421. The co-ordination number in simple cubic structure is
A. 4
B. 6
C. 8
D. 12
✅ The correct answer is option B.
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.
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.
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.
431. Which of the following is a synthetic abrasive ?
A. Corundum
B. Emery
C. Pumice
D. Silicon carbide
✅ The correct answer is option D.
434. On-off control
A. Fully opens the final control element, when the measured variable is below the set point
B. Fully closes the final control element, when the measured variable is above the set point
C. Is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag
D. None of these
✅ The correct answer is option C.
437. The most important requirement for aluminium industry is the availability of cheap
A. Ore
B. Electrical power
C. Labour
D. & abundant water
✅ The correct answer is option B.
440. Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
A. Manganese
B. Phosphorous
C. Magnesium
D. Chromium
✅ The correct answer is option C.
443. The material used for coating the welding electrode is termed as the
A. Flux
B. Slag
C. Protective layer
D. Binder
✅ The correct answer is option B.
446. Young’s modulus of a material is the measure of its
A. Stiffness
B. Malleability
C. Creep resistance
D. Tensile strength
✅ The correct answer is option A.