MODEL TEST PAPER 2 DME/6th Sem/MST-2 Q.1 Define Brake Q.2 Explain the design or capacity of brake Q.3 How does the function of the brake differ from that of a clutch Q.4 What are the material used for brake lining Q.5 What are a self-energizing brake Q.6 what are a self locking brake Q.7 The material used for brake lining should have……………..coefficient of friction Q.8 A brake commonly used in motor car………….. Q.9 When the frictional force helps to apply the brake then the brake is said to be…………. Q.10 A brake commonly used in railways trains is………………………….. Q.11 Explain the different types of brakes Q.12 Explain the difference b/w radial and axial brakes Q.13 Define simple band brake with the help of diagram Q.14 Differential Band brake with the help of diagram Q.15 Explain band and block brake with the help of diagram Q.16 Explain internal expanding brake with the help of diagram Q.17 Define belt drives and its types Q.18 Explain important factor in the selection of belt drives Q.19 Define the slip of belt Q.20 Define the creep of belt Q.21 Define power transmitted by a belt Q.22 Define centrifugal tension in the belt Q.23 Define initial tension in the belt Q.24Explain with the help of the neat sketches the types of various flat belts drives Q.25 Prove the ratio of driving tension on the two sides of a pulley is T1 /T2 =euo Q.26 List at least four material for flat belt Q.27 List the advantages and disadvantage of flat belt Q.28 An engine running at 150 drives a line shafts by means of a belt the engine pulley is 750mm dia. And the pulley on the shafts is 450mm a 900mm dia. Pulley on the line shafts drives a 150mm dia. Pulley keyed to a dynamo shafts find the speed of dynamo shafts, when 1. There is no slip 2. There is slip of2% at each drive Q.29 Two pulleys one 450mm dia. And other200mm dia. On parallel shafts 1.95m apart are connected by a crossed belt. Find the length of the belt required and the angle of contact b/w the belt and each pulley Q.30 A leather belt 9mm, 250mm is used to drive a cast iron pulley 900mm in diameter at 336r.p.m if active arc on the small pulley is 1200 and the stress in tight side in 2mpa find the power capacity of belt The density of leather may be taken as 980kg/m3 and the coefficient of friction 0.35 Q.31 Design a belt to transmit 110kw for a system consisting of two pulleys of dia. 0.9 and 1.2 center distance of 3.6m a belt speed 20m/s coefficient of friction 0.3, a slip of 1.2% at each pulleys and 5% friction loss at each shafts 20% over load Q.32 In a horizontal belt drive for a centrifugal blower the blower is belt driven at 600 r p m by a 15kw, 1750 p.m. electric motor the center distance is twice the dia. Of the larger pulley the density of belt material=1500kg/m3; max. Allowable stress=400MPA U1=0.5 ;U2=0.4 ; peripheral velocity of belt =20m/s Determine 1 pulleys diameter 2. Belt length 3. Cross –Sectional area of the belt 4.Minimum initial tension for operation without slip 5. Resultant force in the plan of the blower when operating with an initial tension 50% greater than the minimum value Q.33 The cast iron pulleys transmits 20 kw at 300 rpm the diameter of pulleys is 550mm and has four straight arms of elliptical cross section in which the major axis is twice the minor axis find the dimension of the arm if the allowable bending stress is 15mpa Q.34 A Single block brake the dia. Of the drum is 250mm and the angle of contact is 900 if the operating force of 700N is applied at the end of a lever and the coefficient of friction b/w the drum and the lining is 0.35 determine the torque that may be transmitted by the block brake Q.35 The block brake provides a braking torque of 360N-m the dia. Of the brake drum is 300mm the coefficient of friction is 0.3 Find 1. Force (p) for the clockwise and counter clockwise rotation of the brake drum 2. Location of pivot or fulcrum to make the brake self locking Q.36 A double shoe brake is capable of absorbing a torque of 1400N-m the dia. Of the brake drum is 350mm and the angle of contact for each shoe is 1000 if the coefficient of friction b/w the brake drum and lining is 0.4 find 1. Spring force necessary to set the brake 2. The width of brake shoes, if the bearing pressure on the lining material is not to exceeds 0.3N/mm2 Q.37 A differential band brake has a force of 220N applied at the end of a lever the coefficient of friction b/w the band and the drum is 0.4 the angle of lap is 1800 find 1. The maximum and minimum force in the band, when a clockwise torque of 450N-m is applied to the drum 2. The maximum torque that the brake may sustain for counter clockwise rotation of the drum Q.38 n engine running at 150 drives a line shafts by means of a belt the engine pulley is 750mm dia. And the pulley on the shafts is 450mm a 900mm dia. Pulley on the line shafts drives a 150mm dia. Pulley keyed to a dynamo shafts find the speed of dynamo shafts, when 1. There is no slip 2. There is slip of2% at each drive Q.39 Prove the ratio of driving tension on the two sides of a pulley is T1 /T2 =euo Q.40 Explain internal expanding with the help of diagram
Posted on: Wed, 19 Mar 2014 09:55:19 +0000
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