Most Important Mechanical Engineering Objective Interview Questions Part – 7
1. Seamless rings are made by the process
a) Super-plastic forming
b) Mandrel forging
c) Ring rolling
d) Diffusion bonding
Ans.: c) Ring rolling
2. Internal defects in material is detected by
a) Fluorescent penetrate check
b) Red dye check
c) Ultrasonic
d) Eddy current check
Ans.: c) Ultrasonic
3. Smaller the grains in steel
a) Higher the tensile strength
b) Higher the fatigue strength
c) Lower the creep
d) All the above
Ans.: a) Higher the tensile strength
4. Alloying element which lowers the hardenability in steel
a) Cobalt
b) Tungsten
c) Chromium
d) Aluminum
Ans.: d) Aluminum
5. Base element in Warp alloy is
a) Iron
b) Nickel
c) Cobalt
d) Aluminum
Ans.: b) Nickel
6. Glass bead peening on components done to
a) Improve creep strength
b) Improve fatigue strength
c) Improve finish
d) Impart further coating
Ans.: b) Improve fatigue strength
7. Forging is superior to casting due to
a) Better grain direction
b) Better flowability
c) Less internal defects
d) Higher strength
Ans.: a) Better grain direction
8. DOE in process control variance is
a) Department Of Energy
b) Design Of Experiments
c) Defects on external areas
d) None of the above
Ans.: b) Design Of Experiments
9. Strain rate is the lowest in
a) Hydraulic press
b) Counter blow hammers
c) Screw presses
d) Drop hammers
Ans.: c) Screw presses
10. Titanium is preferred in high pressure compressor blades due to
a) Higher strength
b) Lower density
c) High temperature strength
d) Higher strength to weight ratio
Ans.: d) Higher strength to weight ratio
11. Austenite is a combination of
a) Ferrite + austenite
b) ferrite+ cementite
c) Ferrite + graphite
d) cementite + gamma iron
Ans.: b) ferrite+ cementite
12. The unique property of cast iron
a) Malleability
b) Damping capacity
c) Hardness
d) Ductility
Ans.: b) Damping capacity
13. Charpy test is conducted to measure
a) Hardness
b) Fatigue resistance
c) Brittleness
d) Malleability
Ans.: c) Brittleness
14. Machinability of a metal depends on
a) Tensile strength
b) Hardness
c) Toughness
d) Both (a) & (b)
Ans.: d) Both (a) & (b)
15. For pure metals the recrystallization temperature is
a) 0.2Tm
b) 0.5Tm
c) 0.7Tm
d) 0.9Tm
Ans.: b) 0.5Tm
16. Impurity in the metal and alloy
a) Decreases the resistivity
b) Increases the resistivity
c) No effect
d) None of them
Ans.: b) Increases the resistivity
17. The increase in hardness due to cold working is called
a) cold hardening
b) hot hardening
c) work hardening
d) age hardening
Ans.: c) work hardening
18. Steel balls are manufactured by
a) casting
b) machining
c) sintering
d) spinning
Ans.: d) spinning
19. The mould is housed in a
a) flask
b) cope
c) drag
d) cheek
Ans.: a) flask
20. Cores are used to
a) make desired shapes in the casting
b) strengthen moulding sand
c) support loose pieces
a) remove pattern easily
Ans.: a) make desired shapes in the casting