MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be |
| A. | 0.4 |
| B. | 0.56 |
| C. | 0.67 |
| D. | 1.67 |
| Answer» B. 0.56 | |
| 2. |
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 | |
| 3. |
In a nozzle, whole frictional loss is assumed to occur between |
| A. | inlet and thoroat |
| B. | inlet and outlet |
| C. | throat and exit |
| D. | all of these |
| Answer» D. all of these | |
| 4. |
The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced. |
| A. | remains same |
| B. | decreases |
| C. | increases |
| Answer» D. | |
| 5. |
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle) |
| A. | remains constant |
| B. | decreases |
| C. | increases |
| Answer» B. decreases | |
| 6. |
The pressure at which the steam leaves the nozzle is known as back pressure. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 7. |
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 | |
| 8. |
The flow through a nozzle is regarded as |
| A. | constant volume flow |
| B. | constant pressure flow |
| C. | isothermal flow |
| D. | isentropic flow |
| Answer» E. | |
| 9. |
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° | |
| 10. |
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 | |
| 11. |
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 | |
| 12. |
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 | |
| 13. |
Workdone in a free expansion process is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | positive |
| Answer» B. minimum | |
| 14. |
Which of the following has the minimum atomic mass? |
| A. | Oxygen |
| B. | Sulphur |
| C. | Nitrogen |
| D. | Carbon |
| Answer» E. | |
| 15. |
The processes occuring in open system which permit the transfer of mass to and from the system, are known as |
| A. | flow processes |
| B. | non-flow processes |
| C. | adiabatic processes |
| D. | none of these |
| Answer» B. non-flow processes | |
| 16. |
Which of the following is the lightest and most volatile liquid fuel? |
| A. | Gasoline |
| B. | Kerosene |
| C. | Fuel oil |
| Answer» B. Kerosene | |
| 17. |
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 | |
| 18. |
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. | |
| 19. |
An adiabatic process is one in which |
| A. | no heat enters or leaves the gas |
| B. | the temperature of the gas changes |
| C. | the change in internal energy is equal to the mechanical workdone |
| D. | all of the above |
| Answer» E. | |
| 20. |
There is a loss of heat in an irreversible process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called |
| A. | specific heat at constant volume |
| B. | specific heat at constant pressure |
| C. | kilo Joule |
| D. | none of these |
| Answer» B. specific heat at constant pressure | |
| 22. |
The efficiency and work ratio of a simple gas turbine cycle are |
| A. | low |
| B. | very low |
| C. | high |
| D. | very high |
| Answer» C. high | |
| 23. |
A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as |
| A. | Carnot cycle |
| B. | Stirling cycle |
| C. | Otto cycle |
| D. | Diesel cycle |
| Answer» E. | |
| 24. |
All the commercial liquid fuels are derived from natural petroleum (or crude oil). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 25. |
A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 26. |
Barometer is used to measure |
| A. | velocity of liquid |
| B. | atmospheric pressure |
| C. | pressure in pipes and channels |
| D. | difference of pressure between two points in a pipe |
| Answer» C. pressure in pipes and channels | |
| 27. |
The hydraulic gradient line is always parallel to the centre line of the pipe. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 28. |
The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface) |
| A. | w |
| B. | wh |
| C. | w/h |
| D. | h/w |
| Answer» C. w/h | |
| 29. |
Water is a __________ fluid. |
| A. | real |
| B. | ideal |
| C. | newtonian |
| D. | non-newtonian |
| Answer» D. non-newtonian | |
| 30. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct? |
| A. | The pressure on the wall at the liquid level is minimum |
| B. | The pressure on the bottom of the wall is maximum. |
| C. | The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum |
| D. | The pressure on the bottom of the wall is zero. |
| Answer» D. The pressure on the bottom of the wall is zero. | |
| 31. |
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is |
| A. | 0.46 |
| B. | 0.64 |
| C. | 0.78 |
| D. | 0.87 |
| Answer» C. 0.78 | |
| 32. |
The vacuum pressure can be measured with the help of a piezometer tube. |
| A. | True |
| B. | False |
| Answer» C. | |
| 33. |
The pressure of the liquid flowing through the divergent portion of a venturimeter |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | depends upon mass of liquid |
| Answer» D. depends upon mass of liquid | |
| 34. |
The volume of a fluid __________ as the pressure increases. |
| A. | remains same |
| B. | decreases |
| C. | increases |
| Answer» C. increases | |
| 35. |
An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice. |
| A. | less than twice |
| B. | more than twice |
| C. | less than three times |
| D. | more than three times |
| Answer» D. more than three times | |
| 36. |
A body will begin to move down an inclined plane if the angle of inclination of the plane is __________ the angle of friction. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 37. |
Static friction is always __________ dynamic friction. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 38. |
Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 39. |
A smooth cylinder lying on its convex surface remains in __________ equilibrium. |
| A. | stable |
| B. | unstable |
| C. | neutral |
| Answer» C. neutral | |
| 40. |
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is |
| A. | 30° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» E. | |
| 41. |
A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by(where μ = tanφ = Coefficient of friction between the plane and the body.) |
| A. | P = W tanα |
| B. | P = W tan(α + φ) |
| C. | P = W (sinα + μcosα) |
| D. | P = W (cosα + μsinα) |
| Answer» D. P = W (cosα + μsinα) | |
| 42. |
The angle of inclination of a vehicle when moving along a circular path __________ upon its mass. |
| A. | depends |
| B. | does not depend |
| Answer» C. | |
| 43. |
The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection. |
| A. | less than |
| B. | more than |
| C. | equal to |
| Answer» C. equal to | |
| 44. |
The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is |
| A. | sin θ |
| B. | cos θ |
| C. | tan θ |
| D. | cosec θ |
| Answer» B. cos θ | |
| 45. |
The coefficient of restitution for elastic bodies is one. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 46. |
The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 47. |
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity |
| A. | v |
| B. | v/2 |
| C. | v/4 |
| D. | v/8 |
| Answer» C. v/4 | |
| 48. |
The friction experienced by a body, when in motion, is known as |
| A. | rolling friction |
| B. | dynamic friction |
| C. | limiting friction |
| D. | static friction |
| Answer» C. limiting friction | |
| 49. |
According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction. |
| A. | True |
| B. | False |
| Answer» C. | |