1
GATE ME 1989
MCQ (Single Correct Answer)
+1
-0.3
Stress concentration in a machine component of a ductile material is not so harmful as it is in a brittle material because
A
in ductile material local yielding may distribute stress concentration
B
ductile material has larger Young's materials.
C
Poisson's ratio is larger in ductile materials.
D
Modulus of rigidity is larger in ductile materials.
2
GATE ME 1989
MCQ (Single Correct Answer)
+1
-0.3
Modern gear both profile is given involute shape because
A
this is a very easy curve for manufacturing
B
sliding does not takes place anywhere on meshing teeth
C
involute is the only profile that gives conjugate action
D
change in the centre distance does not change gear ratio
3
GATE ME 1989
MCQ (Single Correct Answer)
+2
-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
A
$$78\% $$
B
$$85\% $$
C
$$63\% $$
D
$$96\% $$
4
GATE ME 1989
MCQ (Single Correct Answer)
+1
-0.3
Chills are used in molds to
A
achieve directional solidification
B
reduce possibility of blow holes
C
reduce the freezing time
D
smoothen the metal for reducing spatter.
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