SHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT

Transcription

1 B.Tech. [SEM VI(ME-61,62,63 & 64)] QUIZ TEST-1 Q-1). A jet strikes a smooth curved vane moving in the same direction as the jet and the jet get reversed in the direction. Show that the maximum efficiency is slightly less than 60%. ( Q.No.12) [5] Q2). A jet of water of diameter 10 cm strikes a flat plate normally with a a velocity of 15m/s. The plate is moving with the 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. (Q.No.3) [5] Q1). Draw the layout of a hydro-electric power plant using a Pelton wheel turbine and define the following:- i) Gross head ii) Net Head iii) Hydraulic Efficiency and iv) Overall efficiency of Pelton Wheel Turbine. [3+4] Q2) The shaft power of a Pelton wheel, the bucket of which are struck by two jets, is kw.the diameter of each jet is 200mm. If the net head on the turbine is 400mm, find the overall efficiency of the turbine. Take C v =1.0. [6] Q3) i) What is the purpose of governing in turbines? ii) Why the angle of deflection in Pelton wheel turbine is limited to if maximum efficiency is obtained when angle of deflection is 180? [4+3] X EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 21/02/2012

2 QUIZ TEST-1 Q1). Show that the force exerted by a jet of water on moving inclined plate in the direction of jet is given by:- F x = ρ a(v-u) 2 sin 2 θ. (Q.No.6) [2+2] Q2) A pelton wheel is to be designed for the following specification: shaft power= 11772kW; head =380meters ; speed = 750 rpm; overall efficiency =86% ; jet diameter is not to exceed one sixth of the wheel diameter. Determine: i) the wheel diameter ii) the number of jets required and iii) Diameter of jet. Take Kv 1 =0.985 and Ku 1 = (Q.No.9) [6] Q1). Draw the layout of a hydro-electric power plant using a Pelton wheel turbine and define the following:- i) Gross head ii) Net Head iii) Hydraulic Efficiency and iv) Overall efficiency of Pelton Wheel Turbine. [3+4] Q2) The shaft power of a Pelton wheel, the bucket of which are struck by two jets, is kw.the diameter of each jet is 200mm. If the net head on the turbine is 400mm, find the overall efficiency of the turbine. Take C v =1.0. [6] Q3) i) What is the purpose of governing in turbines? ii) Why the angle of deflection in Pelton wheel turbine is limited to if maximum efficiency is obtained when angle of deflection is 180? [4+3] X EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 21 /02/2010

3 QUIZ TEST-1 Q1). Derive Impulse momentum equation and discuss its significance. (Q.No.7) [2+2] Q2). A jet of water having a velocity of 40m/s strikes a curved vane which is moving with a velocity of 20m/s. The jet makes an angle of 30 o with direction of motion of vain at inlet and leaves at an angle of 90 o to the direction of motion of vain at outlet. Draw the velocity triangles at inlet and outlet and determine the vain angles at inlet and outlet so that the water enters and leaves the vain without shock. (Q.No.8) [2+4] Q1). Draw the layout of a hydro-electric power plant using a Pelton wheel turbine and define the following:- i) Gross head ii) Net Head iii) Hydraulic Efficiency and iv) Overall efficiency of Pelton Wheel Turbine. [3+4] Q2) The shaft power of a Pelton wheel, the bucket of which are struck by two jets, is kw.the diameter of each jet is 200mm. If the net head on the turbine is 400mm, find the overall efficiency of the turbine. Take C v =1.0. [6] Q3) i) What is the purpose of governing in turbines? ii) Why the angle of deflection in Pelton wheel turbine is limited to if maximum efficiency is obtained when angle of deflection is 180? [4+3] EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 21/02/2012

