Previous Year Manufacturing Science Objective Questions

16. In forging operation fullering is done to-

A. draw out the material

B. upset the material

C. extrude the material

D. bend the material

Click for Answer/Explanation

Correct Answer is A

17. Scab is a-

A. sand casting defect

B. machining defect

C. forging defect

D. welding defect

Click for Answer/Explanation

Correct Answer is A

It refers to the rough, thin layer of a material protruding above the casting surfaces.

18. In which one of the following welding techniques, a vacuum environment is needed-

A. Electron beam welding

B. Plasma arc welding

C. Ultrasonic welding

D. Laser beam welding

Click for Answer/Explanation

Correct Answer is A

If not done in vacuum electrons will collide with air particles and will lose their velocity and hence kinetic energy.

19. Which one of these is not a feature of gear hobbing process

A. Very accurate tooth profile

B. High rate of production

C. Generation of internal gears

D. Generation of helical gears

Click for Answer/Explanation

Correct Answer is C

Rest of the options given are the Advantages

20. In a machining operation, the chip thickness ratio is 0.3 and the back rake angle of the tool is 10°. Find the value of shear strain?

A. 0.86

B. 1.34

C. 2.33

D. 3.34

Click for Answer/Explanation

Correct Answer is D

Using the formula-

Shear strain = cot F + tan(F – a)

Find the value of F by-

tan F = (r × cos a)/(1 – r × sin a) ; Here r = ratio = 0.3 (given)

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Manufacturing Science: Previous Years’ Objective Questions