A. 30°
B. 60°
C. 90°
D. 120°
✅ The correct answer is option C.
Engineering MCQs
Between 230 and 370°C, blue brittleness is caused in mild steel because of the
A. Immobility of dislocation
B. Strain-ageing
C. Increase in Young’s modulus
D. Strain hardening
✅ The correct answer is option B.
A high pressure boiler generates steam at a pressure greater than __________ kg/cm² .
A. 10
B. 30
C. 50
D. 80
✅ The correct answer is option D.
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
A. Packed
B. Bubble
C. Spray
D. Tray
✅ The correct answer is option C.
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
A. Copper
B. Steel
C. Aluminium
D. Brass
✅ The correct answer is option A.
Three elastic constants for a completely anisotropic elastic material which follows the Hooke’s law are young’s modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?
A. Tensile strength
B. Elastic limit
C. Proportional limit
D. Yield strength
✅ The correct answer is option C.
Streaklines, streamlines & pathlines are almost identical for __________ fluid flow.
A. Ideal
B. Uniform
C. Steady
D. None of these
✅ The correct answer is option C.
On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is
A. Creep
B. Toughness
C. Tensile strength
D. Fatigue
✅ The correct answer is option B.
The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the __________ in the solution.
A. Power of hydrogen ion concentration
B. Percentage of hydrogen ions
C. Presence of hydrogen ions
D. None of these
✅ The correct answer is option A.
__________ is not used as a material of construction in thermocouples.
A. Alumel
B. Rhodium
C. Constantan
D. Duralumin
✅ The correct answer is option D.