ISRO SC/ENG 2008

 1) The ultimate strength and yield strength of most of the metals, when temperature falls from 0 to -150⁰C will

A. Increase
B. Decrease
C. Remain same
D. First increase and then decrease

 2) Troosite is obtained when

A. Quenching steel during transformation
B. A fully hardened steel is finally drawn at about 677⁰C
C. Steel is rapidly quenched in oil
D. When alloy steels are rapidly quenched in water

 3) Induction hardenening is the process of

A. Hardening the core
B. Uniform hardeningp
C. Selective hardening
D. Hardening surface for wear resistance

 4) Which one is not the purpose of heat treatment of steels

A. Changing the composition of steel on the surface
B. Changing the percentage of carbon and Si in the bulk
C. Increasing or decreasing the grain size
D. Removing undesirable residual stresses

 5) A cold chisel is made of

A. mild steel
B. Cast iron
C. H.S.S
D. High carbon

 6) A body which is permanently deformed is said to have undergone

A. Elastic deformation
B. Limit of elastic deformation
C. Plastic deformation
D. Uniform deformation

 7) The defect responsible for the phenomena of slip, by which most metals deform plastically, is known is

A. Fracture
B. Twinning
C. Dislocation
D. Strain hardening

 8) On loading a ductile material in excess of a certain value, gradual increase in elongation occurs with time. Such phenomenon is known as

A. Creep
B. Fatigue
C. Stress concentration
D. None of the above

 9) The function of washer is

A. To fill the axial gap
B. To provide cushioning effect
C. To absorb shocks and vibrations
D. To provide bearing area

 10) Rivets are made of

A. Soft material
B. Hard material
C. Ductile material
D. Brittle material

 11) What is thee correct sequence of th following parameters in order of their maximum to minimum influence on tool life?
1. Feed rate
2. Depth of cut
3. Cutting speed
Select the correct answer using the codes given below

A. 1,2,3
B. 3,2,1
C. 2,3,1
D. 3,1,2

 12) Given that cutting speed = 9m/min, the return time to cutting time ratio is 1:2 the feed rate = 0.3 mm/stroke, the clearance at each of cut= 25 mm and that the plate is fixed 700 mm side along the direction of tool travel, the time required for finishing one flat surface of a plate of size 700 x 300 mm in a shaper, will be

A. 10 min
B. 12.5 min
C. 15 min
D. 20 min

 13) For achieving a specific surface finish in single point turning the most important factor to be controlled is

A. Depth of cut
B. Cutting speed
C. Feed
D. Tool rake angle

 14) Enlarging an existing circular hole with rotating single point tool is called

A. Boaring
B. Drilling
C. Reaming
D. Internal turning