat consumed |
| B. | Moisture present in the fuel |
| C. | Steam formed by combustion of hydrogen per kg of fuel |
| D. | All of the above |
| Answer» B. Moisture present in the fuel | |
| 395. |
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 | |
| 396. |
Which of the following is not a boiler mounting? |
| A. | Blow off cock |
| B. | Feed check valve |
| C. | Economiser |
| D. | Fusible plug |
| Answer» D. Fusible plug | |
| 397. |
The effect of bleeding is that |
| A. | It increases the thermodynamic efficiency of the turbine |
| B. | Boiler is supplied with hot water |
| C. | It decreases the power developed by the turbine |
| D. | All of the above |
| Answer» E. | |
| 398. |
For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then |
| A. | α₁ = α₂ and β₁ = β₂ |
| B. | α₁ = β₁ and α₂= β₂ |
| C. | α₁ < β₁ and α₂ > β₂ |
| D. | α₁ = β₂ and β₁ = α₂ |
| Answer» C. α₁ < β₁ and α₂ > β₂ | |
| 399. |
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. | |
| 400. |
Lancashire boiler has __________ internal flue tubes. |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |