397. The suction and delivery pressure for a two stage compressor are 1 and 25 atm respectively. The intermediate stage pressure would be around __________ atm.
A. 5
B. 10
C. 15
D. 20
✅ The correct answer is option A.
399. Which of the following is the most elastic material?
A. Plastic
B. Glass
C. Steel
D. Rubber
✅ The correct answer is option C.
401. The condition of diffraction from a crystal is given by
A. nλ = 2d Sin θ
B. λ = d Sin 2θ
C. λ = 2d Sin 2θ
D. nλ = d Sin θ
✅ The correct answer is option A.
403. The driving force for the sintering of a powder compact is
A. Strain energy
B. Surface energy
C. Volume energy
D. Stacking fault energy
✅ The correct answer is option B.
405. __________ is not used as the control rod material in a nuclear reactor.
A. Cobalt
B. Hafnium
C. Cadmium
D. Boron
✅ The correct answer is option A.
407. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
A. Cresylic acid
B. Xanthaies
C. Pine oil
D. All of the above
✅ The correct answer is option B.
409. Stellite is a __________ material.
A. Ferrous
B. Ceramic
C. Cemented carbide
D. Non ferrous cast alloy cutting tool
✅ The correct answer is option D.
412. The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be
A. 3171Pa
B. 3567Pa
C. 1.01 x 10⁵Pa
D. 5000Pa
✅ The correct answer is option B.
415. As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
A. 110
B. 85
C. 60
D. 45
✅ The correct answer is option B.
418. Current asset of a factory includes the
A. Goodwill of the company
B. Common stocks held by the company
C. Manufacturing plant & equipment
D. Inventory
✅ The correct answer is option C.