GATE 1989 Mechanical Engineering

The cutting tool are being tried for an operation. Tailors tool life equation for them are as follows $$\eqalign{ & HSS\,\,tool\,:\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,V{T^{0.1}} = 200 \cr...

Modern gear both profile is given involute shape because

Minimum dimensional and form accuracy can be obtained in the cylinder bores of automobile engines if the bores are finished by

Chills are used in molds to

A $$400m$$ long horizontal pipe is to deliver $$900$$ kg of oil $$\left( {S = 0.9,\,\,\upsilon = 0.0002{m^2}/s} \right)$$ per minute. If the head loss is not to exceed $$8$$ $$m$$...

In order to test the efficiency of reducer gear train $$1kW$$ input was given at the input end at a speed of $$1440$$ $$rpm$$ and at the output end the measured torque was $$56.36$...

Increase in water content in moding sand causes

Appropriate instrument to check the flatness of slip gage is

Teeth of internal spur gears can be accurately cut in a

Gear hobbing produces more accurate gears than milling because in hobbing

In an orthogonal cutting test on the following data were obtained Uncut chip thickness $$=0.25mm,$$ Cutting speed: $$60m/min,$$ Tool rake angle: $$0$$ Chip thickness $$0.75mm,$$ Cu...

Stress concentration in a machine component of a ductile material is not so harmful as it is in a brittle material because

In an ideal inventory control system, the economic lot size for a part is $$1000.$$ If the annual demand for the part is doubled, the new economic lot size required will be:

The size of $$BLUE$$ in metal cutting increases with

In turning operation the feed rate could be doubled to increase the metal removal rate To keep the same level of surface finish, the nose radius of the tool has to be

The fundamental objective of employing the condenser in a steam power plant is to (reducce / increase ) the ______________of steam

A economizer in a steam generator performs the function of

The stream function in a two dimensional flow field is given by $$\Psi = {x^2} - {y^2}$$ The magnitude of the velocity at point $$(1,1)$$ is

The total efficiency, $${\eta _t}$$ for a finned surface may be defined as the ratio of the total heat transferred by the combined area of the fins, $${A_r},$$ and the exposed surf...

Two cubical castings of the same metal and sizes of $$2cm$$ side and $$4cm$$ side are moulded in green sand. If the smaller casting solidifies in $$2mins,$$ the expected time of so...

Two black plates, each one meter square, are placed parallel to each other in such a way that the radiation shape factor for the system is $$0.4.$$ If the plates are maintained at...

Which of the following is a technique for forecasting?

Crater wear always starts at some distance from the tool tip because at that point

In $$NC$$ part programming spindle speed of $$730rpm$$ will be coded by the magic - $$3$$ rule as

The heat transfer process between a body and its ambient is governed by an internal conductive resistance $$\left( {{\rm I}CR} \right)$$ and an external convective resistance $$(EC...

An arc welding $$DC$$ power source has a linear power source characteristic with open circuit voltage $${V_O} = \,\,80$$ volts and short circuit current $${{\rm I}_S} = 1000amps.$$...

A cylindrical elastic body subjected to pure torsion about its axis develops:

For a simply supporting beam on two end supports the Bending Moment is maximum:

An elastic body is subjected to a tensile stress $$X$$ in a particular direction and a compressive stress $$Y$$ in its perpendicular direction. $$X$$ and $$Y$$ are unequal in magni...