MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The pressure of air __________ with the increase of height from the surface of the earth. |
| A. | oes not change |
| B. | ecreases |
| C. | ncreases |
| D. | one of these |
| Answer» C. ncreases | |
| 52. |
The point at which the resultant pressure on an immersed surface acts, is known as |
| A. | entre of gravity |
| B. | entre of depth |
| C. | entre of pressure |
| D. | entre of immersed surface |
| Answer» D. entre of immersed surface | |
| 53. |
The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by |
| A. | 2(Vr - v) v]/ Vr² |
| B. | 2(Vr + v) v]/ Vr² |
| C. | (Vr - v) v]/ Vr |
| D. | (Vr + v) v]/ Vr |
| Answer» B. 2(Vr + v) v]/ Vr² | |
| 54. |
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be |
| A. | ame |
| B. | .75 B.H.P |
| C. | .H.P./0.75 |
| D. | .5 B.H.P |
| Answer» C. .H.P./0.75 | |
| 55. |
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if |
| A. | he area is horizontal |
| B. | he area is vertical |
| C. | he area is inclined |
| D. | ll of the above |
| Answer» E. | |
| 56. |
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension) |
| A. | wd/σ cosα |
| B. | cosα/4wd |
| C. | σ cosα/wd |
| D. | d/4σ cosα |
| Answer» D. d/4σ cosα | |
| 57. |
The viscosity of water at 20°C is |
| A. | ne stoke |
| B. | ne centistoke |
| C. | ne poise |
| D. | ne centipoise |
| Answer» E. | |
| 58. |
The intensity of pressure at any point, in a liquid, is |
| A. | irectly proportional to the area of the vessel containing liquid |
| B. | irectly proportional to the depth of liquid from the surface |
| C. | irectly proportional to the length of the vessel containing liquid |
| D. | nversely proportional to the depth of liquid from the surface |
| Answer» C. irectly proportional to the length of the vessel containing liquid | |
| 59. |
The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is |
| A. | irectly proportional to (radius)2 |
| B. | nversely proportional to (radius)2 |
| C. | irectly proportional to (radius)4 |
| D. | nversely proportional to (radius)4 |
| Answer» D. nversely proportional to (radius)4 | |
| 60. |
The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to |
| A. | Pa |
| B. | 1 Pa |
| C. | 81 Pa |
| D. | 810 Pa |
| Answer» E. | |
| 61. |
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as |
| A. | arrow-crested weir |
| B. | road-crested weir |
| C. | gee weir |
| D. | ubmerged weir |
| Answer» E. | |
| 62. |
If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium. |
| A. | eutral |
| B. | table |
| C. | nstable |
| D. | one of these |
| Answer» B. table | |
| 63. |
A flow through a long pipe at decreasing rate is called __________ uniform flow. |
| A. | teady |
| B. | nsteady |
| C. | oth A and B |
| D. | one of these |
| Answer» C. oth A and B | |
| 64. |
The surface tension of mercury at normal temperature is __________ that of water. |
| A. | ame as |
| B. | ower than |
| C. | igher than |
| D. | one of these |
| Answer» D. one of these | |
| 65. |
The highest efficiency is obtained with a channel of __________ section. |
| A. | ircular |
| B. | quare |
| C. | ectangular |
| D. | rapezoidal |
| Answer» E. | |
| 66. |
When the Venturimeter is inclined, then for a given flow it will show __________ reading. |
| A. | ame |
| B. | ore |
| C. | ess |
| D. | one of these |
| Answer» B. ore | |
| 67. |
A notch is used to measure __________ of liquids. |
| A. | ressure |
| B. | ischarge |
| C. | elocity |
| D. | olume |
| Answer» C. elocity | |
| 68. |
A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will |
| A. | ncrease |
| B. | ecrease |
| C. | emain same |
| D. | ncrease/decrease depending on depth of immersion |
| Answer» D. ncrease/decrease depending on depth of immersion | |
| 69. |
The pressure of liquid at throat in a Venturimeter is __________ than that at inlet. |
| A. | igher |
| B. | ower |
| C. | ame |
| D. | one of these |
| Answer» C. ame | |
| 70. |
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is |
| A. | ₁²/2g |
| B. | ₂²/2g |
| C. | .5 v₁²/2g |
| D. | .375 v₂²/2g |
| Answer» E. | |
| 71. |
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is |
| A. | .84(L - 0.1nH)H3/2 |
| B. | .84(L - nH)H2 |
| C. | .84(L - 0.1nH)H5/2 |
| D. | .84(L - nH)H3 |
| Answer» B. .84(L - nH)H2 | |
| 72. |
A channel is said to be of most economical cross-section, if |
| A. | t gives maximum discharge for a given cross-sectional area and bed slope |
| B. | t has minimum wetted perimeter |
| C. | t involves lesser excavation for the designed amount of discharge |
| D. | ll of the above |
| Answer» E. | |
| 73. |
The discharge in an open channel corresponding to critical depth is |
| A. | ero |
| B. | inimum |
| C. | aximum |
| D. | one of these |
| Answer» D. one of these | |
| 74. |
Coefficient of velocity is defined as the ratio of |
| A. | ctual velocity of jet at vena contracta to the theoretical velocity |
| B. | rea of jet at vena contracta to the area of orifice |
| C. | ctual discharge through an orifice to the theoretical discharge |
| D. | one of the above |
| Answer» B. rea of jet at vena contracta to the area of orifice | |
| 75. |
A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow. |
| A. | ncompressible |
| B. | ompressible |
| C. | iscous |
| D. | one of these |