4 C SHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT B.Tech. [SEM VI(ME-61,62,63 & 64)] QUIZ TEST-1 Q1) Prove that for a series of radial curved vanes efficiency is given by η= 2 (V w1 u 1 ± V w2 u 2 ) / V 1 2 when jet is striking tangentially at one tip and leaving at the other. (Q.No.4) [5] Q2). A jet of water of diameter 75mm moving with a velocity of 30 m/s strikes a curved fixed plate tangentially at one end and at an angle of 30º to the horizontal. The jet leaves the plate at an angle of 20º to the horizontal. Find the force exerted by the jet on the plate in the horizontal and vertical direction. (Q.No.2) [5] Q1). Draw the layout of a hydro-electric power plant using a Pelton wheel turbine and define the following:- i) Gross head ii) Net Head iii) Hydraulic Efficiency and iv) Overall efficiency of Pelton Wheel Turbine. [3+4] Q2). The shaft power of a Pelton wheel, the bucket of which are struck by two jets, is kw.the diameter of each jet is 200mm. If the net head on the turbine is 400mm, find the overall efficiency of the turbine. Take C v =1.0. [6] Q3) i) What is the purpose of governing in turbines? ii) Why the angle of deflection in Pelton wheel turbine is limited to if maximum efficiency is obtained when angle of deflection is 180? [4+3] EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 21/02/2012

5 B.Tech. [SEM VI(ME-61,62,63 & 64)] QUIZ TEST-1 Q1). Prove that the maximum Hydraulic efficiency of Pelton wheel turbine is given by, η max = (1+cos Ф)/2 ( assuming friction factor=1) (Q.No.11) [6] Q2). Water is flowing through a pipe at the end of which a nozzle is fitted. The diameter of the nozzle is 100 mm and the head of the water at the center nozzle is 100 m. Find the force exerted by the jet of water on a fixed vertical plate. The coefficient of velocity is given as (Q.No.1) [4] Q1). Draw the layout of a hydro-electric power plant using a Pelton wheel turbine and define the following:- i) Gross head ii) Net Head iii) Hydraulic Efficiency and iv) Overall efficiency of Pelton Wheel Turbine. [3+4] Q2) The shaft power of a Pelton wheel, the bucket of which are struck by two jets, is kw.the diameter of each jet is 200mm. If the net head on the turbine is 400mm, find the overall efficiency of the turbine. Take C v =1.0. [6] Q3) i) What is the purpose of governing in turbines? ii) Why the angle of deflection in Pelton wheel turbine is limited to if maximum efficiency is obtained when angle of deflection is 180? [4+3] EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 21 /02/2012

6 QUIZ TEST-2 Q1). A reaction turbine works at 450 rpm under a head of 120m. Its diameter at inlet is 120 cm and the flow area is 0.4m2. The angles made by the absolute and relative velocity at inlet are 20 and 60 respectively with the tangential velocity. Determine: a) volume flow rate b) hydraulic efficiency. (Q.No.2) [ ] Q2) A Kaplan turbine develops kw power at an average head of 39 m. Assuming a speed ratio of 2, flow ratio of 0.6, diameter of the boss equal to 0.35 times the diameter of the runner and an overall efficiency of 90%, calculate the diameter and specific speed of the turbine. (Q.No.5) [ ] Q1) Define degree of reaction. Derive general expression of degree of reaction for Francis Turbine (Inward type). [2+5] Q2) a) Explain the purpose of providing i) Scroll casing, ii) Guide vanes & iii) draft tube for a reaction turbine. [6] b) Differentiate between Kaplan and Propeller Turbine with neat and labelled diagram. [2] Q3) The quantity of water available for a hydroelectric station is 275m 3 /s under a head of 18m. Assuming the speed of the turbines to be 150rpm, and their efficiency 82%, determine the least number of machines, all of the same size, that will be needed if i) Francis Turbines whose N s must not exceed 395, ii) Kaplan Turbines whose Ns must not exceed 690, are chosen. What would be individual output of units in the two cases? [5] X EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 12 /03/2010

