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ISRO ME 2019 MACHINE DESIGN 2
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Question 1
A column is fixed to a steel column by means of 2 bolts. The material of bolt is mild steel with yield strength 150MPa and factor of safety is 3. Find the permissible shear stress induced for a bolt.
Question 2
The following fig. shows the pitch circle of a train of gears. The gear A receives 4 kW power and the rotation is 800 rpm. Gear B is the idler gear and gear C is the driven gear. The number of teeth on gears A, B and C are 20, 50 and 30 respectively. The torque acting on gear C is (assume 200 involutes depth system for gears)
Question 3
A steam boiler is to be designed for a working pressure of 2.5 MPa with its inside diameter of 1.6 m and thickness is 30 mm. If number of rivets is 45 per row and diameter of each rivet is 35 mm, then the efficiency (%) of circumferential joint is:
Question 4
Self locking property is lost when:
Question 5
The ratio of Modified endurance limit to endurance limit if the size factor (Ksz), surface finish factor (Ksur) and Load factor (
), take the values of 0.75, 0.8 and 1 respectively is (Neglect all other remaining miscellaneous factors)
), take the values of 0.75, 0.8 and 1 respectively is (Neglect all other remaining miscellaneous factors) Question 6
A ball bearing is characterized by basic static capacity = 11000 N and dynamic capacity = 18000 N. This bearing is subjected to equivalent static load = 6000 N. The bearing loading ratio and life in million revolutions respectively are:
Question 7
What will be the maximum pressure in a plate clutch of outer radius 400 mm and inner radius 250 mm when the minimum pressure is 45 N/mm2______.
Question 8
Match the List-1 with List-2 and select the correct answer using the codes given below (where
)
) Question 9
A flexible (8 × 19) steel wire rope of 40 mm diameter is used with 2 m diameter hoist drum to lift a load. The diameter of the wire may be taken as 0.05 d, where, d is the diameter of wire rope. Modulus of elasticity of the entire rope is 84 × 103 N/m2. What will be the maximum bending stress (in MPa) in the wire rope ?
Question 10
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)
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