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Browse complete papersWhich type of friction occurs when surfaces are lubricated with a fluid?
Rolling friction
Film friction
Static friction
Dry friction
Correct answer
Rolling friction
Why is a steady rest sometimes used in cylindrical grinding?
To cool the workpiece during grinding
To align the grinding wheel to the table
To support long workpieces during rotation
To hold abrasive materials for grinding
Correct answer
To cool the workpiece during grinding
Which defect is most likely to result from excessive carburizing time in steel heat treatment?
Development of coarse pearlite across the section
Initiation of intergranular corrosion in the core
Formation of excessive retained austenite at the surface
Increase in porosity throughout the component
Correct answer
Development of coarse pearlite across the section
Trackless cranes are mainly used for:
Continuous material transport
Lifting loads in confined or uneven areas
Operations limited to fixed tracks
Handling liquid materials only
Correct answer
Continuous material transport
Radial flow pumps are preferred when:
High flow, low head is required
Only low suction head is available
Low flow, high head is required
Flow is very viscous
Correct answer
High flow, low head is required
For a small spherical droplet of liquid with surface tension σ and diameter d, which of the following correctly expresses the pressure intensity inside the droplet p due to surface tension?
\( p = \frac{6\sigma}{d} \)
\(p = \frac{4\sigma}{d}\)
\(p = \frac{\sigma}{d}\)
\( p = \frac{2\sigma}{d} \)
Correct answer
\( p = \frac{6\sigma}{d} \)
An LVDT (Linear Variable Differential Transformer) is primarily used in which type of comparator?
Pneumatic comparator
Optical comparator
Mechanical comparator
Electrical comparator
Correct answer
Pneumatic comparator
For shafts designed to transmit the same torque, which statement is generally true when comparing a solid shaft to a hollow shaft of the same material and outer diameter?
Both shafts have equal torsional stiffness and equal weight.
The hollow shaft has a lower torsional stiffness but lower weight.
The solid shaft has a higher torsional stiffness and lower weight.
The hollow shaft has a higher torsional stiffness and higher weight.
Correct answer
Both shafts have equal torsional stiffness and equal weight.
In a workshop, why might a lever-operated hoist be preferred over an electric hoist for certain applications?
Portability and suitability for short, manual lifting operations
Continuous operation and automatic overload protection
Lower initial cost and larger load lifting capacity
High lifting speed and remote control capabilities
Correct answer
Portability and suitability for short, manual lifting operations
For a simply supported beam with multiple point loads, maximum bending moment occurs where:
Reaction = 0
Load = 0
Deflection = 0
Shear force = 0
Correct answer
Reaction = 0