MCQOPTIONS
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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
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 | |
| 452. |
A turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion. |
| A. | 60 |
| B. | 90 |
| C. | 180 |
| D. | 270 |
| Answer» C. 180 | |
| 453. |
The diesel engines are also known as __________ engines. |
| A. | compression ignition |
| B. | spark ignition |
| Answer» B. spark ignition | |
| 454. |
In hit and miss governing, the fuel supply is cut-off completely during one or more number of cycles. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 455. |
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be |
| A. | 25% |
| B. | 50% |
| C. | 70% |
| D. | 100% |
| Answer» C. 70% | |
| 456. |
The ratio of total useful heat drop to the total isentropic heat drop, is called |
| A. | stage efficiency |
| B. | internal efficiency |
| C. | Rankine efficiency |
| D. | none of these |
| Answer» C. Rankine efficiency | |
| 457. |
The pressure at which the steam leaves the nozzle is known as back pressure. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 458. |
All the commercial liquid fuels are derived from natural petroleum (or crude oil). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 459. |
The stability of a dam is checked for |
| A. | tension at the base |
| B. | overturning of the wall or dam |
| C. | sliding of the wall or dam |
| D. | all of these |
| Answer» E. | |
| 460. |
An ideal fluid is frictionless and incompressible. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 461. |
The centre of gravity of the volume of the liquid displaced is called |
| A. | centre of pressure |
| B. | centre of buoyancy |
| C. | metacentre |
| D. | none of these |
| Answer» C. metacentre | |
| 462. |
The pressure less than atmospheric pressure is known as |
| A. | suction pressure |
| B. | vacuum pressure |
| C. | negative gauge pressure |
| D. | all of these |
| Answer» E. | |
| 463. |
The total energy line lies over the hydraulic gradient line by an amount equal to the |
| A. | pressure head |
| B. | velocity head |
| C. | pressure head + velocity head |
| D. | pressure head - velocity head |
| Answer» C. pressure head + velocity head | |
| 464. |
A structure whose width is __________ the width of the channel, is called a flumed structure. |
| A. | less than |
| B. | more than |
| Answer» B. more than | |
| 465. |
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is |
| A. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-170-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-170-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-170-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-170-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/163-170-4.png"> | |
| 466. |
Which of the following is an example of laminar flow? |
| A. | Under ground flow |
| B. | Flow past tiny bodies |
| C. | Flow of oil in measuring instruments |
| D. | all of these |
| Answer» E. | |
| 467. |
The maximum efficiency of transmission through a pipe is |
| A. | 50% |
| B. | 56.7% |
| C. | 66.67% |
| D. | 76.66% |
| Answer» D. 76.66% | |
| 468. |
The coefficient of viscosity may be determined by |
| A. | capillary tube method |
| B. | orifice type viscometer |
| C. | rotating cylinder method |
| D. | all of these |
| Answer» E. | |
| 469. |
Coefficient of contraction is the ratio of |
| A. | actual velocity of jet at vena contracta to the theoretical velocity |
| B. | loss of head in the orifice to the head of water available at the exit of the orifice |
| C. | actual discharge through an orifice to the theoretical discharge |
| D. | area of jet at vena contracta to the area of orifice |
| Answer» E. | |
| 470. |
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy 's coefficient of friction for pipe, and l = Length of pipe ) |
| A. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/171-255-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/171-255-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/171-255-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/171-255-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/171-255-4.png"> | |
| 471. |
In a free nappe, |
| A. | the pressure below the nappe is atmospheric |
| B. | the pressure below the nappe is negative |
| C. | the pressure above the nappe is atmospheric |
| D. | the pressure above the nappe is negative |
| Answer» B. the pressure below the nappe is negative | |
| 472. |
The Reynold's number of a ship is __________ to its velocity and length. |
| A. | directly proportional |
| B. | inversely proportional |
| Answer» B. inversely proportional | |
| 473. |
When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water. |
| A. | True |
| B. | False |
| Answer» C. | |
| 474. |
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be |
| A. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/162-164-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/162-164-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/162-164-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/162-164-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/162-164-2.png"> | |
