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.
Engineering MCQs
The ratio of the shear stress to the principal stress on a principal plane is
A. 0
B. 1
C. 1/2
D. 1/3
✅ The correct answer is option A.
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.
__________ has the highest melting point out of the following.
A. Tungsten
B. Zirconium
C. Molybdenum
D. Tantalum
✅ The correct answer is option A.
__________ 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.
Needles are produced by
A. Forging
B. Swaging
C. Extrusion
D. Machining
✅ The correct answer is option B.
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.
Fire refining process is employed in case of
A. Tin
B. Copper
C. Zinc
D. Aluminium
✅ The correct answer is option B.
Stellite is a __________ material.
A. Ferrous
B. Ceramic
C. Cemented carbide
D. Non ferrous cast alloy cutting tool
✅ The correct answer is option D.
With decrease in the grain size of a material, its creep resistance
A. Increases
B. Decreases
C. Remains constant
D. Either A or B ; depends on the material
✅ The correct answer is option C.