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
Silicon percentage in silicon steel used for electrical equipments is about:
A. 1
B. 4.0
C. 8
D. 14
Babbitt lining is used on brass/bronze bearings to increase the:
A. Antifriction properties
B. Compressive strength
C. Bearing resistance
D. Wear resistance
Window panes of aeroplanes are normally made of:
A. Perspex (PMMA)
B. Teflon (PTFE)
C. Bakelite (phenol formaldehyde)
D. Polystyrene
Which of the following hardness tests does not measure the indentation hardness of metals and alloys:
A. Vickers hardness test
B. Shore scleroscope test
C. Brinell hardness test
D. Rockwell hardness test
Which of the following approaches the ideal gas behaviour most closely:
A. Wet steam
B. Saturated steam
C. Superheated steam
D. Saturated water
Normalising does not _______ of a metal:
A. Improve machinability & tensile strength
B. Remove internal stresses
C. Refine the structure
D. Remove strains caused by cold working
Gratings is associated with the measurement of:
A. Linear displacement
B. Concavity/convexity
C. Surface texture
D. Flatness
Water flow in the river during flood can be categorized as the ______ flow:
A. Unsteady uniform
B. Unsteady non-uniform
C. Steady uniform
D. Steady non-uniform
The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the:
A. Ability to absorb shock
B. Capacity to store energy
C. Ratio of the wire & coil diameters
D. Load to produce unit deflection