| Answer» B. ompressible | |
| 76. |
If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by |
| A. | = Hg/hf |
| B. | = Hg × hf |
| C. | = Hg + hf |
| D. | = Hg - hf |
| Answer» E. | |
| 77. |
Which of the following meters is not associated with viscosity? |
| A. | ed wood |
| B. | ay bolt |
| C. | ngler |
| D. | rsat |
| Answer» E. | |
| 78. |
A flow in which __________ force is dominating over the viscosity is called turbulent flow. |
| A. | lastic |
| B. | urface tension |
| C. | iscous |
| D. | nertia |
| Answer» E. | |
| 79. |
An orifice is said to be large, if |
| A. | he size of orifice is large |
| B. | he velocity of flow is large |
| C. | he available head of liquid is more than 5 times the height of orifice |
| D. | he available head of liquid is less than 5 times the height of orifice |
| Answer» E. | |
| 80. |
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit speed of the wheel is |
| A. | 0 r.p.m. |
| B. | 0 r.p.m. |
| C. | 0 r.p.m. |
| D. | 0 r.p.m. |
| Answer» C. 0 r.p.m. | |
| 81. |
A flow whose streamline is represented by a straight line, is called __________ dimensional flow. |
| A. | ne |
| B. | wo |
| C. | hree |
| D. | our |
| Answer» B. wo | |
| 82. |
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe) |
| A. | lv²/2gd |
| B. | lv²/gd |
| C. | flv²/2gd |
| D. | flv²/2gd |
| Answer» E. | |
| 83. |
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet) |
| A. | 1 + cos φ)/2 |
| B. | 1 - cos φ)/2 |
| C. | 1 + sin φ)/2 |
| D. | 1 - sin φ)/2 |
| Answer» B. 1 - cos φ)/2 | |
| 84. |
Bulk modulus of a fluid is the ratio of |
| A. | hear stress to shear strain |
| B. | ncrease in volume to the viscosity of fluid |
| C. | ncrease in pressure to the volumetric strain |
| D. | ritical velocity to the viscosity of fluid |
| Answer» D. ritical velocity to the viscosity of fluid | |
| 85. |
The ratio of the inertia force to the __________ is called Euler's number. |
| A. | ressure force |
| B. | lastic force |
| C. | urface tension force |
| D. | iscous force |
| Answer» B. lastic force | |
| 86. |
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is |
| A. | 4π R1/2/15Cd × a √(2g) |
| B. | 4π R3/2/15Cd × a √(2g) |
| C. | 4π R5/2/15Cd × a √(2g) |
| D. | 4π R7/2/15Cd × a √(2g) |
| Answer» D. 4π R7/2/15Cd × a √(2g) | |
| 87. |
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is |
| A. | 4.8 r.p.m. |
| B. | 8.2 r.p.m |
| C. | 2.4 r.p.m. |
| D. | 48 r.p.m |
| Answer» D. 48 r.p.m | |
| 88. |
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be |
| A. | inimum |
| B. | aximum |
| C. | ero |
| D. | ould be any value |
| Answer» E. | |
| 89. |
A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called |
| A. | ascal’s law |
| B. | rchimedes’s principle |
| C. | -Alembert’s principle |
| D. | one of these |
| Answer» D. one of these | |
| 90. |
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called |
| A. | ewton's law of motion |
| B. | ewton's law of cooling |
| C. | ewton's law of viscosity |
| D. | ewton's law of resistance |
| Answer» E. | |
| 91. |
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called |
| A. | ontinuity equation |
| B. | ernoulli’s equation |
| C. | ascal’s law |
| D. | rchimedes’s principle |
| Answer» C. ascal’s law | |
| 92. |
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called |
| A. | ascal’s law |
| B. | rchimedes’s principle |
| C. | rinciple of flotation |
| D. | ernoulli’s theorem |
| Answer» C. rinciple of flotation | |
| 93. |
The rise of liquid along the walls of a revolving cylinder about the initial level is _________ the depression of the liquid at the axis of rotation. |
| A. | ame as |
| B. | ess than |
| C. | ore than |
| D. | one of these |
| Answer» B. ess than | |
| 94. |
Newton's law of viscosity is a relationship between |
| A. | ressure, velocity and temperature |
| B. | hear stress and rate of shear strain |
| C. | hear stress and velocity |
| D. | ate of shear strain and temperature |
| Answer» C. hear stress and velocity | |
| 95. |
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if |
| A. | ength of both the pipes is same |
| B. | iameter of both the pipes is same |
| C. | oss of head and discharge of both the pipes is same |
| D. | oss of head and velocity of flow in both the pipes is same |
| Answer» D. oss of head and velocity of flow in both the pipes is same | |
| 96. |
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel. |
| A. | .34 times |
| B. | .67 times |
| C. | .81 times |
| D. | .95 times |
| Answer» D. .95 times | |
| 97. |
The Francis formula for the discharge over Cipoletti weir is |
| A. | .84 LH1/2 |
| B. | .84 LH |
| C. | .84 LH3/2 |
| D. | .84 LH5/2 |
| Answer» D. .84 LH5/2 | |
| 98. |
The gross or total head of the turbine is the ___________ of the water levels at the head race and tail race. |
| A. | um |
| B. | ifference |
| C. | roduct |
| D. | one of these |
| Answer» C. roduct | |
| 99. |
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to |
| A. | alf the depth |
| B. | alf the breadth |
| C. | wice the depth |
| D. | wice the breadth |
| Answer» B. alf the breadth | |
| 100. |
The ratio of the inertia force to the elastic force is called |
| A. | eynold's number |
| B. | roude's number |
| C. | eber's number |
| D. | ach number |
| Answer» E. | |