Q. A monitoring system has seven components. The reliability of each component is shown in the figure. The system reliability is  ___________(round off to 2 decimal places) Ans: 0.16-0.18 Sol: Rs = R1 × Rs3 × R7 Rs = 0.5 × 0.87 × 0.4 = 0.174

Q. A process which is in a state of statistical control (within ± 3s ) has an estimate of standard deviation (s) 2 mm. The specification limits for the corresponding product are 120 ± 8 mm. When process mean shifts from 118 mm to 122 mm with no change in process standard deviation, the difference ...

Q. A CO2 laser in continuous mode is used for drilling a plate. The process parameters and their values are Laser power intensity1×108 W/mm2Vaporization energy5×106 J/mm3Efficiency of the process15 %Laser spot diameter200 micrometer Ans: 6 Sol:

Q. During a turning operation of a specific work material having shear strength of 220 MPa under orthogonal cutting condition, the process parameters are Feed0.2 mm/revDepth of cut1 mmRake angle– 5˚ Given chip thickness ratio as 0.5, friction angle as 49.2˚ and shear angle as 25.4˚, the feed ...

Q. A sand casting process has a mold constant of 2 s/mm2 and solidification exponent of 2. If the solidification time is to be doubled for a given unit   volume   of material, the corresponding reduction in the cast surface area (in %) is     Ans: 28-31 Sol:

Q. The heat transfer efficiency in arc welding of a plate using a current of 250 A at 20 V is 90%. The heat required to melt the material is 10 J/mm3. If the cross-sectional area of the weld joint is 30 mm2 and the travel speed is 5 mm/s, the melting efficiency (in %) is_____(round off to 2 ...

Q. A cam is designed to achieve a simple harmonic motion of a flat-faced follower. Starting from the rest, the follower rises to the maximum height of 50 mm at 180˚ of cam rotation as shown in the figure. If the cam rotates at a uniform angular speed of 100 rpm, the speed of the follower ...

Q. A thin walled cylindrical pressure vessel with an inside diameter of 300 mm and wall thickness of 3 mm is subjected to an internal gauge pressure of 1.5 MPa. The maximum shear stress (in MPa) at a point located on the inner surface of the pressure vessel is        Ans: 37 - 40 Sol: ...

Q. Considering included angle θ of the thread to be 60˚ using the Best-Wire method, the difference between the effective diameter (E ) and the dimension under the wire (T ) for M10 × 1.0 mm is closest to (A) 0.289(B) 0.578(C) 0.867(D) 0.982 Ans: 0.289 Sol:

Q. A firm, with a production target of 50,000 units/year, has the following data for the selection of a new location for its plant LocationFixed cost (Rs.)Variable costs per unit (Rs.)P110,0002Q95,0002.5R80,0003S75,0003.5 The most economical location for the firm is (A) ...

Q. A company invests Rs.50 thousand in assets. The initial investment is Rs.30 thousand with two subsequent investments of Rs.10 thousand each at the end of 1st year and 2nd year. The useful life of the assets is 10 years with no salvage value at the end. If the interest rate is 10% and the ...

Q. The mean time to repair (MTTR) for a repairable system is 30 minutes. When maintenance time changes from 20 minutes to 40 minutes, the net increase in maintainability is closest to (A) 0.15(B) 0.25(C) 0.45(D) 0.60 Ans: 0.25 Sol: