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MCQOPTIONS
This section includes 832 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A floating body is said to be in a state of stable equilibrium |
| A. | when its metacentric height is zero |
| B. | when the metacentre is above the centre of gravity |
| C. | when the metacentre is below the centre of gravity |
| D. | only when its centre of gravity is below its centre of buoyancy |
| Answer» C. when the metacentre is below the centre of gravity | |
| 52. |
A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is |
| A. | 5kN |
| B. | lOkN |
| C. | 15 kN |
| D. | 20 kN |
| Answer» C. 15 kN | |
| 53. |
A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is |
| A. | 9,000 kg |
| B. | 13,500 kg |
| C. | 18,000 kg |
| D. | 27,000 kg |
| Answer» C. 18,000 kg | |
| 54. |
The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will |
| A. | increase |
| B. | remain unaffected |
| C. | may increase or decrease depending on the characteristics of liquid |
| D. | decrease |
| Answer» E. | |
| 55. |
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is |
| A. | slightly less |
| B. | slightly more |
| C. | nearly half |
| D. | equal |
| Answer» B. slightly more | |
| 56. |
Differential monometer is used to measure |
| A. | pressure in pipes, channels etc |
| B. | atmospheric pressure |
| C. | very low pressure |
| D. | difference of pressure between two points |
| Answer» E. | |
| 57. |
The pitot tube is used to measure |
| A. | velocity at stagnation point |
| B. | stagnation pressure |
| C. | static pressure |
| D. | dynamic pressure |
| Answer» C. static pressure | |
| 58. |
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ? |
| A. | 0.5 |
| B. | 0.4 |
| C. | 0.515 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 59. |
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe) |
| A. | 0.223 R |
| B. | 0.423 R |
| C. | 0.577 R |
| D. | 0.707 R |
| Answer» B. 0.423 R | |
| 60. |
Which of the following is demensionless |
| A. | specific weight |
| B. | specific volume |
| C. | specific speed |
| D. | specific gravity |
| Answer» E. | |
| 61. |
When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies |
| A. | linearly with radial distance |
| B. | as the square of the radial distance |
| C. | inversely as the square of the radial distance |
| D. | inversely as the radial distance |
| Answer» C. inversely as the square of the radial distance | |
| 62. |
According to Bernoulli’s equation for steady ideal fluid flow |
| A. | principle of conservation of mass holds |
| B. | velocity and pressure are inversely proportional |
| C. | total energy is constant throughout |
| D. | the energy is constant along a stream-line but may vary across streamlines |
| Answer» E. | |
| 63. |
The velocity of jet of water travelling out of opening in a tank filled with water is proportional to |
| A. | head of water (h) |
| B. | h2 |
| C. | V/T |
| D. | h2 |
| Answer» D. h2 | |
| 64. |
The speed of sound in a ideal gas varies directly as its |
| A. | absolute temperature |
| B. | temperature |
| C. | density |
| D. | modulus of elasticity |
| Answer» B. temperature | |
| 65. |
Which of the following is an incorrect statement ? |
| A. | Coefficient of contraction of a venturimeter is unity |
| B. | Flow nozzle is cheaper than venturimeter but has higher energy loss |
| C. | Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined |
| D. | None of the above statement is correct |
| Answer» E. | |
| 66. |
Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem |
| A. | Venturimeter |
| B. | Orifice plate |
| C. | pitot tube |
| D. | all of the above |
| Answer» E. | |
| 67. |
Units of surface tension are |
| A. | energy/unit area |
| B. | distance |
| C. | both of the above |
| D. | it has no units |
| Answer» D. it has no units | |
| 68. |
If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is |
| A. | 1 |
| B. | 4/3 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 69. |
The value of mass density in kgsecVm4 for water at 0°C is |
| A. | 1 |
| B. | 1000 |
| C. | 100 |
| D. | 101.9 |
| Answer» E. | |
| 70. |
The speed of a pressure wave through a pipe depends upon |
| A. | the length of pipe |
| B. | the viscosity of fluid |
| C. | the bulk modulus for the fluid |
| D. | the original head |
| Answer» D. the original head | |
| 71. |
The maximum thickness of boundary layer in a pipe of radius r is |
| A. | 0 |
| B. | r/2 |
| C. | r |
| D. | 2r |
| Answer» D. 2r | |
| 72. |
The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is |
| A. | 2.4 m |
| B. | 3.0 m |
| C. | 4.0 m |
| D. | 2.5 m |
| Answer» C. 4.0 m | |
| 73. |
For pipes, laminar flow occurs when Roynolds number is |
| A. | less than 2000 |
| B. | between 2000 and 4000 |
| C. | more than 4000 |
| D. | less than 4000 |
| Answer» B. between 2000 and 4000 | |
| 74. |
Size of a venturimeter is specified by |
| A. | pipe diameter |
| B. | throat diameter |
| C. | angle of diverging section |
| D. | both pipe diameter as well as throat diameter |
| Answer» E. | |
| 75. |
When the velocity distribution is uniform over the cross-section, the correction factor for momentum is |
| A. | 0 |
| B. | 1 |
| C. | 4/3 |
| D. | 2 |
| Answer» C. 4/3 | |
| 76. |
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea |
| A. | Venturimeter |
| B. | hot wire anemometer |
| C. | rotameter |
| D. | pitot tube |
| Answer» E. | |
| 77. |
The losses are more in |
| A. | laminar flow |
| B. | transition flow |
| C. | turbulent flow |
| D. | critical flow |
