GATE PI topic:manufacturing PYQs & Answers — Page 19

Questions 181–190 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 19 of 65

A flat belt drive with pulley of

cm radius is designed to transmit 6.283 kW power at 600 RPM. In the figure,

is the corresponding torque. If the coefficient of static friction between the belt and the pulley is 0.3, then the minimum value of the tightening force

(in kN) required to prevent the belt slip is ________. (Rounded off to 2 decimal places)

Diagram for Production and Industrial Engineering question 51

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Mild steel plates are welded to make butt joints by arc weld with 85% heat transfer efficiency ignoring other losses. The first weld joint is made by selecting arc voltage of 30 V and current of 180 A with a welding speed of 6 mm/s. Using identical plates, a second weld joint is made with the same arc voltage and a welding speed of 8 mm/s. If both the welds have the same heat input, then the welding current (in A) for the second weld joint is ________. (Answer in integer)

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In a single pass cold rolling operation, a flat plate is reduced to a thickness of 3 mm. In this operation, two rolls of diameter 400 mm each are rotating in opposite direction at 300 RPM, and the elastic deflection of these rolls is negligible. The angle of bite is 10°. If the neutral point is present at an angle of 7° from the exit side, then the thickness of the plate (in mm) at the neutral point is ________. (Rounded off to 1 decimal place)

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In a sand mold, a sprue of height

mm is to be provided for maintaining the molten metal flow rate of

/s. The height of liquid column above the point 2 is kept constant at

mm. The cross-sectional areas of the sprue at points 2 and 3 are

and

, respectively. The points 1 and 3 are at the atmospheric pressure. Assuming the gauge pressure at point 2 to be zero as the limiting case to prevent aspiration effect, the ratio

is ________. (Rounded off to 2 decimal places)

Diagram for Production and Industrial Engineering question 54

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The following data are given in relation to turning operation of a cylindrical workpiece.

Diameter of the workpiece = 160 mm, length of the workpiece = 190 mm, cutting velocity =

m/min, and tool feed = 0.2 mm/rev.

Assuming the approach and the overrun of the tool to be 5 mm each, the machining time (in minutes) is ________. (Answer in integer)

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A CNC milling operation is carried out by moving the tool from the point A to point B in anti-clockwise direction to cut a slot of quarter circle with center at C, as shown. The coordinates of the points A and B are (0,0) and (10,10), respectively. All dimensions are in mm. If the feed rate at point P along x-axis is 6 mm/min, then the feed rate (in mm/min) at point P along y-axis is ________. (Rounded off to 1 decimal place)

Diagram for Production and Industrial Engineering question 56

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The pitch of a metric screw thread is calculated from pitch circle diameter measurement through two-wire method. If the thread is single-start with calculated pitch of 1.4 mm then the diameter (in mm) of the best-wire is ________. (Rounded off to 2 decimal places)

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During orthogonal turning, the cutting speed, feed and depth of cut are set as 2 m/s, 0.2 mm/rev and 2 mm, respectively. The specific cutting energy (neglecting the effect of feed force on the total cutting power) is 2 J/mm

. The main cutting force (in N) is ________. (Answer in integer)

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Electro-chemical machining is performed on a flat copper workpiece. If the material removal rate is 2 cm

/min throughout the process, then the required current (in A) is ________. (Rounded off to 1 decimal place)

Copper properties: Melting point = 1085 °C, density = 9 g/cm

, gram atomic weight = 63, and valency of dissolution = 2

Faraday’s constant = 96500 C Stefan-Boltzmann constant = 5.67 × 10

W·m

·K

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A repairable machine operated for 2400 hours in a year and for that year the machine broke down 8 times. The mean time to repair including waiting time is found to be 20 hours for that year.

If the mean time to repair including waiting time could have been reduced to 10 hours for that year, then the improvement in the availability of that machine would be ________ %. (Rounded off to 2 decimal places)

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GATE PI topic:manufacturing PYQs

Question 51

Question 52

Question 53

Question 54

Question 55

Question 56

Question 57

Question 58

Question 59

Question 60