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Question on Friction, Welding and Milling Operation.

IRSME. Graduated in Mechanical engineering. Secured AIR 1 in ESE 2017. Believes in Quality Education for all.

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1. SOLUTION AND ANALYSIS OF ONE MARK QUESTIONS (IN HINDI) GRADUATE APTITUDE TEST IN ENGINEERING Forenoon Session BY: LOHIT KUMAR YADAV

2. ABOUT ME: Secured AIR 1 in ESE 2017. Appeared for ISRO, BARC, BEL, BPCL, IOCL Interviews 2 years professional experience AFSB Mysore, 2014 Educator on Unacademy since December, 2017 Hobbies: Reading Fictional Novels, Cooking, Playing Piano.

3. A block of mass 10 kg rests on a horizontal floor. The acceleration due to gravity is 9.81 m/s2. The coefficient of static friction between the floor and the block is o.2. A horizontal force of 10 N is applied on the block as shown in the figure. The magnitude of force of friction (in N) on the block is 10 N 10 kg

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5. Which one of the following welding methods provides the highest heat flux (W/mm2)? (a) Oxy-acetylene gas welding (b) Tungsten inert gas welding (c) Plasma arc welding (d) Laser beam welding

6. The length, width and thickness of a steel sample are 400 mm, 40 mm and 20 mm, respectively. Its thickness needs to be uniformly reduced by 2 mm in a single pass by using horizontal slab milling. The milling cutter (diameter: 100 mm, width: 50 mm) has 20 teeth and rotates at 120o rpm. The feed per tooth is o.o5 mm. The feed direction is along the length of the sample. If the over travel distance is the same as the approach distance, the approach distance and time taken to complete the required machining task are (a) 14 mm, 21.4 s (b) 21 mm, 39.4 s (c) 14 mm, 18.4 s (d) 21 mm, 28.9 s

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8. Cutter position at end of cut Cutter position at start of cut Feed (relative to work) work Side vievw

9. 2 N t =0, 356 min t = 21.4 sec