A. Grain size
B. Fatigue limit
C. Surface hardness
D. Wear resistance
✅ The correct answer is option A.
Engineering MCQs
Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then
A. It will deliver low discharge of liquid
B. Its efficiency will not be affected
C. It will not develop sufficient head to raise water
D. It will be cavitated
✅ The correct answer is option B.
With increase in steam pressure, its specific volume decreases
A. Rapidly first and then slowly
B. Linearly
C. Slowly first and then rapidly
D. Exponentially
✅ The correct answer is option A.
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.
A. Film
B. Nucleate
C. Transition
D. All of the above
✅ The correct answer is option D.
An oxidation process is accompanied with decrease in the
A. Number of electrons
B. Oxidation number
C. Number of ions
D. All of the above
✅ The correct answer is option A.
__________ can replace tungsten in high speed steel.
A. Chromium
B. Vanadium
C. Cobalt
D. Molybdenum
✅ The correct answer is option D.
Materials having __________ lattice structure are usually the most ductile.
A. Body centred cubic (bcc)
B. Hexagonal close packed (hcp)
C. Face centred cubic (fcc)
D. None of these
✅ The correct answer is option C.
The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.
A. 100
B. 200
C. 1000
D. 2000
✅ The correct answer is option B.
__________ of air does not increase with increase in temperature.
A. Density
B. Thermal diffusivity
C. Viscosity
D. Thermal conductivity
✅ The correct answer is option A.
During brazing, if the fluxes are entrapped, it results in the
A. Distortion of brazed joints
B. Cracking of joints
C. Presence of gas pockets
D. Corrosion
✅ The correct answer is option D.