Q. A hollow circular shaft of inner radius 10 mm, outer radius 20 mm and length 1 m is to be used as a torsional spring. If the shear modulus of the material of the shaft is 150 GPa, the torsional stiffness of the shaft (in kN-m/rad) is____________(correct to two decimal places). Ans: 35.343 Sol:
Q. A local tyre distributor expects to sell approximately 9600 steel belted radial tyres next year. Annual carrying cost is Rs. 16 per tyre and ordering cost is Rs. 75. The economic order quantity of the tyres is (A) 64 (B) 212 (C) 300 (D) 1200 Ans: 300
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
The preferred option for holding an odd-shaped workpiece in a centre lathe is Read More »
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.
Metal removal in electric discharge machining takes place through Read More »
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
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
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.