7 QUIZ TEST-2 Q1) A Kaplan turbine working under a head of 20m develops kw shaft power. The outer dia of the runner is 3.5 m and the hub diameter is 1.75m. The guide blade angle at the extreme edge of the runner is 35. The hydraulic and overall efficiency of the turbine are 88% and 84% respectively. If the velocity of whirl is zero at outlet, determine:1) runner vane angle at inlet and outlet at the extreme edge of the runner and 2) speed of the turbine. (Q.No.4) [4+2] Q2) A hydro- turbine is required to give 25 MW at 50 m head and 90 r.p.m. runner speed. The laboratory facilities available, permit testing of 20KW model at 5m head. What should be the model runner speed and model to prototype scale ratio? (Q.No.7) [2+2] Q1 Define degree of reaction. Derive general expression of degree of reaction for Francis Turbine (Inward type). [2+5] Q2) a) Explain the purpose of providing i) Scroll casing, ii) Guide vanes & iii) draft tube for a reaction turbine. [6] b) Differentiate between Kaplan and Propeller Turbine with neat and labelled diagram. [2] Q3) The quantity of water available for a hydroelectric station is 275m 3 /s under a head of 18m. Assuming the speed of the turbines to be 150rpm, and their efficiency 82%, determine the least number of machines, all of the same size, that will be needed if i) Francis Turbines whose N s must not exceed 395, ii) Kaplan Turbines whose Ns must not exceed 690, are chosen. What would be individual output of units in the two cases? [5] EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 12/03/2012

8 C SHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT B.Tech. [SEM VI(ME-61,62,63 & 64)] QUIZ TEST-2 Q1) A turbine is to operate under a head of 25m at 200r.p.m. The discharge is 9m 3 /s. If the overall efficiency is 90 %, determine : i. Specific speed of the turbine ii. Type of turbine (Q.No.8) [2+2] Q2). Design a Francis turbine runner with the following data: Net head 68m Speed of the runner 750r.p.m Output 330.9kW Hydraulic efficiency 94% Overall efficiency 85% Flow ratio 0.15 Breadth ratio 0.1 Inner diameter of runner=1/2 X outer diameter. Also assume 5% of circumferential area of the runner to be occupied by the thickness of the vanes. Velocity of flow remains constant throughout and flow is radial at exit. (supplementary Q.No.6) [6] Q1 Define degree of reaction. Derive general expression of degree of reaction for Francis Turbine (Inward type). [2+5] Q2) a) Explain the purpose of providing i) Scroll casing, ii) Guide vanes & iii) Draft tube for a reaction turbine with neat and labelled diagram. [6] b) Differentiate between Kaplan and Propeller Turbine. [2] Q3) The quantity of water available for a hydroelectric station is 275m 3 /s under a head of 18m. Assuming the speed of the turbines to be 150rpm, and their efficiency 82%, determine the least number of machines, all of the same size, that will be needed if i) Francis Turbines whose N s must not exceed 395, ii) Kaplan Turbines whose Ns must not exceed 690, are chosen. What would be individual output of units in the two cases? [5] EME-011 / Ms.Ujjwala Pandey, Ms.Nidhi Singh Date: 12/03/2012

9 QUIZ TEST-3 Q1). The impeller of a centrifugal pump is of 300mm diameter and 50mm width at the periphery, and has blade whose tip angle incline backwards 60 from the radius. The pump delivers 17m3/min of water and the impeller rotates at 1000rpm. Assuming that the pump is designed to admit radially, calculate: i) Speed and direction of water as it leaves the impeller the impeller, ii) Torque exerted by the impeller on water iii) Shaft power required [mechanical efficiency=95% and hydraulic efficiency=75%] (Q.No.5) [2+2+2] Q2). It is required to pump water out of deep well under a total head of 90m. A number of identical pumps of design speed 1000rpm and specific speed 30 with a rated capacity of 0.15m 3 /s are available. How many pumps are required and how should they be connected whether in series or in parallel? (Q.No.9) [2+2] Q1). i) What are the effects of cavitation in pumps? Give the necessary precautions against cavitation. ii) Describe multi-stage pump with a) Impeller in series and b) Impeller in parallel [4+4] Q2). Discuss the influence of exit blade angle on the performance and efficiency of centrifugal pump. Assuming radial flow at entrance. [6] Q3) A centrifugal pump has an impeller 0.29m diameter running at 960rpm with an effective outlet vane angle 28. The velocity of flow (assumed uniform throughout the system) is 2m/s. The static suction lift is 2.8m. The energy losses in metres of water are : in suction pipe,0.61m; in impeller,0.49m; in volute casing, 0.88m. From these particulars calculate the readings of vacuum or pressure gauges placed i) at inlet to the pump, ii) at impeller outlet(in clearance space between impeller and volute), iii) at pump outlet or delivery flange, 0.2m above the centerline of the pump [4+3] EME-011 / Ms.Ujjwala Pandey, Mr. Ankit Verma Date:02/04/2012 1

