Subject Code: ME404PC

DEPARTMENT OF MECHANICAL ENGINEERINGII Year B. Tech., II -Sem.

Subject: FLUID MECHANICS AND HYDRAULIC MACHINESNote: - All Questions are mapped with Blooms Taxonomy Levels and Course Outcomes.

UNIT-I2-MARKS QUESTIONS

S.No. Questions Skills CO P.I

1If the surface tension at air-water interface is 0.069 N/m, what is the pressure difference between inside and outside of an air bubble of diameter 0.009 mm?

evaluate C224.11.4.1

2

Assuming that the interstices in a clay are of size equal to one tenth the mean diameter of the grain, estimate the height to which water will rise in a clay soil of average grain diameter of 0.048 mm. Assume surface tension at air-water interface as 0.074 N/m

evaluate C224.11.4.1

3 Define “Compressibility” and “Bulk Modulus”? remember C224.1 1.4.1

4 Find the depth of a point below water surface in sea where the pressure intensity is 100.55 kN/m2. Specific gravity of sea water is 1.025? evaluate C224.1 1.4.1

5A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. Find the force required on the punger?

evaluate C224.11.4.1

3-MARKS QUESTIONSS.No. Questions Skills CO P.I

1 Differentiate between U-tube differential manometer and inverted U-tube differential manometer? understand C224.1 1.4.1

2 Derive dimensions for dynamic viscosity and kinematic viscosity? analysis C224.1 1.3.1

3 Define Viscosity. How it varies with temperature? remember C224.1

4The relative density of a fluid is 1.26 and its dynamic viscosity is 1.5 Pa.s. Calculate its: i) Specific Weight ii) Kinematic viscosity.

evaluate C224.11.4.1

5 Define cavitation, vapour pressure, capillarity? remember C224.1 1.4.1

5-MARKS QUESTIONSS.No. Questions Skills CO P.I

1 A 90 mm diameter shaft rotates at 1200 rpm in a 100 mm long journal bearing of 90.5 mm internal diameter. The annular space in the bearing filled with oil having a dynamic viscosity of 0.12 Pa.s. Estimate the power dissipated as heat?

evaluate C224.11.4.1

2 A plate having an area of 0.7 m2 is sliding down the inclined plane at 450 to the horizontal with a velocity of 0.45 m/s. there is a cushion of fluid 2 mm thick between the plane and the plate. Find the viscosity of the fluid if the weight of the plate is 300N?

evaluate C224.11.4.1

3 In a mercury differential manometer the mercury deflection is 20 cm. Find the difference of pressure in ‘kpa’ if the liquid flowing in the pipe is oil of sp. gr. 0.8?

evaluate C224.11.4.1

4 A plate 0.05 mm distant from a fixed plate moves at 1.2 m/s and requires a force of 2.2 N/m2 to maintain this speed. Find the viscosity

evaluate C224.1 1.4.1

of the fluid between the plates?5 A differential manometer connected at the two points A and B in a

pipe containing an oil of specific gravity of 0.9 shows a difference in mercury levels as 150 mm. Find the difference in pressures at the two points?

evaluate C224.11.4.1

Subject Code: ME404PC

DEPARTMENT OF MECHANICAL ENGINEERINGII Year B. Tech., II -Sem.

Subject: FLUID MECHANICS AND HYDRAULIC MACHINESNote: - All Questions are mapped with Blooms Taxonomy Levels and Course Outcomes.

UNIT-II2-MARKS QUESTIONS

S.No. Questions Skills CO P.I

1Name the different forces present in a fluid flow. For the Euler’s equation of motion, which forces are taken into consideration?

understand C224.2

1.4.1

2 What is meant by surface and body forces? remember C224.2 1.4.1

3 What is continuity equation? Give the applications? understand C224.2 1.4.1

4Define stream length and stream tube with neat sketch?

remember C224.21.4.1

5 Define rate of flow, units and dimensions? remember C224.2 1.4.1

3-MARKS QUESTIONSS.No. Questions Skills CO P.I

1 Explain the working principle of Orifice meter? understand C224.2 1.4.1

2Derive Bernoulli’s equation through Euler’s equation of motion?

analysis C224.21.3.1

3 State the momentum equation? remember C224.2 1.4.1

4 Derive continuity equation? evaluate C224.2 1.3.1

5 Define and write the equation of stream line? remember C224.2 1.4.1

5-MARKS QUESTIONSS.No. Questions Skills CO P.I

1 Water is flowing through a pipe having diameters 600 mm and 400 mm at the bottom and upper end respectively. The intensity of pressure at the bottom end is 350 kN/m2 and the pressure at the upper end is 100 kN/m2. Determine the difference in datum head if the rate of flow through the pipe is 60 litres/s?

evaluate C224.2

1.4.1

2 A 40 cm diameter pipe, conveying water, branches into two pipes of diameter 30 cm and 20 cm respectively. If the average velocity in the 40 cm diameter pipe is 3 m/s. Find the discharge in this pipe. Also, determine the velocity in 20 cm pipe if the average velocity in 30 cm diameter pipe is 2m/sec?

evaluate C224.2

1.4.1

3 Water flows through a pipe AB 1.2 m diameter at 3 evaluate C224.2 1.4.1

m/s and then passes through a pipe BC 14.5 m dimeter. At C, the pipe branches. Branch CD is 0.8 m in diameter and carries one-third of the flow in AB. The flow velocity in branch CE is 2.5 m/s. find the volume rate of flow in AB, the velocity in BC, the velocity in CD and the diameter of CE?

4 The diameters of a pipe at the sections 1-1and 2-2 are 200 mm and 300 mm respectively. If the velocity of water flowing through the pipe at section 1-1 is 4m/s, find:

(i) Discharge through the pipe, and(ii) Velocity of water at section 2-2

evaluate C224.2

1.4.1

5 Derive equation of continuity for 3D flow? analysis C224.2 1.3.1

Subject Code: ME404PC

DEPARTMENT OF MECHANICAL ENGINEERINGII Year B. Tech., II-Sem.

Subject: FLUID MECHANICS AND HYDRAULIC MACHINESNote: - All Questions are mapped with Blooms Taxonomy Levels and Course Outcomes.

UNIT-III2-MARKS QUESTIONS

S.No. Questions Skills CO P.I1 Define boundary layer and boundary layer thickness remember C224.3 1.4.1

2 Discuss how you measure the pressure between two different points using differential manometer? understand C224.3 1.4.1

3 Define Hydraulic gradient line and Total energy line remember C224.3 1.4.1

3-MARKS QUESTIONSS.No. Questions Skills CO P.I

1 Explain in detail laminar boundary layer, turbulent boundary layer, laminar sub-layer? understand C224.3 1.4.1

2 What are the practical applications of Bernoulli’s equation? understand C224.3 1.4.1

3 Explain the difference between simple and differential manometer? understand C224.3 1.4.1

5-MARKS QUESTIONSS.No. Questions Skills CO P.I

1 Explain with sketches the three methods of boundary layer control? understand C224.3 1.4.1

2 The diameters of ram and plunger of an hydraulic press are 200 mm and 30 mm respectively. Find the weight lifted by the hydraulic press when the force applied at the plunger is400 N..

evaluate C224.3

1.4.1

3 Explain the terms: (i) Path line (ii) Streak line (iii) Stream line and (iv) Stream tube understand C224.3 1.4.1