Mechanical Gate Subject

Aptitude and Reasoning Engineering Mathematics Engineering Mechanics Manufacturing Thermodynamics Industrial Engineering Material Science Vibrations Machine Theory Heat Transfer Strength of Material

Manufacturing Mechanical previous year questions with answer

1 2 3 4 5 6 7 8 9 10

Ques 41 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.

2.05 is the correct answer.

Ques 42 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.

106 is the correct answer.

Ques 43 GATE 2016 SET-3

Equal amounts of a liquid metal at the same temperature are poured into three moulds made of steel, copper and aluminum. The shape of the cavity is a cylinder with 15 mm diameter. The size of the moulds are such that the outside temperature of the moulds do not increase appreciably beyond the atmospheric temperature during solidification. The sequence of solidification in the mould from the fastest to slowest is
(Thermal conductivities of steel, copper and aluminum are 60.5, 401 and 237 W/m-K, respectively. Specific heats of steel, copper and aluminum are 434, 385 and 903 J/kg-K, respectively. Densities of steel, copper and aluminum are 7854, 8933 and 2700 kg/m³, respectively.)

Copper - Steel - Aluminum

Aluminum - Steel - Copper

Copper - Aluminum - Steel

Steel - Copper - Aluminum

Ques 44 GATE 2016 SET-3

In a wire-cut EDM process the necessary conditions that have to be met for making a successful cut are that

wire and sample are electrically non-conducting

wire and sample are electrically conducting

wire is electrically conducting and sample is electrically non-conducting

sample is electrically conducting and wire is electrically non-conducting

Ques 45 GATE 2016 SET-3

Internal gears are manufactured by

hobbing

shaping with pinion cutter

shaping with rack cutter

milling

Ques 46 GATE 2016 SET-3

Match the following part programming codes with their respective functions

Part Programming Codes	Functions
P. G01	I. Spindle stop
Q. G03	II. Spindle rotation, clockwise
R. M03	III. Circular interpolation, anticlockwise
S. M05	IV. Linear interpolation

P-II, Q-I, R-IV, S-III

P-IV, Q-II, R-III, S-I

P-IV, Q-III, R-II, S-I

P-III, Q-IV, R-I, S-II

Ques 47 GATE 2016 SET-2

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

tungsten inert gas welding

submerged arc welding

electroslag welding

thermit welding

Ques 48 GATE 2016 SET-2

The value of true strain produced in compressing a cylinder to half its original length is

0.69

-0.69

0.5

-0.5

Ques 49 GATE 2016 SET-2

The following data is applicable for a turning operation. The length of job is 900 mm, diameter of job is 200 mm, feed rate is 0.25 mm/rev and optimum cutting speed is 300 m/min. The machining time (in min) is ________.

7.54 is the correct answer.

Ques 50 GATE 2016 SET-2

In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. With increasing feed force, the MRR exhibits the following behavior:

increases linearly

decreases linearly

does not change

first increases and then decreases