10 B.Tech. [SEM VI (ME-61,62,63 &64)] QUIZ TEST-3 Q1). A centrifugal pump running at 800rpm is working against a total head of 20.2m. The external diameter of the impeller is 480mm and outlet width 60mm. If the vane s angle at the outlet is 40 and manometric efficiency is 70%, determine: i) Flow velocity at outlet ii) Absolute velocity of water leaving the vane iii) Rate of flow through the pump. (Q.No.3) [2+2+2] Q2). Find the height from the water surface at which a centrifugal pump may be installed to avoid cavitation: Atmospheric pressure=1.01 bar; vapour pressure=0.022 bar; inlet and other losses in suction pipe=1.42m; effective head of the pump=49m; and cavitation parameter. (supplementary Q.No.13) [4] Q1). i) What are the effects of cavitation in pumps? Give the necessary precautions against cavitation. ii) Describe multi-stage pump with a) Impeller in series and b) Impeller in parallel [4+4] Q2). Discuss the influence of exit blade angle on the performance and efficiency of centrifugal pump. Assuming radial flow at entrance. [6] Q3) A centrifugal pump has an impeller 0.29m diameter running at 960rpm with an effective outlet vane angle 28. The velocity of flow (assumed uniform throughout the system) is 2m/s. The static suction lift is 2.8m. The energy losses in metres of water are : in suction pipe,0.61m; in impeller,0.49m; in volute casing, 0.88m. From these particulars calculate the readings of vacuum or pressure gauges placed i) at inlet to the pump, ii) at impeller outlet(in clearance space between impeller and volute), iii) at pump outlet or delivery flange, 0.2m above the centerline of the pump [4+3] EME-011 / Ms.Ujjwala Pandey, Ms. Ankit Verma Date:02/04/2012 1

11 QUIZ TEST-3 Q1). A centrifugal pump is to discharge 0.118m 3 /s at a speed of 1450 rpm against a total head of 25m. The impeller diameter is 250mm, its width at the outlet is 50mm and manometric efficiency is 75% and manometric efficiency is 75%. Determine the vane angle at the outer periphery of impeller. (Q.No.2) [4] Q2). A pump impeller is 375mm in diameter and it discharges water with velocity components of 2m/s and 12m/s in the radial and tangential directions respectively. The impeller is surrounded by a concentrical cylindrical chamber with parallel sides; the outer diameter being 450mm. If the flow in the chamber is a free spiral vortex, find: i) The component velocities of water on leaving, and ii) the increase in pressure. Assume losses to be negligible. (Q.No.6) [3+3] Q1). i) What are the effects of cavitation in pumps? Give the necessary precautions against cavitation. ii) Describe multi-stage pump with a) Impeller in series and b) Impeller in parallel [4+4] Q2). Discuss the influence of exit blade angle on the performance and efficiency of centrifugal pump. Assuming radial flow at entrance. [6] Q3) A centrifugal pump has an impeller 0.29m diameter running at 960rpm with an effective outlet vane angle 28. The velocity of flow (assumed uniform throughout the system) is 2m/s. The static suction lift is 2.8m. The energy losses in metres of water are : in suction pipe,0.61m; in impeller,0.49m; in volute casing, 0.88m. From these particulars calculate the readings of vacuum or pressure gauges placed i) at inlet to the pump, ii) at impeller outlet(in clearance space between impeller and volute), iii) at pump outlet or delivery flange, 0.2m above the centerline of the pump. [4+3] EME-011 / Ms.Ujjwala Pandey, Ms. Ankit Verma Date:02/04/2012 1

