Q. The preferred option for holding an odd-shaped workpiece in a centre lathe is (A) live and dead centres (B) three jaw chuck (C) lathe dog (D) four jaw chuck Ans: four jaw chuck
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Q. Metal removal in electric discharge machining takes place through A. ion displacement B. melting and vaporization C. corrosive reaction D. plastic shear Ans: melting and vaporization Sol: In EDM, electric spark is the source due to which material undergoes fusion and vaporization.
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Q. Feed rate in slab milling operation is equal to A. rotation per minute (rpm) B. product of rpm and number of teeth in the cutter C. product of rpm, feed per tooth and number of teeth in the cutter D. product of rpm, feed per tooth and number of teeth in contact Ans: product
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Q. During solidification of a pure molten metal, the grains in the casting near the mould wall are A. coarse and randomly oriented B. fine and randomly oriented C. fine and ordered D. coarse and ordered Ans: fine and randomly oriented Sol: During solidification of pure metal at the surface of the mould due to
Q. Denoting L as liquid and M as solid in a phase-diagram with the subscripts representing different phases, a eutectoid reaction is described by A. M 1 → M 2 + M 3 B. L1 → M 1 + M 2 C. L1 + M 1 → M 2 D. M1 + M 2 → M 3 Ans: M 1 → M
Q. The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 µm. If the peak wavelength of emitted radiation changes to 2.90 µm, then the temperature (in K) of the black body is (A) 500 (B) 1000 (C) 4000 (D) 8000 Ans: 1000
Q. Pre-tensioning of a bolted joint is used to (A) strain harden the bolt head (B) decrease stiffness of the bolted joint (C) increase stiffness of the bolted joint (D) prevent yielding of the thread root Ans: increase stiffness of the bolted joint
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Q. In a single degree of freedom underdamped spring-mass-damper system as shown in the figure, an additional damper is added in parallel such that the system still remains underdamped. Which one of the following statements is ALWAYS true? A. Transmissibility will increase. B. Transmissibility will decrease. C. Time period of free oscillations will increase. D.
Q. A frictionless gear train is shown in the figure. The leftmost 12-teeth gear is given a torque of 100 N-m. The output torque from the 60-teeth gear on the right in N-m is (A) 5 (B) 20 (C) 500 (D) 2000 Ans: 2000
Q. An electrochemical machining (ECM) is to be used to cut a through hole into a 12 mm thick aluminum plate. The hole has a rectangular cross-section, 10 mm × 30 mm. The ECM operation will be accomplished in 2 minutes, with efficiency of 90%. Assuming specific removal rate for aluminum as 3.44 × 10-2
