421. The co-ordination number in simple cubic structure is
A. 4
B. 6
C. 8
D. 12
✅ The correct answer is option B.
Engineering
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422. __________ wire is never used for making the heating element.
A. Nichrome
B. Kanthal
C. Invar
D. None of these
✅ The correct answer is option C.
423. In electrical resistance welding, distortion results from the use of improper
A. Clamping methods
B. Electrodes
C. Current
D. Filler material
✅ The correct answer is option A.
424. Babbit lining is used on brass/bronze bearings to increase the
A. Antifriction properties
B. Compressive strength
C. Bearing resistance
D. Wear resistance
✅ The correct answer is option D.
425. Prandtl mixing length in turbulent flow signifies the
A. Average distance perpendicular to the mean flow covered by the mixing particles
B. Wavelength corresponding to the lowest frequency present in the flow field
C. Ratio of mean free path to characteristic length of the flow field
D. Magnitude of turbulent kinetic energy
✅ The correct answer is option A.
426. Oxide layer formed on the non-ferrous metal surface after its annealing is
A. Removed by acid pickling
B. Hammered into the surface
C. Removed with coarse emery cloth
D. Left as such to protect the surface
✅ The correct answer is option A.
427. Which of the following is not an ore of zinc?
A. Cerrusite
B. Franklinite
C. Calamine
D. Troosite
✅ The correct answer is option A.
428. An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is
A. 0
B. 60
C. 30
D. 20
✅ The correct answer is option A.
429. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m² .k), when the insulation thickness is __________ mm.
A. 15
B. 25
C. 10
D. 30
✅ The correct answer is option B.
430. Addition of __________ in steel can help in increasing the depth of hardness.
A. Nickel
B. Chromium
C. Vanadium
D. Tungsten
✅ The correct answer is option C.