Subject Code:

DEPARTMENT OF MECHANICAL ENGINEERINGIII Year B. Tech., I-Sem.

Subject: DESIGN OF MACHINE MEMBERS-IINote: - All Questions are mapped with Blooms Taxonomy Levels and Course Outcomes.

UNIT-I2-MARKS QUESTIONS

S.No. Questions Skills CO P.I1 Define the bearing. Remember C322.1 1.4.1,.3.1

2 How are the bearing classified. Remember C322.1 1.4.1

3 Claasifythe types of sliding contact bearing. Analysis C322.1 1.4.1

4 Define of journal bearing? Remember C322.1 1.4.1

5 Explain the desirable properties of bearing materials? understand C322.1 1.4.1

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

1 Di eren&ate between full journal bearing and partial journal ffbearing. understand C322.1 1.4.1

2Define following terms.i)diameteral clearance ii)diameteral clearance ratioiii) Ecccentricity iv) minimum film thickness

rememberC322.1 1.4.1,1.3.1

3 Define the Somerfield nuber remember C322.1 1.4.1

4 Describe the design procedure for the journal bearing. Understand C322.1 1.4.1

5

Design a journal bearing for centrifugal pump for following data. Load on the journal =1KN,Diameter of the journal=75mm,speed=1400rpm,Atmosphere temperature=250cOperating temperature=700c.

Create

C322.1 1.4.1,1.3.1

5-MARKS QUESTIONSS.No. Questions Skills CO 1.4.1

1 Design of the journal bearing for the steam turbine,whose shaft is supported on two bearings one at each side of the turbine,and is coupled with a generator for power production.The weight of the turbine with shaft is measured as 40KN and shaft rotates at 1500rpm. Diameter of the shaftis 100mm.

Create

C322.1 1.4.1,1.3.1

2 The load on a 100mmfull hydrodynamic journal bearing is 9000N.speed of the journal is 320mm.let l/d=1,c/d=0.0011.the operating temperature=650c and minimum oil thickness=0.022mm.(i)Select an oil that will closely accord with stated conditions.For the selected oil determine (ii)the friction loss(iii)the hydrodynamic oil flow through the bearing(iv)the amount of leakage (v)the temperature rise of oil passes through bearing.(vi)maximum oil pressure

Apply C322.1 1.4.1,1.3.1

3 A full journal bearing of 50 mm diameter and 100 mm long has a bearing pressure of 1.4 N/mm2. The speed of the journal is 900 r.p.m. and the ratio of journal diameter to the diametral clearance is 1000. The bearing is lubricated with oil whose absolute viscosity at the operating temperature of 75°C may be taken as 0.011 kg/m-s. The room temperature is 35°C. Dertermine : 1. The amount of artificial cooling required, and 2. The mass of the lubricating oil required, if the difference between the outlet and inlet temperature of the oil is 10°C. Take specific heat of the oil as 1850 J / kg / °C.

Apply

C322.1 1.4.1

4 Design a journal bearing for a centrifugal pump from the following data : Load on the journal = 20 000 N; Speed of the journal = 900 r.p.m.; Type of oil is SAE 10, for which the absolute viscosity at 55°C = 0.017 kg / m-s; Ambient temperature of oil = 15.5°C ; Maximum bearing pressure for the pump = 1.5 N / mm2. Calculate also mass of the lubricating oil required for artificial cooling, if rise of temperature of oil be limited to 10°C. Heat dissipation coefficient = 1232 W/m2/°C.

Create C322.1 1.4.1,1.3.1

5 The load on the journal bearing is 150 kN due to turbine shaft of 300 mm diameter running at 1800 r.p.m. Determine the following : 1. Length of the bearing if the allowable bearing pressure is 1.6 N/mm2, and 2. Amount of heat to be removed by the lubricant per minute if the bearing temperature is 60°C and viscosity of the oil at 60°C is 0.02 kg/m-s and the bearing clearance is 0.25 mm.

Apply C322.1 1.4.1

Subject Code:

DEPARTMENT OF MECHANICAL ENGINEERINGIII Year B. Tech., I-Sem.

Subject: DESIGN OF MACHINE MEMBERS-IINote: - All Questions are mapped with Blooms Taxonomy Levels and Course Outcomes.

UNIT-II2-MARKS QUESTIONS

S.No. Questions Skills CO P.I

1 Define the rolling contact bearing. Remember C322.2 1.4.1

2 Describe the Antifriction bearing understand C322.2 1.4.1

3 Define the equivalent load Remember C322.2 1.4.1,1.3.1

4 Explain the applications of rolling contact bearing understand C322.2 1.4.1

5 List of the main components of rolling bearing. remember C322.2 1.4.1,1.3.1

3-MARKS QUESTIONSS.No. Questions Skills CO 1.4.1

1 Explain the following termsi) Ball Bearing ii) Roller bearing understand C322.2 1.4.1

2 Explain the life of a bearing? understand C322.2 1.4.1

3 classifications of different types of antifriction bearings. Analyse C322.2 1.4.1

4 What factors should be considered when selecting rolling bearings. remember C322.2 1.4.1

5Explain on i)static load rating ii) Dynamic load ratingAverage life of bearing iii) influence of temperature on bearing capacity iv)selection of bearing based on variable loading.

understandC322.2 1.4.1

5-MARKS QUESTIONSS.No. Questions Skills CO 1.4.1

1 A bearing for an axial flow compressor is used to support a radial load of 2500N and thrust load of 1500N.the service requires for the bearing is 5 years at the rate of 40 hours per week. The speed of the shaft is 1000 rpm select suitable ball bearing for the purpose. Diameter of the shaft is 50mm.

