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
The type of weld represented by the shaded region in the figure is Read More »
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
In a linearly hardening plastic material, the true stress beyond initial yielding Read More »
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.
Which one of the following statements is correct for a superheated vapour? Read More »
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
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
The equation of motion for a spring-mass system excited by a harmonic force is Read More »
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
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
Q. A multi-mode optical fiber with a large core diameter has a core refractive index 𝑛1 = 1.5 and cladding refractive index 𝑛2 = 1.4142. The maximum value of 𝜃𝐴 (in degrees) for which the incident light from air will be guided in the optical fiber is ± . Ans: 29-31
Q. A Michelson Interferometer using a laser source of wavelength 𝜆0 = 500 nm, with both the mirrors (𝑀1& 𝑀2) fixed and positioned equidistant from the splitter/combiner is shown in the figure. When a dielectric plate of refractive index 𝑛 = 1.5, of thickness 𝒕 , is placed in front of the mirror 𝑀2 ,
A Michelson Interferometer using a laser source of wavelength 𝜆0 = 500 nm Read More »
