Exam Details
| Subject | hydraulic machines | |
| Paper | ||
| Exam / Course | b.tech | |
| Department | ||
| Organization | Vardhaman College Of Engineering | |
| Position | ||
| Exam Date | May, 2018 | |
| City, State | telangana, hyderabad |
Question Paper
Hall Ticket No:
Question Paper Code: A3316
VARDHAMAN COLLEGE OF ENGINEERING
(AUTONOMOUS) B. Tech IV Semester Regular/Supplementary Examinations, May 2018
(Regulations: VCE-R15) HYDRAULIC MACHINES
(Mechanical Engineering) Date: 08 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Derive an expression for the force exerted by a jet on stationary inclined flat plate.
7M
A jet of water of diameter 10cm strikes a flat plate normally with a velocity of 15m/s. The plate moving with a velocity of 6m/s in the direction of the jet and away from the jet. Find:
i. The force exerted by the jet on the plate
ii. Work done by the jet on the plate per second
iii. Find the power
iv. Efficiency of the jet
8M
2.
Obtain an expression for the force exerted by a jet of water on a series of flat vanes on a wheel.
7M
A jet of water of diameter 50mm strikes a fixed plate in such a way that the angle between the plate and the jet is 30°. The force exerted in the direction of the jet is 1471.5N. Determine the rate of flow of water.
8M
Unit II
3.
What is a draft-tube? Why is it used in a reaction turbine? Describe with a neat sketch two different types of draft tube
8M
Explain the classification of Hydraulic Turbines briefly.
7M
4.
Draw a neat sketch of Kaplan turbine and explain its parts.
7M
A pelton wheel is having a mean bucket diameter of 1m and is running at 1000rpm. The net head on the pelton wheel is 700m. If the side clearance angle is 15° and discharge through nozzle is 0.1m³/s, find the power available at the nozzle and hydraulic efficiency of the turbine.
8M
Unit III
5.
Obtain the expression for effect of the acceleration in suction pipe on the pressure head in the cylinder.
7M
What is Cavitation? Explain its effects on performance of turbines.
8M
6.
Explain the main parts of a reciprocating pump with a neat sketch.
8M
A single-acting reciprocating pump, running at 50rpm and delivers 0.01m³/s of water. The diameter of the piston is 200mm and stroke length 400mm. Determine the theoretical discharge and coefficient of discharge of the pump.
7M
Unit IV
7.
Differentiate between the volute casing and vortex casing for the centrifugal pump.
6M
The internal and external diameters of the impellar of a centrifugal pump are 200mm and 400mm respectively. The pump is running at 1200rpm. The vane angles of the impeller at inlet and outlet are 200 and 300 respectively. The water enters the impellar radially and velocity of flow is constant. Determine the work done by the impellar per unit weight of water.
9M
Cont…2
2
8.
Obtain an expression for the minimum speed for starting a centrifugal pump.
7M
A centrifugal pump delivers water against a net head of 14.5meters and a design speed of 1000rpm. The vanes are curved back to an angle of 300 with the periphery. The diameter of impellar is 300mm and outlet width is 50mm. Determine the discharged of the pump if manometric efficiency is 95%.
8M
Unit V
9.
Explain the principle and working of hydraulic press with a neat sketch.
8M
A hydraulic press has a ram of 200mm diameter and plunger of 30mm diameter, It is used for lifting a weight of 3KN. Find the force required at the plunger.
7M
10.
With a neat sketch explain the following:
i. Hydraulic torque converter
ii. Air lift pump
8M
With the help of a neat sketch, explain the principle and working of the hydraulic crane.
7M
Question Paper Code: A3316
VARDHAMAN COLLEGE OF ENGINEERING
(AUTONOMOUS) B. Tech IV Semester Regular/Supplementary Examinations, May 2018
(Regulations: VCE-R15) HYDRAULIC MACHINES
(Mechanical Engineering) Date: 08 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Derive an expression for the force exerted by a jet on stationary inclined flat plate.
7M
A jet of water of diameter 10cm strikes a flat plate normally with a velocity of 15m/s. The plate moving with a velocity of 6m/s in the direction of the jet and away from the jet. Find:
i. The force exerted by the jet on the plate
ii. Work done by the jet on the plate per second
iii. Find the power
iv. Efficiency of the jet
8M
2.
Obtain an expression for the force exerted by a jet of water on a series of flat vanes on a wheel.
7M
A jet of water of diameter 50mm strikes a fixed plate in such a way that the angle between the plate and the jet is 30°. The force exerted in the direction of the jet is 1471.5N. Determine the rate of flow of water.
8M
Unit II
3.
What is a draft-tube? Why is it used in a reaction turbine? Describe with a neat sketch two different types of draft tube
8M
Explain the classification of Hydraulic Turbines briefly.
7M
4.
Draw a neat sketch of Kaplan turbine and explain its parts.
7M
A pelton wheel is having a mean bucket diameter of 1m and is running at 1000rpm. The net head on the pelton wheel is 700m. If the side clearance angle is 15° and discharge through nozzle is 0.1m³/s, find the power available at the nozzle and hydraulic efficiency of the turbine.
8M
Unit III
5.
Obtain the expression for effect of the acceleration in suction pipe on the pressure head in the cylinder.
7M
What is Cavitation? Explain its effects on performance of turbines.
8M
6.
Explain the main parts of a reciprocating pump with a neat sketch.
8M
A single-acting reciprocating pump, running at 50rpm and delivers 0.01m³/s of water. The diameter of the piston is 200mm and stroke length 400mm. Determine the theoretical discharge and coefficient of discharge of the pump.
7M
Unit IV
7.
Differentiate between the volute casing and vortex casing for the centrifugal pump.
6M
The internal and external diameters of the impellar of a centrifugal pump are 200mm and 400mm respectively. The pump is running at 1200rpm. The vane angles of the impeller at inlet and outlet are 200 and 300 respectively. The water enters the impellar radially and velocity of flow is constant. Determine the work done by the impellar per unit weight of water.
9M
Cont…2
2
8.
Obtain an expression for the minimum speed for starting a centrifugal pump.
7M
A centrifugal pump delivers water against a net head of 14.5meters and a design speed of 1000rpm. The vanes are curved back to an angle of 300 with the periphery. The diameter of impellar is 300mm and outlet width is 50mm. Determine the discharged of the pump if manometric efficiency is 95%.
8M
Unit V
9.
Explain the principle and working of hydraulic press with a neat sketch.
8M
A hydraulic press has a ram of 200mm diameter and plunger of 30mm diameter, It is used for lifting a weight of 3KN. Find the force required at the plunger.
7M
10.
With a neat sketch explain the following:
i. Hydraulic torque converter
ii. Air lift pump
8M
With the help of a neat sketch, explain the principle and working of the hydraulic crane.
7M
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