4020410-FLUID MECHANICS AND FLUID POWER
IV-Semester Mechanical Engineering (N-Scheme)
IMPORTANT 3 MARKS QUESTIONS
UNIT-I
Properties of Fluids, Pressure of Fluids & Pressure Measurement
Three Marks Questions
Compare vacuum, atmospheric, gauge and absolute pressure (April 2019, February 2022)
What is the use of dead weight pressure gauge? (February 2022)
Define wetted perimeter and hydraulic radius. (February 2022, October 2018)
Explain gauge and absolute pressure. (December 2020)
State Pascal’s law and give two examples where this principle is applied. (April 2019, December 2020)
Define (a) Specific gravity (b) Cohesion. [December 2020, April 2016]
Name any four properties of a fluid and state their units. (October 2019)
Write short notes on hydraulic press. (April 2019)
A gauge records a pressure of 20kN/m2. Calculate the corresponding absolute pressure in kN/m2 and metre of water. (October 2018)
Define vacuum pressure. (October 2018)
Express 125 kN/m2 of pressure in m of water and mm of mercury. (April 2018)
What is meant by pressure head? [April 2018, October 2017, 2002]
Explain the method of measuring local atmospheric pressure. (October 2017)
What are the precautions to be followed in setting up and operation of manometer?
(October 2017)
Write shot notes on hydraulic jack (October 2018)
Explain the different types of fluids. [April 2015, October 2006]
A gauge fitted to a compressor shows a reading of 30 kN/m2. Compare the corresponding absolute pressure in (a) kN/m2 (b) in ‘m’ of water. (October 2017)
UNIT-II
FLUID FLOW, FLOW THROUGH PIPES & IMPACT OF JET
Three Marks Questions
What are the types of fluid flow
Define steady and unsteady flow of fluid with example. (October 2019)
Define uniform and non uniform flow of fluid. (April 2019)
Compare laminar flow and turbulent flow. (October 2018)
State the continuity equation of flow (October 2018, 2017)
State Bernoulli’s theorem. (October 2019, 2017)
What are the assumptions made in Bernoulli’s theorem? [April 2019, 2018, 2016, October 2013, 2007]
State any five application of Bernoulli’s theorem?
State the advantages and limitation of Bernoulli’s theorem. [April 2017, 2007, 2005]
What is a pitot tube?
Compare venturimeter and orifice meter (December 2020, April 2015,2010, 2002, 2008, October 2017, 2014, 2004, 2009)
Drive an expression for the discharge through a venturimeter
State the major and minor losses in a pipe line
State the law of fluid friction in laminar flow. (April 2017)
List out the minor losses occurred in the pipe line flow. (Or) Explain any four minor losses occurred in flow through pipes (or) fluid flow. [October 2018, 2016, 2010, 2002, April 2016, 2015]
Write down the expression for Chezy’s formula?
Define wetted perimeter
Derive the expression for force exerted by the jet on a stationary plate held normal to the direction of jet. (February 2022)
Derive an expression for the force exerted and work done by the jet on a series of moving plates. (April 2019, October 2018, 2017)
Define the following :- (i) Co-efficient of contraction. (ii) Co-efficient of velocity. (iii) Co-efficient of discharge. (Or) Define Cp, Cv and Cd. [April 2019, February 2022, October 2002]
What is an impact of jet? State its applications. [December 2020, February 2022, October 2006]
Define the term impact of jet. (October 2019)
Water flows with a velocity of 5m/sec in a pipe of 1m diameter and 1km long. Find Chezy’s constant, if the loss of head due to friction is 10m of water. (April 2018)
Using chezy’s formula, find the loss of head due to friction in a circular pipe 30m long and 75mm diameter when the velocity of flow is 1.8m/sec. take C=100. (April 2015, 2006, October 2016)
Using chezy’s formula, determine the head lost due to friction in a pipe of 80mm diameter and 35m length. The velocity of low is 2 m/s and C=100. (October 2017)
A jet of water 0.25m diameter is moving with a velocity of 30m/sec. find the force exerted by the jet on affixed plate held normal to the jet. (April 2018)
Define the hydraulic co-efficient. State the relation between them. [April 2007, October 2018, 2017, 2004]
UNIT-III
HYDRAULIC TURBINES, CENTRIFUGAL PUMPS & RECIPROCATING PUMPS
Three Marks Questions
Classification of turbines.