| 475. |
A flow in which the volume of a fluid and its density does not change during the flow is called __________ flow. |
| A. | incompressible |
| B. | compressible |
| Answer» B. compressible | |
| 476. |
The loss of head due to an obstruction in a pipe is twice the loss of head at its entrance. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 477. |
A siphon is used to connect two reservoirs at different levels intervened by a high ridge. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 478. |
Coefficient of resistance is the ratio of |
| A. | actual velocity of jet at vena contracta to the theoretical velocity |
| B. | area of jet at vena contracta to the area of orifice |
| C. | loss of head in the orifice to the head of water available at the exit of the orifice |
| D. | actual discharge through an orifice to the dieoretical discharge |
| Answer» D. actual discharge through an orifice to the dieoretical discharge | |
| 479. |
In order to measure the flow with a venturimeter, it is installed in |
| A. | horizontal line |
| B. | inclined line with flow upwards |
| C. | inclined line with flow downwards |
| D. | any direction and in any location |
| Answer» E. | |
| 480. |
The sum of internal energy (U) and the product of pressure and volume (p.v) is known as |
| A. | workdone |
| B. | entropy |
| C. | enthalpy |
| D. | none of these |
| Answer» D. none of these | |
| 481. |
One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas. |
| A. | 8/3 |
| B. | 11/3 |
| C. | 11/7 |
| D. | 7/3 |
| Answer» E. | |
| 482. |
The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 483. |
The constant pressure, constant volume and constant pvn processes are regarded as irreversible process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 484. |
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel. |
| A. | atomisation |
| B. | carbonisation |
| Answer» C. | |
| 485. |
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called |
| A. | cracking |
| B. | carbonisation |
| C. | fractional distillation |
| D. | full distillation |
| Answer» D. full distillation | |
| 486. |
Carbonisation of coal consists of |
| A. | drying and crushing the coal to a fine powder |
| B. | moulding the finely ground coal under pressure with or without a binding material |
| C. | heating the wood with a limited supply of air to temperature not less than 280 C |
| D. | none of the above |
| Answer» E. | |
| 487. |
The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv). |
| A. | less than |
| B. | equal to |
| C. | more than |
| Answer» D. | |
| 488. |
The entropy __________ in an irreversible cyclic process. |
| A. | remains constant |
| B. | decreases |
| C. | increases |
| Answer» D. | |
| 489. |
The efficiency of Diesel cycle approaches to Otto cycle efficiency when |
| A. | cut-off is increased |
| B. | cut-off is decreased |
| C. | cut-off is zero |
| D. | cut-off is constant |
| Answer» D. cut-off is constant | |
| 490. |
The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is |
| A. | equal to one |
| B. | less than one |
| C. | greater than one |
| D. | none of these |
| Answer» D. none of these | |
| 491. |
Which of the following has the minimum atomic mass? |
| A. | Oxygen |
| B. | Sulphur |
| C. | Nitrogen |
| D. | Carbon |
| Answer» E. | |
| 492. |
The atomic mass of oxygen is |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 32 |
| Answer» D. 32 | |
| 493. |
Workdone in a free expansion process is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | positive |
| Answer» B. minimum | |
| 494. |
The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas. |
| A. | one-half |
| B. | one-third |
| C. | two-third |
| D. | three-fourth |
| Answer» D. three-fourth | |
| 495. |
The compression ratio for petrol engines is |
| A. | 3 to 6 |
| B. | 5 to 8 |
| C. | 15 to 20 |
| D. | 20 to 30 |
| Answer» C. 15 to 20 | |
| 496. |
Water gas is obtained by passing air and a large amount of steam over waste coal at about 650 C. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 497. |
When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 498. |
Which of the following is the lightest and most volatile liquid fuel? |
| A. | Gasoline |
| B. | Kerosene |
| C. | Fuel oil |
| Answer» B. Kerosene | |
| 499. |
Which of the following represents Otto cycle on temperature - entropy (T - s) diagram? |
| A. | <img src="/_files/images/mechanical-engineering/thermodynamics/251-214-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/thermodynamics/251-214-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/thermodynamics/251-214-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/thermodynamics/251-214-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/thermodynamics/251-214-4.png"> | |
| 500. |
The efficiency of Stirling cycle is __________ Carnot cycle. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| Answer» D. | |