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ISRO ME 2019 MACHINE DESIGN 3
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Question 1
Following are the types of joint is and used in
Question 2
The tensions on a belt are 245N and 165N. The pulleys have a diameter of 240mm and rotate at 1200rpm. Find the amount of power transmitted.
Question 3
A gear is powered by a motor having 20 kW and torque of 120 Nm. The tangential force acting on the gear is 450 N and the number of teeth on the gears is 26. Find the module ( in mm) of the gears _______.
Question 4
A Roller bearing has a basic dynamic load rating of 50 kN. If the equivalent radial load on the bearing in 70 kN, the expected life in (106 revolutions) is
Question 5
In a gas turbine rotor, a radial stress of 20 MPa and a tangential stress of 50 MPa have been found at a point shown in figure. What is the maximum shear stress at this point in MPa?
Question 6
Match the following applications with the types of simple machine elements:
Question 7
Two flat plates of 150 mm width and 30 mm thickness subjected to a 200 kN tensile force are connected by means of single riveted lap joint. A 25 mm diameter rivet and plate are made of same material. The shear strength, tensile strength and crushing strength of the material are 300 kN, 280 kN and 310 kN respectively. The efficiency of the joint is ( Take Permissible tensile stress is 80 MPa)
Question 8
Threaded Bolts B1 and B2 of similar length and material are subjected to similar tensile load. If the elastic strain energy stored in bolt B1 is 4 times as compared to bolt B2, then what will be the mean diameter of bolt B2. The mean diameter of bolt B1 is 20mm.
Question 9
A journal bearing has a shaft diameter of 40 mm and a length of 40 mm. The shaft is rotating at 20 rad/s and the viscosity of the lubricant is 20mPa.s. The clearance is 0.020 mm. The loss of torque due to the viscosity of the lubricant is approximately
Question 10
The maximum pressure in a plate clutch where the axial force is 4000 N, the inside radius of contact is Ri = 80 mm, the outside radius is R0 = 100 mm, (Uniform wear is assumed) is______.
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