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Name: Fluid Machines & Hydraulic Machine mcq question answer
Subject: Fluid Machines & Hydraulic Machine
Time Allowed: 10 Minutes
Important for: Chemical Engineering, Civil Engineering and Mechanical Engineering B. tech / M Tech., GATE, IES and Job interviews.
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- Question 1 of 10
1. Question1 points
Assertion: The effect of surface tension is to reduce the surface of a free body of liquid to a minimum.
Reason: To expand the surface area of the free body of the liquid, molecules have to be brought to the surface from the bulk of the liquid and in this process work is done against the attraction between the molecules.CorrectIncorrectUnattempted
- Question 2 of 10
2. Question1 points
Assertion: Absolute pressure intensity cannot be measured directly.
Reason: All instruments said to measure it only indicate a difference in pressure, with reference to the surrounding atmosphere.CorrectIncorrectUnattempted
- Question 3 of 10
3. Question1 points
Assertion: When a floating vessel tilts, the centre of buoyancy shifts transversely.
Reason: The equilibrium between the weight of the body and upthrust is stable.CorrectIncorrectUnattempted
- Question 4 of 10
4. Question1 points
Assertion: Boundary layer theory is applicable only in the vicinity of the leading edge of a flat plate.
Reason: Boundary layer theory is based on the assumption that its thickness is small when compared to other linear dimension.CorrectIncorrectUnattempted
- Question 5 of 10
5. Question1 points
Assertion: Inverted U-tube manometers are preferred in the measurement of low pressure differences.
Reason: The manometer fluid used is heavier than the working fluids.CorrectIncorrectUnattempted
- Question 6 of 10
6. Question1 points
Assertion: A minor change in specific energy at or close to critical state will cause a major change in depth.
Reason: A critical state of flow its characterized by its Froude number being equal to unity.CorrectIncorrectUnattempted
- Question 7 of 10
7. Question1 points
Assertion: The movement of two blocks of wood wetted with hot glue requires greater and greater effort as the glue is drying up.
Reason: Viscosity of liquids varies inversely with temperature.CorrectIncorrectUnattempted
- Question 8 of 10
8. Question1 points
Assertion: There is no flow in the direction perpendicular to a stream line at any point on it.
Reason: Stream line consists of a number of infinitesimally small segments, such that all of them lie along the directions of velocity vectors of fluid particles at those segments.CorrectIncorrectUnattempted
- Question 9 of 10
9. Question1 points
Assertion: At transition to turbulence, the boundary layer thickness increase at a rapid rate.
Reason: Friction at the boundary increase after transition.CorrectIncorrectUnattempted
- Question 10 of 10
10. Question1 points
Assertion: Sometimes air is injected into the flow in order to prevent cavitation damage.
Reason: Air bubbles prevent the formation of the vapour bubbles of the flowing liquid.CorrectIncorrectUnattempted