12 QUIZ TEST-3 Q1). The impeller of a centrifugal pump had an external diameter of 450mm and internal diameter of 200mm and it runs at 1440rpm. Assuming a constant radial flow through the impeller at 2.5m/s and that the vanes at exit are set at an angle 25, determine: i) inlet vane angle, ii) The angle, absolute velocity of water at exit makes with the tangent, and iii) The work done per N of water. (Q.No.1) [2+2+1] Q2). A centrifugal pump is discharging 0.03m 3 /s of water against a total head of 20m. The diameter of the impeller is 400mm and it is rotating at 1500rpm. Calculate the head, discharge and ratio of powers of a geometrically similar pump of diameter 250mm when it is running at 3000rpm? (Q.No.10) [2+2] Q1). i) What are the effects of cavitation in pumps? Give the necessary precautions against cavitation. ii) Describe multi-stage pump with a) Impeller in series and b) Impeller in parallel [4+4] Q2). Discuss the influence of exit blade angle on the performance and efficiency of centrifugal pump. Assuming radial flow at entrance. [6] Q3) A centrifugal pump has an impeller 0.29m diameter running at 960rpm with an effective outlet vane angle 28. The velocity of flow (assumed uniform throughout the system) is 2m/s. The static suction lift is 2.8m. The energy losses in metres of water are : in suction pipe,0.61m; in impeller,0.49m; in volute casing, 0.88m. From these particulars calculate the readings of vacuum or pressure gauges placed i) at inlet to the pump, ii) at impeller outlet(in clearance space between impeller and volute), iii) at pump outlet or delivery flange, 0.2m above the centerline of the pump [4+3] EME-011 / Ms.Ujjwala Pandey, Ms. Ankit Verma Date:02/04/2012 1

13 QUIZ TEST-3 Q1). It is required to deliver 0.048m 3 /s of water to a height of 24m through a 150mm diameter pipe and 120m long, by a centrifugal pump. If the overall efficiency of the pump is 75% and co-efficient of friction, f=0.01 for the pipeline, find the power required to drive the pump. (Q.No.4) [4] Q2). A three stage centrifugal pump has impeller 400mm in diameter and 20mm wide. The vane angle at outlet is 45 and the area occupied by the thickness of the vanes may be assumed 8% of total area. If the pump delivers 3.6m 3 of water per minute when running at 920rpm.determine: i) power of the pump ii) manometric head and iii) specific head. Assume mechanical efficiency as 88% and manometric efficiency as 77%. (Q.No.8) [2+2+2] Q1). i) What are the effects of cavitation in pumps? Give the necessary precautions against cavitation? ii) Describe multi-stage pump with a) Impeller in series and b) Impeller in parallel [4+4] Q2). Discuss the influence of exit blade angle on the performance and efficiency of centrifugal pump. Assuming radial flow at entrance. [6] Q3) A centrifugal pump has an impeller 0.29m diameter running at 960rpm with an effective outlet vane angle 28. The velocity of flow (assumed uniform throughout the system) is 2m/s. The static suction lift is 2.8m. The energy losses in metres of water are : in suction pipe,0.61m; in impeller,0.49m; in volute casing, 0.88m. From these particulars calculate the readings of vacuum or pressure gauges placed i) at inlet to the pump, ii) at impeller outlet(in clearance space between impeller and volute), iii) at pump outlet or delivery flange, 0.2m above the centerline of the pump [4+3] EME-011 / Ms.Ujjwala Pandey, Ms. Ankit Verma Date:02/04/2012 1

