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.
| 451. |
Lancashire boiler is |
| A. | Stationary fire tube boiler |
| B. | Internally fired boiler |
| C. | Horizontal boiler |
| D. | All of these |
| Answer» E. | |
| 452. |
The number of flue tubes in Lancashire boiler is |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Four |
| Answer» D. Four | |
| 453. |
The bituminous coal is no caking if its carbon content is |
| A. | 78-81% |
| B. | 81-85% |
| C. | 85-90% |
| D. | 90-95% |
| Answer» B. 81-85% | |
| 454. |
The ratio of the workdone on the blades to the energy supplied to the blades, is called |
| A. | Blading efficiency |
| B. | Nozzle efficiency |
| C. | Gross or stage efficiency |
| D. | Mechanical efficiency |
| Answer» B. Nozzle efficiency | |
| 455. |
Green coal, in order to be burnt, must be |
| A. | Heated sufficiently |
| B. | Burnt in excess air |
| C. | Heated to its ignition point |
| D. | Burnt as powder |
| Answer» D. Burnt as powder | |
| 456. |
Incomplete combustion can be best judged by |
| A. | Smoky chimney exit |
| B. | Excess air in flue gases |
| C. | Measuring carbon monoxide in flue gases |
| D. | Measuring temperature of flue gases at exit of furnace |
| Answer» D. Measuring temperature of flue gases at exit of furnace | |
| 457. |
The efficiency of steam turbines may be improved by |
| A. | Reheating of steam |
| B. | Regenerative feed heating |
| C. | Binary vapor plant |
| D. | Any one of these |
| Answer» E. | |
| 458. |
Water and sediment in fuel oil can be removed by |
| A. | Heating the oil in the settling tanks |
| B. | Cooling the oil in the settling tanks |
| C. | Burning the oil |
| D. | Suspension |
| Answer» B. Cooling the oil in the settling tanks | |
| 459. |
While steam expands in turbines, theoretically the entropy |
| A. | Remains constant |
| B. | Increases |
| C. | Decreases |
| D. | Behaves unpredictably |
| Answer» B. Increases | |
| 460. |
Film boiling occurs at |
| A. | Very low pressure |
| B. | Atmospheric pressures |
| C. | Medium pressures |
| D. | Very high pressures |
| Answer» E. | |
| 461. |
The factor of evaporation for all boilers is always |
| A. | Equal to unity |
| B. | Less than unity |
| C. | Greater than unity |
| D. | None of these |
| Answer» D. None of these | |
| 462. |
Blow off cock in a boiler is used to |
| A. | Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required |
| B. | Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler |
| C. | Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit |
| D. | Increase the temperature of saturated steam without raising its pressure |
| Answer» C. Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit | |
| 463. |
The chimney draught varies with |
| A. | Climatic conditions |
| B. | Temperature of furnace gases |
| C. | Height of chimney |
| D. | All of these |
| Answer» E. | |
| 464. |
Heating of dry steam above saturation temperature is known as |
| A. | Enthalpy |
| B. | Superheating |
| C. | Super saturation |
| D. | Latent heat |
| Answer» C. Super saturation | |
| 465. |
The critical pressure ratio for initially dry saturated steam is |
| A. | 0.546 |
| B. | 0.577 |
| C. | 0.582 |
| D. | 0.601 |
| Answer» C. 0.582 | |
| 466. |
In forced circulation type boiler |
| A. | Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum |
| B. | Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam |
| C. | Feed pump is employed to supplement natural circulation in water wall type furnace |
| D. | Water is converted into steam in one pass without any recirculation |
| Answer» E. | |
| 467. |
In accelerated circulation type boiler |
| A. | Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum |
| B. | Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam |
| C. | Feed pump is employed to supplement natural circulation in water wall type furnace |
| D. | Water is converted into steam in one pass without any recirculation |
| Answer» C. Feed pump is employed to supplement natural circulation in water wall type furnace | |
| 468. |
The steam temperature with increase in load in case of a boiler fitted with radiation superheater |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | First increases and then decreases |
| Answer» C. Remain unaffected | |
| 469. |
The effect of super-saturation is that the |
| A. | Mass of the steam discharged increases |
| B. | Entropy and specific volume of the steam increases |
| C. | Exit velocity of steam reduces |
| D. | All of these |
| Answer» E. | |
| 470. |
When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by |
| A. | (h - hf1)/2257 |
| B. | (h + hf1)/2257 |
| C. | (h × hf1)/2257 |
| D. | None of these |
| Answer» B. (h + hf1)/2257 | |
| 471. |
By compounding the expansion of steam in two or more cylinders, the ratio of expansion |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» D. None of these | |
| 472. |
The critical pressure ratio for gases is |
| A. | 0.528 |
| B. | 0.546 |
| C. | 0.577 |
| D. | 0.582 |
| Answer» B. 0.546 | |
| 473. |
The biggest size of thermal power unit operating in India is |
| A. | 30 MW |
| B. | 60 MW |
| C. | 100 MW |
| D. | 500 MW |
| Answer» E. | |
| 474. |
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» C. Purchased from several parties and packed together at site | |
| 475. |
An air preheater is installed |
| A. | Before the economiser |
| B. | Before the superheater |
| C. | Between the economiser and chimney |
| D. | None of these |
| Answer» D. None of these | |
| 476. |
In regenerative air preheaters, the heat is transferred |
| A. | From a metal wall from one medium to another |
| B. | From heating an intermediate material and then heating the air from this material |
| C. | By direct mixing |
