991. Age hardening is connected with
A. Babbit metal
B. Gun metal
C. Stainless steel
D. Duralumin
✅ The correct answer is option D.
Engineering
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992. With increase in temperature, the electrical conductivity of semiconductors
A. Increases
B. Decreases
C. Remain constant
D. Either A or B, depends on the type of semi-conductor
✅ The correct answer is option A.
993. A hot short metal is
A. Hard when hot
B. Brittle when cold
C. Brittle when hot
D. Brittle under all conditions
✅ The correct answer is option C.
994. Which of the following welding processes employs the highest welding temperature ?
A. Arc welding
B. Gas welding
C. Thermit welding
D. Resistance welding
✅ The correct answer is option D.
995. Which of the following metals is the most prone to work hardening?
A. Brass
B. Aluminium
C. Copper
D. Lead
✅ The correct answer is option A.
996. The main function of the deaerator used in the thermal power plant is to
A. Throttle down the steam pressure
B. Enhance feed water temperature
C. Remove dissolved gases from feed-water
D. Remove non-condensable gases from condenser
✅ The correct answer is option C.
997. Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel.
A. 0.01 to 0.10
B. 0.2 to 0.4
C. 0.5 to 0.7
D. 0.8 to 1.0
✅ The correct answer is option B.
998. Safety matches is produced using
A. Red phosphorus
B. Yellow phosphorus
C. Black phosphorus
D. Elemental sulphur
✅ The correct answer is option A.
999. A dense structure of grinding wheel is not used for the
A. Ductile material
B. Hard materials
C. Brittle materials
D. Finishing cuts
✅ The correct answer is option A.
1000. In radiative heat transfer, a grey surface is the one, which has
A. Emissivity independent of wavelength
B. Grey appearance to the eye
C. Zero reflectivity
D. Equal brightness in all directions
✅ The correct answer is option A.