Interpolator in a CNC machine
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
A grinding ratio of 200 implies that the
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
Using the Taylor’s tool life equation with exponent n = 0.5, if the cutting speed is reduced by 50%
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:
The type of weld represented by the shaded region in the figure is
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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In a linearly hardening plastic material, the true stress beyond initial yielding
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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Which one of the following statements is correct for a superheated vapour?
Q. Which one of the following statements is correct for a superheated vapour? A. Its pressure is less than the saturation pressure at a given temperature. B. Its temperature is less than the saturation temperature at a given pressure. C. Its volume is less than the volume of the saturated vapour at a given temperature.
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For an Oldham coupling used between two shafts, which among the following statements are correct?
Q. For an Oldham coupling used between two shafts, which among the following statements are correct? (A) I and III (B) I and IV (C) II and III (D) II and IV Ans: I and IV
The equation of motion for a spring-mass system excited by a harmonic force is
Q. The equation of motion for a spring-mass system excited by a harmonic force is where M is the mass, K is the spring stiffness, F is the force amplitude and w is the angular frequency of excitation. Resonance occurs when w is equal to Ans: Option D
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A bar of uniform cross section and weighing 100 N is held horizontally using two massless and inextensible
Q. A bar of uniform cross section and weighing 100 N is held horizontally using two massless and inextensible strings S1 and S2 as shown in the figure. The tensions in the strings are Ans: T1 = 0 N and T2 = 100 N
Four red balls, four green balls and four blue balls are put in a box. Three balls are pulled out of
Q. Four red balls, four green balls and four blue balls are put in a box. Three balls are pulled out of the box at random one after another without replacement. The probability that all the three balls are red is (A) 1/72 (B) 1/55 (C) 1/36 (D) 1/27 Ans: 1/55