Analyse

C322.2 1.4.1,1.3.1

2 Select a suitable deep groove ball bearing for supporting a radial load of 10KN and axial load of 3KN for the life of 4000hrs at 800rpm select for series 63 Calculate expected life of the selected bearing.

Analyse C322.2 1.4.1,1.3.1

3 Select a single row deep groove ball bearing for a radial load of 4000 N and an axial load of 5000 N, operating at a speed of 1600 r.p.m. for an average life of 5 years at 10 hours per day. Assume uniform and steady load.

Analyse

C322.2 1.4.1,1.3.1

4 Design a self-aligning ball bearing for a radial load of 7000 N and a thrust load of 2100 N. The desired life of the bearing is 160 millions of revolutions at 300 r.p.m. Assume uniform and

Create C322.2 1.4.1

steady load,5 The operating schedule of a ball bearing is as follows

Radial load of 1650N at 2000rpmfor 5% life timeRadial load of 1140N at 3300rpmfor 15% life timeRadial load of 560N at 1750rpmfor 35% life timeRadial load of 445N at 2200rpmfor 45% life timeThe inner ring rotates and the loads are steady. The life is to be 10 years at 2 hours per day operations. Select suitable ball bearing

Analyse C322.2 1.4.1,1.3.1

Subject Code:

DEPARTMENT OF MECHANICAL ENGINEERINGIII Year B. Tech., I-Sem.

Subject: DESIGN OF MACHINE MEMBERS-IINote: - All Questions are mapped with Blooms Taxonomy Levels and Course Outcomes.

UNIT-III2-MARKS QUESTIONS

S.No. Questions Skills CO P.I1 Explain the function of piston understand C322.3 1.4.1

2 What is I.C. engine and where is it employed. remember C322.3 1.4.1

3 Define the piston rod connecting rod. Remember C322.3 1.4.1

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

1 What are the materials used for piston rod and connecting rod. Remember C322.3 1.4.1,1.3.1

2 define slenderness ratio. Remember C322.3 1.4.1,1.3.1

3 Explain it significance in the design of connecting rod. Understand C322.3 1.4.1,1.3.1

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

1 Design a cast iron piston for a single acting four stroke I.C. engine for the following specifications.Cylinder bore:100mm,Stroke length:120mm,Maximum pressure:6Mpa,Brake mean effective pressure:0.7Mpa,fual consumptions:0.24kg/kw/hr,speed:2200

Analyse C322.3

1.4.1

2 Explain the methods of designing of piston rod , connecting rod. understand C322.3 1.4.1

3 Design of the piston rod for an engine whose bore diameter is 200mm.The length of the piston rod is 750mmand stroke length is 400mm.the pressure of the steam is found to be 1 N/mm2 Assume factory of safety as 5

Analyse C322.3

1.4.1,1.3.1

OBJECTIVE QUESTIONS

UNIT-11. In a full journal bearing, the angle of contact of the bearing with the journal is (d) (a) 120° (b) 180° (c) 270° (d) 360° 2. A sliding bearing which can support steady loads without any relative motion between the journal and the bearing is called (d)(a) zero film bearing (b) boundary lubricated bearing (c) hydrodynamic lubricated bearing (d) hydrostatic lubricated bearing3. In a boundary lubricated bearing, there is a ................ of lubricant between the journal and the bearing. (a) thick film (b) thin film (c) a &b (d) none (b) 4. When a shaft rotates in anticlockwise direction at slow speed in a bearing, then it will (c)(a) have contact at the lowest point of bearing (b) move towards right of the bearing making metal to metal contact (c) move towards left of the bearing making metal to metal contact (d) move towards right of the bearing making no metal to metal contact 5. The property of a bearing material which has the ability to accommodate small particles of dust, grit etc., without scoring the material of the journal, is called (b)(a) bondability (b) embeddability (c) comformability (d) fatigue strength 6. Teflon is used for bearings because of (a)(a) low coefficient of friction (b) better heat dissipation (c) smaller space consideration (d) all of these 7. When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be ............... the bearing modulus. (c) (a) 5 times (b) 10 times (c) 15 times (d) 20 times 8. When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a (d)(a) short bearing (b) long bearing (c) medium bearing (d) square bearing 9. If Z = Absolute viscosity of the lubricant in kg/m-s, N = Speed of the journal in r.p.m., and p = Bearing pressure in N/mm2, then the bearing characteristic number is (a)(a)Z N/ p (b) Z p/ N (c) Z p/N (d)pN /Z10. In thrust bearings, the load acts (a) (a) along the axis of rotation (b) parallel to the axis of rotation (c) perpendicular to the axis of rotation (d) in any direction