| D. | Heat is transferred by bleeding some gas from furnace |
| Answer» C. By direct mixing | |
| 477. |
In recuperative air preheaters, the heat is transferred |
| A. | From a metal wall from one medium to another |
| B. | From heating an intermediate material and then heating the air from this material |
| C. | By direct mixing |
| D. | Heat is transferred by bleeding some gases from furnace |
| Answer» B. From heating an intermediate material and then heating the air from this material | |
| 478. |
Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler? |
| A. | Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler |
| B. | Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler |
| C. | Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes |
| D. | Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube |
| Answer» D. Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube | |
| 479. |
The capacity of induced draft fan compared to forced draft fan in a boiler is |
| A. | Same |
| B. | More |
| C. | Less |
| D. | Less or more depending on size of boiler |
| Answer» C. Less | |
| 480. |
Besides mean effective pressure, the data required to determine the indicated power of an engine include |
| A. | Piston diameter, length of stroke and calorific value of fuel |
| B. | Piston diameter, specific fuel consumption and Calorific value of fuel |
| C. | Piston diameter, length of stroke and speed of rotation |
| D. | Specific fuel consumption, speed of rotation and torque |
| Answer» D. Specific fuel consumption, speed of rotation and torque | |
| 481. |
An air preheater |
| A. | Increases evaporative capacity of the boiler |
| B. | Increases the efficiency of the boiler |
| C. | Enables low grade fuel to be burnt |
| D. | All of the above |
| Answer» E. | |
| 482. |
The purpose of governing in steam turbines is to |
| A. | Maintain the speed of the turbine |
| B. | Reduce the effective heat drop |
| C. | Reheat the steam and improve its quality |
| D. | Completely balance against end thrust |
| Answer» B. Reduce the effective heat drop | |
| 483. |
The critical pressure ratio for initially wet steam is |
| A. | 0.546 |
| B. | 0.577 |
| C. | 0.582 |
| D. | 0.601 |
| Answer» D. 0.601 | |
| 484. |
Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to |
| A. | 421 kg.m |
| B. | 421 kg.m |
| C. | 539 kg.m |
| D. | 102 kg.m |
| Answer» B. 421 kg.m | |
| 485. |
The high pressure and low pressure cylinders in a receiver 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» C. 0° to each other | |
| 486. |
The high pressure and low pressure cylinders in a Tandem 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» D. None of these | |
| 487. |
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° to each other | |
| 488. |
Boiler parameters are expressed by |
| A. | Tonnes/hr. of steam |
| B. | Pressure of steam in kg/cm² |
| C. | Temperature of steam in °C |
| D. | All of the above |
| Answer» E. | |
| 489. |
The radius of a dished head is taken approximately as |
| A. | One fourth |
| B. | Half |
| C. | One |
| D. | Two |
| Answer» D. Two | |
| 490. |
The overall efficiency of thermal power plant is |
| A. | Boiler efficiency, turbine efficiency, generator efficiency |
| B. | All the three above plus gas cycle efficiency |
| C. | Carnot cycle efficiency |
| D. | Regenerative cycle efficiency |
| Answer» B. All the three above plus gas cycle efficiency | |
| 491. |
The shell of the Cochran boiler is made hemispherical |
| A. | To give maximum space and strength |
| B. | To withstand the pressure of steam inside the boiler |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 492. |
The value of the reheat factor varies from |
| A. | 1.02 to 1.06 |
| B. | 1.08 to 1.10 |
| C. | 1.2 to 1.6 |
| D. | 1.6 to 2 |
| Answer» B. 1.08 to 1.10 | |
| 493. |
The maximum efficiency of a reaction turbine is |
| A. | 2 sin²α/(1 + sin²α) |
| B. | 2 cos²α/(1 + cos²α) |
| C. | (1 + sin²α)/2 sin²α |
| D. | (1 + cos²α)/2 cos²α |
| Answer» C. (1 + sin²α)/2 sin²α | |
| 494. |
Adiabatic process is |
| A. | Essentially an isentropic process |
| B. | Non-heat transfer process |
| C. | Reversible process |
| D. | Constant temperature process |
| Answer» C. Reversible process | |
| 495. |
The function of a piston in a steam engine 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 id) to exhaust steam from the cylinder at proper moment |
| D. | None of these |
| Answer» D. None of these | |
| 496. |
The function of a safety valve is |
| A. | To blow off steam when the pressure of steam inside the boiler exceeds the working pressure |
| B. | To indicate the water level inside the boiler to an observer |
| C. | To measure pressure of steam inside the steam boiler |
| D. | None of the above |
| Answer» B. To indicate the water level inside the boiler to an observer | |
| 497. |
The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as |
| A. | Feed pump |
| B. | Injector |
| C. | Feed check valve |
| D. | Pressure gauge |
| Answer» B. Injector | |
| 498. |
The main object of a boiler trial is |
| A. | To determine the generating capacity of the boiler |
| B. | To determine the thermal efficiency of the boiler when working at a definite pressure |
| C. | To prepare heat balance sheet for the boiler |
| D. | All of the above |
| Answer» E. | |
| 499. |
The critical pressure ratio (p₂/p₁) is given by |
| A. | (p₂/p₁) = [2/(n - 1)] n/(n + 1) |
| B. | (p₂/p₁) = [2/(n + 1)] n/(n-1) |
| C. | (p₂/p₁) = [(n - 1)/2] n + (1/n) |
| D. | (p₂/p₁) = [(n + 1)/2] n - (1/n) |
| Answer» C. (p₂/p₁) = [(n - 1)/2] n + (1/n) | |
| 500. |
Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor) |
| A. | pa = pm/K |
| B. | pa = pm × K |
| C. | pa = K/pm |
| D. | pa = pm + K |
| Answer» C. pa = K/pm | |