431. Which of the following is a synthetic abrasive ?
A. Corundum
B. Emery
C. Pumice
D. Silicon carbide
✅ The correct answer is option D.
Engineering
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432. Which of the following has rotten eggy smell?
A. Hydrogen sulphide
B. Styrene
C. Phenol
D. Dimethyl amine
✅ The correct answer is option A.
433. __________ method of depreciation calculation ensures that the interest is charged on the cost of machine asset every year on the book value, but the rate of depreciation remains constant every year.
A. Annuity charging
B. Atraight line
C. Ainking fund
D. None of these
✅ The correct answer is option B.
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.
435. __________ stress can not be sustained by a fluid in equilibrium.
A. Shear
B. Tensile
C. Compressive
D. None of these
✅ The correct answer is option A.
436. Temper brittleness of a material can be fairly detected by the __________ test.
A. Fatigue
B. Notched bar impact
C. Tensile
D. Hardness
✅ The correct answer is option B.
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.
438. Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is
A. 38
B. 26
C. 16
D. 4
✅ The correct answer is option D.
439. Electric arc furnace is employed mainly for the production of __________ steel.
A. High carbon
B. Alloy
C. Mild
D. Plain carbon
✅ 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.