| Answer» D. critical flow | |
| 78. |
In case of an airfoil, the separation of flow occurs |
| A. | at the extreme rear of body |
| B. | at the extreme front of body |
| C. | midway between rear and front of body |
| D. | any where between rear and front of body depending upon Reynolds number |
| Answer» B. at the extreme front of body | |
| 79. |
Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is |
| A. | less than d |
| B. | between d and 1.5 d |
| C. | between 1.5 d and 2d |
| D. | greater than 2d |
| Answer» B. between d and 1.5 d | |
| 80. |
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is |
| A. | L/4 |
| B. | L/3 |
| C. | L/2 |
| D. | L |
| Answer» B. L/3 | |
| 81. |
In steady flow of a fluid, the total accele ration of any fluid particle |
| A. | can be zero |
| B. | is never zero |
| C. | is always zero |
| D. | is independent of coordinates |
| Answer» B. is never zero | |
| 82. |
A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, theni) the ball will move to the frontii) the bubble will move to the frontiii) the ball will move to the reariv) the bubble will move to the rearFind out which of the above statements are correct ? |
| A. | (i) and (ii) |
| B. | (i) and (iv) |
| C. | (ii) and (iii) |
| D. | (iii) and (iv) |
| Answer» C. (ii) and (iii) | |
| 83. |
Stanton diagram is a |
| A. | log-log plot of friction factor against Reynolds number |
| B. | log-log plot of relative roughness against Reynolds number |
| C. | semi-log plot of friction factor against Reynolds number |
| D. | semi-log plot of friction factor against relative roughness |
| Answer» B. log-log plot of relative roughness against Reynolds number | |
| 84. |
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is |
| A. | zero |
| B. | one-fourth its value when cylinder was full |
| C. | one-half its value when cylinder was full |
| D. | cannot be predicted from the given data |
| Answer» B. one-fourth its value when cylinder was full | |
| 85. |
Which of the following has highest coefficient of discharge ? |
| A. | sharp edged orifice |
| B. | venturimeter |
| C. | Borda’s mouthpiece running full |
| D. | CipoUetti weir |
| Answer» C. Borda’s mouthpiece running full | |
| 86. |
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is |
| A. | 1/3 |
| B. | 1/4 |
| C. | 1/2 |
| D. | 2/3 |
| Answer» B. 1/4 | |
| 87. |
Two dimensional flow occurs when |
| A. | the direction and magnitude of the velocity at all points are identical |
| B. | the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time |
| C. | the magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane |
| Answer» E. | |
| 88. |
Separation of flow occurs when |
| A. | the pressure intensity reaches a minimum |
| B. | the cross-section of a channel is reduced |
| C. | the boundary layer comes to rest |
| D. | all of the above |
| Answer» D. all of the above | |
| 89. |
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be |
| A. | 4 kN/m2 |
| B. | 10 kN/m2 |
| C. | 12 kN/m2 |
| D. | 14 kN/m2 |
| Answer» E. | |
| 90. |
If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is |
| A. | 0.25 |
| B. | 0.50 |
| C. | 1.0 |
| D. | none of the above |
| Answer» D. none of the above | |
| 91. |
Which of the following is the unit of kinematic viscosity |
| A. | pascal |
| B. | poise |
| C. | stoke |
| D. | faraday |
| Answer» D. faraday | |
| 92. |
Pascal-second is the unit of |
| A. | pressure |
| B. | kinematic viscosity |
| C. | dynamic viscosity |
| D. | surface tension |
| Answer» D. surface tension | |
| 93. |
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be |
| A. | from reservoir A to reservoirs B and C |
| B. | from reservoir B to reservoirs C and A |
| C. | from reservoir C to reservoirs A and B |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 94. |
Centre of pressure compared to e.g. is |
| A. | above it |
| B. | below it |
| C. | at same point |
| D. | above or below depending on area of body |
| Answer» C. at same point | |
| 95. |
In a forced vortex motion, the velocity of flow is |
| A. | directly proportional to its radial distance from axis of rotation |
| B. | inversely proportional to its radial distance from the axis of rotation |
| C. | inversely proportional to the square of its radial distance from the axis of rotation |
| D. | directly proportional to the square of its radial distance from the axis of rotation |
| Answer» B. inversely proportional to its radial distance from the axis of rotation | |
| 96. |
The hydraulic grade line is |
| A. | always above the centre line of pipe |
| B. | never above the energy grade line |
| C. | always sloping downward in the direction of flow |
| D. | all of the above |
| Answer» C. always sloping downward in the direction of flow | |
| 97. |
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be |
| A. | 2 meters of water column |
| B. | 3 meters of water column |
| C. | 3.5 meters of water column |
| D. | 4 m of water column |
| Answer» C. 3.5 meters of water column | |
| 98. |
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be |
| A. | 2 meters of water column |
| B. | 3 meters of water column |
| C. | 5 meters of water column |
| D. | 6 meters of water Column |
| Answer» E. | |
| 99. |
With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on |
| A. | a circular disc of plate held normal to flow |
| B. | a sphere |
| C. | a cylinder |
| D. | a streamlined body |
| Answer» B. a sphere | |
| 100. |
If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is |
| A. | 4/3 |
| B. | 3/2 |
| C. | 9/4 |
| D. | 27/8 |
| Answer» D. 27/8 | |