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Browse complete papersA center drill is used before drilling because it:
Reduces the spindle rotation of the lathe
Increases the temperature at the cutting zone
Removes burrs and debris from the drilled hole
Provides a pilot hole to guide the main drill
Correct answer
Reduces the spindle rotation of the lathe
What is the typical least count of a bevel protractor with a vernier scale?
10 minutes
0.1°
1°
5 minutes
Correct answer
10 minutes
Given are four concurrent forces: 10 N east, 20 N north, 15 N west, 25 N south. What is the direction of the resultant force?
North-east
North-west
South-east
South-west
Correct answer
North-east
A mechanical engineer needs to choose a steel for a structural component that requires moderate ductility and high weldability. Based on the chemical composition and classification, which steel type should be recommended?
Mild steel with increased silicon and phosphorus content
Alloy steel with high manganese and vanadium content
Alloy steel with high chromium and nickel content
Mild steel with low carbon and minimal alloying elements
Correct answer
Mild steel with increased silicon and phosphorus content
Which characteristic is assessed in the bend test for welded joints?
Chemical composition check
Magnetic properties check
Ductility of the weld metal
Surface finish of the weld
Correct answer
Chemical composition check
The center of pressure for a submerged horizontal plane surface is:
The point of total hydrostatic force, located below the centroid when the surface is inclined
The centroid of the plane surface, representing the geometric center of the submerged area
The top edge of the submerged surface, taken as the uppermost boundary of fluid contact
A position independent of the depth of immersion, unaffected by how far the surface is submerged
Correct answer
The point of total hydrostatic force, located below the centroid when the surface is inclined
Which property most significantly differentiates mild steel from alloy steel when exposed to high-temperature mechanical stress in industrial applications?
Mild steel has enhanced corrosion resistance at high temperatures compared to alloy steel
Mild steel provides improved wear resistance under high temperatures compared to alloy steel
Alloy steel maintains higher mechanical strength at elevated temperatures compared to mild steel
Alloy steel demonstrates greater ductility at elevated temperatures than mild steel
Correct answer
Mild steel has enhanced corrosion resistance at high temperatures compared to alloy steel
Which of the following is considered a common surface defect in welding processes?
Incomplete penetration at root
Lamellar tearing in plate
Excessive spatter deposits
Undercut along the weld bead
Correct answer
Incomplete penetration at root
Why does the vapor pressure of a liquid increase with an increase in temperature?
Density reduces in a straight-line manner
Molecules gain kinetic energy to escape into vapor
Surface tension remains constant
Viscosity reduces exponentially
Correct answer
Density reduces in a straight-line manner
Which of the following pair of processes in the Otto cycle are both isentropic?
Heat addition and heat rejection processes
Compression and heat rejection processes
Expansion and heat addition processes
Compression and expansion processes
Correct answer
Heat addition and heat rejection processes