UNIT II BALANCING TWO MARKS QUESTIONS 1What is meant by balancing What are the

# Unit ii balancing two marks questions 1what is meant

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UNIT – II - BALANCING TWO-MARKS QUESTIONS 1.What is meant by balancing? What are the reasons for unbalanced forces?2.Why balancing is necessary?3.Define dynamic balancing?4.What are the various types of balancing of rotating masses?5.What is meant by rocking?6.How will you balance several masses rotating in different planes?7.In case of balancing of several masses in different planes, what are the two conditions to be satisfied in reference plane for complete balance?8.What do you mean by the balancing of reciprocating masses?9.Define swaying couple?10.Define hammer blow?11.Explain the term primary balancing and secondary balancing?12.What are the conditions required for complete balancing of reciprocating parts? ME \ 3 rd \6 th sem DOM\ME6505 A.P \ K. SRIDHAR 6 | P a g e 13.Briefly explain the procedure of force balancing of linkages by Berkof-lowen method?14.Why complete balancing of reciprocating masses is not possible in a single cylinder engine - justify?16-MARKS QUESTIONS1.Three masses are attached to a shaft as follows: 10 kg at 90 mm radius, 15 kg at 120 mm radius and 9 kg at 150 mm radius. The masses are to be arranged so that shaft is in static balance. Determine the angular position of masses relative to 10 kg mass. All the masses are in the same plane? 2.The data for three rotating masses are given below: M1= 4 kg, M2 = 3 kg, M3 = 2.5 kg the corresponding radius are R1 = 75mm, R2 = 85 mm, R3 = 50 mm and θ1 = 45ο, θ2 = 135ο, θ3 = 240ο. Determine the amount of the counter mass at a radial distance of 65mm required for their static balance?3.A shaft carries four masses in parallel planes A, B, C and D in this order along its length. The masses at B and C are 18 kg and 12.5 kg respectively and each has an eccentricity of 60mm. the masses at A and D has an eccentricity of 80mm. The angle between the masses at B and C is 100 οand between masses at B and A is 190ο, both is measured in the same direction. The axial distance between plane A and B is 100 mmand between B and C is 200 mm. If the shaft is in complete dynamics balances determine: a) The magnitude of masses at A and D, b) The distance between planes A and D, c) Angular position of mass at D. ME \ 3 rd \6 th sem DOM\ME6505 A.P \ K. SRIDHAR 7 | P a g e 4.A shaft carries four masses A, B, C and D of magnitude 200 kg, 300 kg , 400 kg and 200kg respectively and revolving at radii 80mm, 70mm, 60mm and 80mm in planes measured from A at 300mm, 400mm and 700mm. The angles between the cranks measured anticlockwise are A to B 45 ο, B to C 70 οand C to D 120 ο. The balancing masses are to bein planes X and Y. Distance between planes A and X is 100mm, betweenX and Y is 400mm and between Y and D is 200mm. If balancing masses revolve at radius of 100mm, find their magnitude and angular positions.5.A two cylinder uncoupled locomotive with cranks at 90 degree has a crank radius of 320mm. The distance between the centers of driving wheel is 1.4 m. The pitch of cylinders is 0.6 m. the diameter of treads of driving wheels is 1.8 m. the radius of centers of gravity of balance masses is 0.65 m. the pressure due to dead load on each wheel is 40kN. The masses of reciprocating and rotating parts per cylinder are 330kg and 300 kg respectively. The speed of the locomotive is 60km/hr. Find a)  • • • 