14 QUIZ TEST-4 Q1).Classify positive displacement pumps in detail. What advantage they gain over Rotary pumps? (Q.No.12) [5] Q2).A single-acting reciprocating pump has a diameter (piston) of 100mm and stroke length 200mm. The length and diameter of the suction pipe are 6.5m and 50mm respectively. If the suction lift of the pump is 3.2m and separation occurs when pressure in the pump falls below 2.5m of water absolute and the manometer reads 763mm of mercury, find the maximum speed at which pump can be run without separation in the suction pipe. (Q.No.2) [5] Q1) Derive an expression for effect of variation of velocity on friction in suction and delivery pipes. Find the condition when maximum value of loss of head due to friction is obtained. [5+2] Q2) i) Explain the phenomena of separation in reciprocating pumps. [3] ii) What is the difference between the work done by a single acting reciprocating pump and a double acting reciprocating pump? [4] Q3) A single acting reciprocating pump of 0.2m diameter and 0.4m stroke runs at 30rpm. The suction and delivery heads are 3.6m and 30m respectively. The length of suction pipe is 9m and that of delivery pipe is 60m and the diameter of each pipe is 100mm. Large air vessels are provided 2m away from the pump on the suction side and 6m away on the delivery side, both measured along the pipeline. Darcy s friction factor for the pipes is and H atm =10.3m of water. Determine the expressions for total absolute pressure heads in terms of θ during delivery stroke. [6] X EME-011 / Ms.Ujjwala Pandey, Mr. Ankit Verma Date: 24/04/2010

15 QUIZ TEST-4 Q1) What is an air vessel? Explain its function in reciprocating pumps during suction and delivery strokes. (Q.No.11) [4] Q2) A single acting reciprocating pump has a stroke length of 150mm, suction pipe is 7m long and ratio of suction pipe diameter to the piston diameter is 3/4. The water level in the sump is 2.5m below the axis of the pump cylinder and the pipe connecting the sump and pump cylinder is 75mm in diameter. If the crank is running at 75 rpm determine the pressure head on the piston at the beginning, middle and end of the suction stroke. Take friction co-efficient f=0.01. (Q.No.7) [6] Q1) Derive an expression for effect of variation of velocity on friction in suction and delivery pipes. Find the condition when maximum value of loss of head due to friction is obtained. [5+2] Q2) i) Explain the phenomena of separation in reciprocating pumps. [3] ii) What is the difference between the work done by a single acting reciprocating pump and a double acting reciprocating pump? [4] Q3) A single acting reciprocating pump of 0.2m diameter and 0.4m stroke runs at 30rpm. The suction and delivery heads are 3.6m and 30m respectively. The length of suction pipe is 9m and that of delivery pipe is 60m and the diameter of each pipe is 100mm. Large air vessels are provided 2m away from the pump on the suction side and 6m away on the delivery side, both measured along the pipeline. Darcy s friction factor for the pipes is and H atm =10.3m of water. Determine the expressions for total absolute pressure heads in terms of θ during delivery stroke. [6] EME-011 / Ms.Ujjwala Pandey, Mr. Ankit Verma Date: 24/04/2012

16 C SHRI RAMSWAROOP MEMORIAL COLLEGE OF ENGG. & MANAGEMENT B.Tech. [SEM VI(ME-61,62,63 & 64)] QUIZ TEST-4 Q1). Explain with neat sketch the working of a gear pump. Mention its advantages over conventional type of pumps. (Q.No.8) [5] Q2). The cross-sectional area of a plunger of a reciprocating pump equals 1.5 times that of a delivery pipe. The delivery pipe is 60m long and it rises upward at a slope of 1in 6. If the plunger has an acceleration of 2.4m/s 2 at the end of the stroke and separation pressure is 2.5m of water, find whether separation will take place and if so, at which section of pipe. (Q.No.3) [5] Q1) Derive an expression for effect of variation of velocity on friction in suction and delivery pipes. Find the condition when maximum value of loss of head due to friction is obtained. [5+2] Q2) i) Explain the phenomena of separation in reciprocating pumps. [3] ii) What is the difference between the work done by a single acting reciprocating pump and a double acting reciprocating pump? [4] Q3) A single acting reciprocating pump of 0.2m diameter and 0.4m stroke runs at 30rpm. The suction and delivery heads are 3.6m and 30m respectively. The length of suction pipe is 9m and that of delivery pipe is 60m and the diameter of each pipe is 100mm. Large air vessels are provided 2m away from the pump on the suction side and 6m away on the delivery side, both measured along the pipeline. Darcy s friction factor for the pipes is and H atm =10.3m of water. Determine the expressions for total absolute pressure heads in terms of θ during delivery stroke. [6] EME-011 / Ms.Ujjwala Pandey, Mr. Ankit Verma Date: 24/04/2012

