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.
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
Q. Block P of mass 2 kg slides down the surface and has a speed 20 m/s at the lowest point, Q, where the local radius of curvature is 2 m as shown in the figure. Assuming g = 10 m/s2, the normal force (in N) at Q is_____________________(correct to two decimal places). Ans: 419.00
Block P of mass 2 kg slides down the surface and has a speed 20 m/s at the lowest Read More »
Q. The schematic of an external drum rotating clockwise engaging with a short shoe is shown in the figure. The shoe is mounted at point Y on a rigid lever XYZ hinged at point X. A force 𝐹 = 100 𝑁 is applied at the free end of the lever as shown. Given that the
Q. Processing times (including setup times) and due dates for six jobs waiting to be processed at a work centre are given in the table. The average tardiness (in days) using shortest processing time rule is____________________(correct to two decimal places). Job Processing time (days) Due date (days) A 3 8 B 7 16 C 4
Q. The minimum value of 3𝑥 + 5𝑦 such that: 3𝑥 + 5𝑦 ≤ 15 4𝑥 + 9𝑦 ≤ 8 13𝑥 + 2𝑦 ≤ 2 𝑥 ≥ 0, 𝑦 ≥ 0 is_________________. Ans: 0
Q. A bar is compressed to half of its original length. The magnitude of true strain produced in the deformed bar is_____________(correct to two decimal places). Ans:
