Q. A four bar mechanism is made up of links of length 100, 200, 300 and 350 mm. If the 350 mm link is fixed, the number of links that can rotate fully is . Ans: 1
Q. A steel column of rectangular section (15 mm × 10 mm) and length 1.5 m is simply supported at both ends. Assuming modulus of elasticity, E = 200 GPa for steel, the critical axial load (in kN) is (correct to two decimal places). Ans: 1.00 – 1.20
Q. A six-faced fair dice is rolled five times. The probability (in %) of obtaining “ONE” at least four times is (A) 33.3 (B) 3.33 (C) 0.33 (D) 0.0033 Ans: 0.33
Q. The number of atoms per unit cell and the number of slip systems, respectively, for a face- centered cubic (FCC) crystal are (A) 3, 3 (B) 3, 12 (C) 4, 12 (D) 4, 48 Ans: 4, 12
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Q. The time series forecasting method that gives equal weightage to each of the m most recent observations is (A) Moving average method (B) Exponential smoothing with linear trend (C) Triple Exponential smoothing (D) Kalman Filter Ans: Moving average Method
Q. Interpolator in a CNC machine A. controls spindle speed B. coordinates axes movements C. operates tool changer D. commands canned cycle Ans: coordinate feed rates of axes
Q. A grinding ratio of 200 implies that the A. grinding wheel wears 200 times the volume of the material removed B. grinding wheel wears 0.005 times the volume of the material removed C. aspect ratio of abrasive particles used in the grinding wheel is 200 D. ratio of volume of abrasive particle to that
Q. Using the Taylor’s tool life equation with exponent n = 0.5, if the cutting speed is reduced by 50%, the ratio of new tool life to original tool life is (A) 4 (B) 2 (C) 1 (D) 0.5 Ans: 4 Sol:
Q. The type of weld represented by the shaded region in the figure is (A) groove (B) spot (C) fillet (D) plug Ans: fillet
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Q. In a linearly hardening plastic material, the true stress beyond initial yielding A. increases linearly with the true strain B. decreases linearly with the true strain C. first increases linearly and then decreases linearly with the true strain D. remains constant Ans: increases linearly with the true strain
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