Tiêu đề JUNIOR ENGINEERS (MECHANICAL) IN THE DEPARTMENT OF WATER RESOURCE QP 2.pdf ✅

JE (Mechanical) 2021 ( A – 2 ) SECTION A 1. The length in isometric drawing of line is 25 cm. What is the true length of it ? (a) 33·77 cm (b) 32·45 cm (c) 30·68 cm (d) 24·53 cm 2. What type of material is Gold ? (a) Ferroelectric (b) Ferromagnetic (c) Diamagnetic (d) Paramagnetic 3. Austenite decomposes into ferrite and cementite at a temperature of (a) 727 C (b) 1148 C (c) 1495 C (d) 1539 C 4. A steel with 0·8% carbon and 100% pearlite is called (a) Eutectoid steel (b) Hypo-eutectoid steel (c) Hyper eutectoid steel (d) Pro-eutectoid steel 5. Brass is an alloy of (a) Copper and Zinc (b) Copper and Tin (c) Copper, Tin and Zinc (d) None of the above 6. Zn and Mg have the following crystal structure (a) B.C.C. (b) F.C.C. (c) Diamond Cubic (d) H.C.P 7. A block of mass m rests on an inclined plane and is attached by a string to the wall as shown in the figure. The coefficient of static friction between the plane and the block is 0·5. The string can withstand a maximum force of 30 N. What is the maximum value of mass (m) for which the string will not break and the block will be in static equilibrium ? cos θ = 0.8, sin θ = 0·6, g = 10 m/s2 . (a) 5 kg (b) 10 kg (c) 15 kg (d) 20 kg