GATE 2019: Manufacturing Rapid Revision Quiz for ESE & GATE ME Exams

Question 1

Which of the following is one of the advantage of tempering ?

Question 2

Match items from groups I, II and III:
Group-I (Structure)
A) Simple cubic
B) Body centered
C) Face centered
D) Hexagonal closed packed
Group-II (Effective no. of atoms)
P) 2
Q) 1
R) 4
S) 6
Group-III (Co-ordination No.)
T) 8
U) 6
W) 12

Question 3

The welding process which uses a blanket of fusible granular flux is

Question 4

Mould having dimensions

is filled with molten metal through a bottom gate with height 50 mm and area of gate 150 mm². The mould filling time is _____ seconds.
[Take,

]

Question 5

Assertion A : Reducing cutting force reduces the cutting power requirement.
Reason R : Negative rake helps to increase life of the tool.

Question 6

Following parameters are given for a MIG welding

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The area of cross-section of weld bead in mm² is __________.

Question 7

A mould has a downsprue whose length is 20 cm and the cross sectional area at the base of the downsprue is 1 cm2. The downsprue feeds a horizontal runner leading into the mould cavity of volume 1000 cm3. The time required to fill the mould cavity will be

Question 8

Through holes of 10 mm diameter are to be drilled in a steel plate of 20 mm thickness. Drill spindle speed is 300 rpm, feed 0.2 mm/rev and drill point angle is 120⁰. Assuming drill over travel of 2 mm, the time for producing a hole will be

Question 9

For tool A, Taylor’s tool life exponent (n) is 0.45 and constant (K) is 90. Similarly for tool B, n=0.3 and K=60. The cutting speed (in m/min) above which tool A will have a higher tool life than tool B is

Question 10

Which among the following is NOT the characteristics of non-traditional machine process _________?

Question 11

Orthogonal turning is performed on a cylindrical workpiece with shear strength of 250 MPa. The following conditions are used: cutting velocity is 180 m/min, feed is 0.20 mm/rev, depth of cut is 3 mm, chip thickness ration = 0.5. The orthogonal rake angle is 7 °. Apply Merchant’s theory for analysis.

The shear plane angle (in degrees) and the shear force respectively are

Question 12

Match the items in Column I and Column II.

Question 13

In a single pass rolling operation, a 20 mm thick plate with plate width of 100 mm, is reduced to 18 mm. The roller radius is 250 mm and rotational speed is 10 rpm. The average flow stress for the late material is 300 MPa. The power required for the rolling operation in kW is closest to

Question 14

Two cutting tools with tool life equations given below are being compared:
Tool 1:

Tool 2:

Where V is cutting speed in m/minute and T is tool life in minutes. The breakeven cutting speed beyond which Tool 2 will have a higher tool life is ________ m/minute.

Question 15

During a steady-state gas metal arc welding with direct current electrode positive, the welding current, voltage and welding speed are 150A, 30V, 6 m/min. A metallic wire electrode of diameter 1.2 mm is being feed at a constant rate of 12 m/min. The density, specific heat, and melting temperature of the wire electrode are 7000 kg/m³, 500 J/kg, 1530 °C. Assuming ambient to be 30 °C and neglect latent heat of melting, further consider that (2/3)^rdof the total electrical power is available for melting. The melting efficiency of the wire electrode (%) is