883. The entropy change for a spontaneous process is
A. > 0 for the system
B. < 0 for the system
C. > 0 for the system & the surrounding
D. < 0 for the system & the surrounding
✅ The correct answer is option D.
886. Pick the odd man out of the following.
A. Calorising
B. Pack carburising
C. Nitriding
D. Cyaniding
✅ The correct answer is option A.
889. Case hardening is not done by
A. Nitriding
B. Hot dipping
C. Electroplating
D. Both B & C
✅ The correct answer is option D.
891. Lead is poured into the joint between two- __________ pipes.
A. Mild steel
B. Concrete
C. Cast iron
D. Asbestos cement
✅ The correct answer is option C.
893. Alloys having more than 80% copper are generally more
A. Abrasion resistant
B. Corrosion resistant
C. Prone to season cracking
D. Machinable
✅ The correct answer is option B.
895. Nickel is a __________ material.
A. Ferromagnetic
B. Semi-conductor
C. Paramagnetic
D. Ferroelectric
✅ The correct answer is option A.
857. Flywheel is provided in a machine to
A. Provide structural strength to the shaft
B. Smoothen the power impluses
C. Help in quick starting of the machine
D. None of these
✅ The correct answer is option B.
859. ‘Ice point’ is designated on Farenhite temperature scale by
A. 0°
B. 32°
C. 62°
D. 212°
✅ The correct answer is option B.
861. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.
A. Enthalpy
B. Relative humidity
C. Wet bulb temperature
D. Dew point temperature
✅ The correct answer is option D.
863. Vernier calipers can not be used to measure the
A. I.D. & O.D. of the shaft
B. Thickness of parts
C. Depth of holes
D. Clearance between two mating surfaces
✅ The correct answer is option D.