17 B.Tech. [SEM VI(ME-61,62,63 & 64)] QUIZ TEST-4 Q1) Show from the first principles that the work saved in double acting reciprocating pump, by fitting an air vessel is 39.2%. (Q.No.10) [5] Q2). A single acting reciprocating pump running at 60rpm, delivers 0.53m 3 of water per minute. The diameter of the piston is 200mm and stroke length 300mm. The suction and delivery heads are 4m and 12m respectively. Determine: i) Theoretical discharge, ii) Percentage slip of the pump, and iii) Power required to run the pump. (Q.No.4) [5] Q1) Derive an expression for effect of variation of velocity on friction in suction and delivery pipes. Find the condition when maximum value of loss of head due to friction is obtained. [5+2] Q2) i) Explain the phenomena of separation in reciprocating pumps. [3] ii) What is the difference between the work done by a single acting reciprocating pump and a double acting reciprocating pump? [4] Q3) A single acting reciprocating pump of 0.2m diameter and 0.4m stroke runs at 30rpm. The suction and delivery heads are 3.6m and 30m respectively. The length of suction pipe is 9m and that of delivery pipe is 60m and the diameter of each pipe is 100mm. Large air vessels are provided 2m away from the pump on the suction side and 6m away on the delivery side, both measured along the pipeline. Darcy s friction factor for the pipes is and H atm =10.3m of water. Determine the expressions for total absolute pressure heads in terms of θ during delivery stroke. [6] EME-011 / Ms.Ujjwala Pandey, Mr. Ankit Verma Date: 24/04/2012

18 B.Tech. [SEM VI(ME-61,62,63 & 64)] QUIZ TEST-4 u Q-1) Draw an indicator diagram. Prove that work done by the pump is proportional to the area of the indicator diagram. (Q.No.9) [5] Q.2). A single-acting reciprocating pump has a diameter(piston) of 150mm and stroke length 350mm.The centre of the pump is 3.5m above the water surface in the sump and 22m below the delivery water level. Both the suction and delivery pipes have the same diameter of 100mm and are 5m and 30m long respectively. If the pump is working at 30rpm. Determine: i) The pressure heads on the piston at the beginning, middle and end suction stroke. ii) The power required to drive the pump. Take atmospheric pressure as 10.3m of water. (Q.No.1) [5] Q1) Derive an expression for effect of variation of velocity on friction in suction and delivery pipes. Find the condition when maximum value of loss of head due to friction is obtained. [5+2] Q2) i) Explain the phenomena of separation in reciprocating pumps. [3] ii) What is the difference between the work done by a single acting reciprocating pump and a double acting reciprocating pump? [4] Q3) A single acting reciprocating pump of 0.2m diameter and 0.4m stroke runs at 30rpm. The suction and delivery heads are 3.6m and 30m respectively. The length of suction pipe is 9m and that of delivery pipe is 60m and the diameter of each pipe is 100mm. Large air vessels are provided 2m away from the pump on the suction side and 6m away on the delivery side, both measured along the pipeline. Darcy s friction factor for the pipes is and H atm =10.3m of water. Determine the expressions for total absolute pressure heads in terms of θ during delivery stroke. [6] X EME-011 / Ms.Ujjwala Pandey, Mr. Ankit Verma Date: 24/04/2012