Engineering :: Fluid Mechanics and Hydraulic Machines
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51. |
A hydrometer is used to determine |
A. |
Relative humidity |
B. |
Buoyancy force |
C. |
Specific gravity of liquids |
D. |
Viscosity of liquids |
E. |
Surface tension |
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Answer: Option C
Explanation:
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52. |
In isentropic flow, the temperature |
A. |
Cannot exceed the reservoir temperature |
B. |
Cannot drop and then increase again downstream |
C. |
Is independent of Mach number |
D. |
Is a function of Mach number only |
E. |
Remains constant in a duct flow |
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Answer: Option A
Explanation:
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53. |
In an isothermal atmosphere |
A. |
Pressure decreases linearly with elevation |
B. |
Pressure is constant all over |
C. |
Pressure varies in the same way as density |
D. |
Pressure increases directly as the square of height |
E. |
Pressure varies exponentially with density |
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Answer: Option C
Explanation:
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54. |
The dynamic viscosity of most of the gases with rise in gas temperature |
A. |
Increases |
B. |
Increases as ?T |
C. |
Increses inversely as ?T |
D. |
Decreases |
E. |
Does not change significantly |
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Answer: Option A
Explanation:
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55. |
The flow of water in a pipe of diameter 3000 mm can be measured by |
A. |
Venturimeter |
B. |
Rotameter |
C. |
Nozzle |
D. |
Pitot tube |
E. |
Orifice plate |
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Answer: Option D
Explanation:
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56. |
A fluid is a substance that |
A. |
Always expands until it fills any container |
B. |
Has the same shear stress at a point regardless of its motion |
C. |
Cannot remain at rest under action of any sher force |
D. |
Cannot be subjected to shear forces |
E. |
Is practically incompressible |
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Answer: Option B
Explanation:
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57. |
The resultant hydrostatic force acts through a point known as |
A. |
Centre of gravity |
B. |
Centre of buoyancy |
C. |
Centre of Pressure |
D. |
None of the above |
Answer: Option C
Explanation:
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58. |
The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to |
A. |
Density of the fluid |
B. |
Specific weight of the fluid |
C. |
Weight of the fluid |
D. |
None of the above |
Answer: Option B
Explanation:
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59. |
An ideal fluid is |
A. |
Very viscous |
B. |
One which obeys Newton's law of viscosity |
C. |
A useful assumption in problems in conduit flow |
D. |
Frictionless and incompressible |
E. |
None of these answers |
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Answer: Option D
Explanation:
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60. |
An ideal flow of any liquid must fulfil |
A. |
Newton's second law of motion |
B. |
Bernulli's theorem |
C. |
The Newton's law of viscosity |
D. |
Law of conservation of energy |
E. |
Countinuity equation |
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Answer: Option E
Explanation:
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