List out the various types of draft tubes, and explain any one. (February 2022)
What are the surge tanks? Name different types of surge tank. [December 2020, October 2019, 2007, 2006, 2002]
Write any two differences of Francis and Kaplan turbines. (April 2019, October 2017)
How the centrifugal pumps are classified? [October 2013, April 2006]
Name the different types of castings used in centrifugal pumps. (February 2022)
What are the different types of impellers used in centrifugal pumps? (October 2017)
What is meant by Priming? Why is it necessary? [October 2019, 2007, 2005, 2004]
What is meant cavitations? (April 2018)
What is an air vessel? What are its functions? [December 2020, April 2019, 2006]
Differentiate plunger and piston pumps. (April 2019)
Define co efficient of discharge
What is slip and negative slip of a reciprocating pump? (October 2018)
Compare between plunger pump and piston pump. (Or) What are the difference between plunger pump and piston pump? [April 2018, 2017, 2007, 2006, October 2002]
Write down the formula to find the theoretical discharge of a double acting reciprocating pump. (October 2017)
Explain the need of air vessel in a reciprocating pump. [April 2017, 2007]
Three Marks Questions
UNIT-IV
Hydraulics Systems
What are the various elements of hydraulic systems? [February 2022, October 2018]
Mention any three qualities of a good hydraulic fluid. [February 2022, April 2011, 2010, 2005, October 2017]
Name any three types of hydraulic pumps?
Name few positive displacement pumps.
What is an accumulators and types of accumulators? [April 2014]
What is meant by hydraulic actuator?
What is the function of accumulator? (October 2019, December 2020)
Explain the working of any one types of accumulator. (April 2019)
Draw a spring loaded type accumulator and mark the parts. [October 2016, April 2015]
What is the function of check valve? (October 2019)
Compare pneumatic system with hydraulic system. (October 2006, 2007, 2008, 2011, 2012, 2014, April 2019, 2017, 2016, 2015, 2009)
Differentiate metering-in and metering-out circuits. (April 2019)
List few machines using hydraulic intensifiers. (April 2018)
State the functions of pressure intensifier. [October 2011]
List out the elements of hydraulic system with a line diagram. (October 2017)
State any three Merits and demerits of hydraulic systems. (October 2017)
Explain any two service properties of hydraulic fluids. [October 2015, 2010, April 2015, 2014]
What is hydraulic motor? Explain. (October 2018)
Write any four requirements of good hydraulic fluid. (April 2009, October 2013, 2015)
Three Marks Questions
UNIT-V
PNEUMATIC SYSTEMS
What are the main components of pneumatic system? (Feb 2022)
What are the uses of compressed air?
Classify air compressors
Draw the ISO symbol of FRL unit (Feb 2022)
Draw the ISO symbol of 3/2 and 5/2 DCV.
Explain the working of 5/2 DCV with neat sketch. (Dec 2020)
What is cracking pressure of valve? (oct 19 , Dec2020)
Explain the working of shuttle valve with neat sketch. [April 2019,.2006, 2005, October 2017, 2009, 2004]
State any five merits and any five applications of pneumatic system (October 2016, 2010, April 2019, 2012, 2006, 2014)
What is throttle valve? (October 2019)
Write shot notes on Air service unit (FRL unit) [April 2019, 2009, 2007, October 2017]
Explain the elements of pneumatic system. [April 2019, 2015, 2007, October 2007]
Draw the ISO symbol of quick exhaust valve. (October 2018)
What is meant by 3/2 DCV? (October 2018, 2017)
Explain the quick exhaust valve. [April 2018, 2010, October 2002]
What is the use of quick exhaust valve? (April 2018)
Explain the working of a pressure regulator.(October 2017)
Explain the working of lubricator with a neat sketch. [October 2014]
Explain the working of a check valve in Pneumatic system. [April 2012]
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