GATE ME 1989 | GATE ME Year Wise Previous Years Questions

GATE ME 1989

MCQ (Single Correct Answer)

-0.6

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 $$56.36$$ $$N.m.$$ If the ratio of speed reduction in this unit is $$10:1,$$ the efficiency is about

$$78\% $$

$$85\% $$

$$63\% $$

$$96\% $$

GATE ME 1989

MCQ (Single Correct Answer)

-0.3

Modern gear both profile is given involute shape because

this is a very easy curve for manufacturing

sliding does not takes place anywhere on meshing teeth

involute is the only profile that gives conjugate action

change in the centre distance does not change gear ratio

GATE ME 1989

MCQ (Single Correct Answer)

-0.3

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

in ductile material local yielding may distribute stress concentration

ductile material has larger Young's materials.

Poisson's ratio is larger in ductile materials.

Modulus of rigidity is larger in ductile materials.

GATE ME 1989

MCQ (Single Correct Answer)

-0.3

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

$$S673$$

$$S730$$

$$S630$$

$$S037$$

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