1.Hydrostatic bearing usually use ____ as lubricant (Oil)

2. The location of journal is measured _______________ (Attitude angle)

3. Hydrostatic bearing enters Hydrodynamic state when the journal is_____________(Rotating)

4. Temperature rise in partial bearing is ____ than full bearing. (Lesser)

5. _______________ bearings given not be subjected to a thrust load. (Cylindrical (straight) roller bearing)

6. A bearing is designated by the number 405. It means that a bearing is of____( heavy series with bore of 25 mm)

7. ------------------- of bearing provides a bearing surface for forces acting along axis to the shaft.( Thrust bearing)8.------------------------------bearing used in crankshaft is (Plain bearing)9. When the load of bearing is carried by direct surface to surface contact is called-----------------( Dry condition)10. For Ovens and dryers, the ----------------------------material is used to make bearings (Graphite alloy)

UNIT-II1. The rolling contact bearings are known as (d)(a) thick lubricated bearings (b) plastic bearings (c) thin lubricated bearings (d) antifriction bearings 2. The bearings of medium series have capacity .......... over the light series. (c) (a) 10 to 20% (b) 20 to 30% (c) 30 to 40% (d) 40 to 50% 3. The bearings of heavy series have capacity .......... over the medium series. (b) (a) 10 to 20% (b) 20 to 30% (c) 30 to 40% (d) 40 to 50% 4. The ball bearings are usually made from (d)(a) low carbon steel (b) medium carbon steel (c) high speed steel (d) chrome nickel steel 5. The tapered roller bearings can take (c)(a) radial load only (b) axial load only (c) both radial and axial loads (d) none of the above 6. The piston pin bearings in heavy duty diesel engines are (a) (a) needle roller bearings (b) tapered roller bearings (c) spherical roller bearings (d) cylindrical roller bearings 7. Which of the following is antifriction bearing? (d)(a) journal bearing (b) pedestal bearing (c) collar bearing (d) needle bearing 8. Ball and roller bearings in comparison to sliding bearings have (d)(a) more accuracy in alignment (b) small overall dimensions (c) low starting and running friction (d) all of these 9. A bearing is designated by the number 405. It means that a bearing is of (c) (a) light series with bore of 5 mm (b) medium series with bore of 15 mm (c) heavy series with bore of 25 mm (d) light series with width of 20 mm 10. The listed life of a rolling bearing, in a catalogue, is the (a) (a) minimum expected life (b) maximum expected life (c) average life (d) none of these

1. The bearings of medium series have capacity .......... over the light series (30 to 40%)

2. The rolling contact bearings are known as-------------------- (antifriction bearings)

3. Needle bearing --------------------------type of baring. (antifriction bearings)

4. Ball and roller bearings in comparison to sliding bearings have-----------------------( more accuracy in alignment)

5. Temperature rise in partial bearing is ____ than full bearing. (Lesser)

6. _______________ bearings given not be subjected to a thrust load. (Cylindrical (straight) roller bearing.

7. Hydrostatic bearing enters Hydrodynamic state when the journal is_____________(Rotating)

8. The location of journal is measured _______________ (Attitude angle)

9. Hydrostatic bearing usually use ____ as lubricant (Oil)

10 A bearing is designated by the number 405. It means that a bearing is of____( heavy series with bore of 25 mm)

UNIT-3

1. The cylinders are usually made of (a)

(a) cast iron or cast steel (b) aluminium (c) stainless steel (d) copper

2. The length of the cylinder is usually taken as (d)

(a) equal to the length of piston (b) equal to the length of stroke (c) equal to the cylinder bore (d) 1.5 times the length of stroke

3. The skirt of piston (b)

(a) is used to withstand the pressure of gas in the cylinder (b) acts as a bearing for the side thrust of the connecting rod (c) is used to seal the cylinder in order to prevent leakage of the gas past the piston (d) none of the above

4. The side thrust on the cylinder liner is usually taken as ........... of the maximum gas load on the piston.(c)

(a) 1/5 ( b) 1/8 (c) 1/10 (d) 1/5

5. The length of the piston usually varies between (a)

(a) D and 1.5 D (b) 1.5 D and 2 D (c)2 D and 2.5 D (d) 2.5 D and

1. The piston pin bearings in heavy duty diesel engines are ______________________( needle roller bearings)

2. If the temperature of intake air in internal combustion engine increases, then its efficiency will __________ (Decrease)

3. The ignition quality of petrol is expressed by __________________( Octane number ).

4. The ignition quality of petrol is expressed by __________________( Octane number )

5. The cylinders are usually made of ------------------------( cast iron or cast steel)