MCQs ESE Mechanical Engineering 

1. When an alloy solidifies over a range of temperature, the resulting casting structure is:
(a) Wholly equi-axed
(b) Wholly columnar
(c) Partially columnar partially equi-axed
(d) Dendritic 
Answer: (d)
2. Edge dislocation is a:
(a) Point imperfection
(b) Line imperfection
(c) Surface imperfection
(d) Volume imperfection 
Answer: (b)
3. In Eutectoid reaction a solid phase transforms into two other solid phases upon cooling. Which one of the following is correct in case of Eutectoid reaction occurring in Iron-Carbon phase diagram?
(a) Austenite converts to Ferrite and Cementite
(b) Ferrite converts to Cementite and Martensite
(c) Cementite converts to Austenite and Ferrite
(d) Martensite converts to Ferrite and Cementite 
Answer: (a)
4. Which of the following phase of steel is NOT present in Iron-Carbon phase diagram?
(a) Ferrite
(b) Cementite
(c) Austenite
(d) Martensite 
Answer: (d)
5. Line imperfection in a crystal is called
(a) Miller defect
(b) Frenkel defect
(c) Schottky defect
(d) Edge dislocation 
Answer: (d)
6. In queuing theory, the number of arrivals per unit time is estimated by
(a) Binomial distribution
(b) Poisson distribution
(c) Normal distribution
(d) Bath tub analogy 
Answer: (b)
7. Addition of which one of the following elements, shifts the lower critical temperature line in iron-iron carbide diagram towards the higher side?
(a) Chromium
(b) Nickel
(c) Molybdenum
(d) Aluminum 
Answer: (c)
8. Spheroidal or modular graphite iron is designated as SG 500/7. Here ‘500’ and ‘7’ stands for
(a) Proof stress in N/mm2 and elongation in %
(b) Tensile strength in N/mm2 and impact strength in N-m
(c) Tensile strength in N/mm2 and elongation in %
(d) Tensile strength in kg/mm2 and elongation in % 
Answer: (c)
9. Interstitial free steels are used for
(a) Forging crank shafts
(b) Making of car bodies
(c) Making of tall buildings
(d) Making of steel rails for high speed tractions 
Answer: (b)
10. When steel containing less than 0.85% carbon is cooled slowly below the lower critical point, it contains
(a) Ferrite mainly
(b) Pearlite mainly
(c) Ferrite and pearlite
(d) Pearlite and cementite 
Answer: (d)
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