A. A fine, highly dislocated and strong martensite
B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc
C. Fine dispersions of alloy carbides in a ferrite matrix
D. Fine dispersions of Fe3 C nucleated on dislocations in austenite
Related Mcqs:
- Secondary hardening in steels arises out of the _____________________?
A. Precipitation of fine alloy carbides at high temperatures
B. Refinement of ferrite grain size by working
C. Decomposition of retained austenite upon heat treatment
D. Precipitation of complex inter-metallic upon heat treatment - Yield strength of a material is determined by the __________________ test?
A. Creep
B. Tension
C. Compression
D. Endurance - Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils ?
A. Elaiden test
B. Reichert-Meissl value test
C. Hunter value test
D. Iodine value test - Which of the following is not a common refrigerant ?
A. Freon-12
B. Ethylene
C. Ammonia
D. Carbon dioxide - In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of ‘n’ is_________________?
A. 0
B. 1
C. y = 1.44
D. 1.66 - Which of the following equations is used for the prediction of activity co-efficient from experiments ?
A. Van Laar equation
B. Margules equation
C. Wilson’s equation
D. All A, B. and C - Which of the following has the minimum value of COP for a given refrigeration effect ?
A. Reverse Carnot cycle
B. Ordinary vapour-compression cycle
C. Vapour-compression process with a reversible expansion engine
D. Air refrigeration cycle - According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?
A. No component is concentrated at the surface of the solution
B. The component molecules are non polar and are of almost equal size
C. In the formation of solution, chemical combination/molecular association between unlike
molecules takes place
D. The attractive forces between like and unlike molecules are almost equal - In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ?
A. 30 c.c acid and 30 c.c base
B. 20 c.c acid and 25 c.c base
C. 15 c.c acid and 35 c.c base
D. 35 c.c acid and 15 c.c base - Which of the following is a type of sedimentary rock?
A. Organic rock
B. Chemical rock
C. Clastic rock
D. All of the aboveSubmitted by: Sajjad Ali Tagar
