Mechanical Engineering Gate 2017 Set-1 Questions with Answer

Ques 40 GATE 2017 SET-1

In an arc welding process, welding speed is doubled. Assuming all other process parameters to be constant, the cross sectional area of the weld bead will

Ques 41 GATE 2017 SET-1

Metric thread of 0.8 mm pitch is to be cut on a lathe. Pitch of the lead screw is 1.5 mm. If the spindle rotates at 1500 rpm, the speed of rotation of the lead screw (rpm) will be ________.

Ques 42 GATE 2017 SET-1

A 10 mm deep cylindrical cup with diameter of 15 mm is drawn from a circular blank. Neglecting the variation in the sheet thickness, the diameter (upto 2 decimal points accuracy) of the blank is ________ mm.

Ques 43 GATE 2017 SET-1

Circular arc on a part profile is being machined on a vertical CNC milling machine. CNC part program using metric units with absolute dimensions is listed below:
N60 G01 X 30 Y 55 Z-5 F50
N70 G02 X 50 Y 35 R 20
N80 G01 Z5
The coordinates of the centre of the circular arc are:

Ques 44 GATE 2017 SET-1

A block of length 200 mm is machined by a slab milling cutter 34 mm in diameter. The depth of cut and table feed are set at 2 mm and 18 mm/minute, respectively. Considering the approach and the over travel of the cutter to be same, the minimum estimated machining time per pass is ________ minutes.

Ques 45 GATE 2017 SET-1

A sprue in a sand mould has a top diameter of 20 mm and height of 200 mm. The velocity of the molten metal at the entry of the sprue is 0.5 m/s. Assume acceleration due to gravity as 9.8 m/s² and neglect all losses. If the mould is well ventilated, the velocity (upto 3 decimal points accuracy) of the molten metal at the bottom of the sprue is ________ m/s.

Ques 46 GATE 2017 SET-1

Two cutting tools with tool life equations given below are being compared:
Tool 1: VT^0.1 = 150
Tool 2: VT^0.3 = 300
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.

Ques 47 GATE 2017 SET-1

In the engineering stress-strain curve for mild steel, the Ultimate Tensile Strength (UTS) refers to

Ques 48 GATE 2017 SET-1

Assume that the surface roughness profile is triangular as shown schematically in the figure. If the peak to valley height is 20μm, the central line average surface roughness R_a (in μm) is

Ques 49 GATE 2017 SET-1

Two models, P and Q, of a product earn profits of Rs. 100 and Rs. 80 per piece, respectively. Production times for P and Q are 5 hours and 3 hours, respectively, while the total production time available is 150 hours. For a total batch size of 40, to maximize profit, the number of units of P to be produced is ________.

Ques 50 GATE 2017 SET-1

The Poisson's ratio for a perfectly incompressible linear elastic material is

Ques 51 GATE 2017 SET-1

Consider a beam with circular cross-section of diameter d. The ratio of the second moment of area about the neutral axis to the section modulus of the area is

Ques 52 GATE 2017 SET-1

An initially stress-free massless elastic beam of length L and circular cross-section with diameter d (d << L) is held fixed between two walls as shown. The beam material has Young's modulus E and coefficient of thermal expansion α. If the beam is slowly and uniformly heated, the temperature rise required to cause the beam to buckle is proportional to