Shaft/rotor speed is most accurately measured by a:
A. Frequency counter
B. Tachometer
C. Strobometer
D. Speedometer
Factor of safety is the ratio of the ______ stress to the working stress:
A. Tensile
B. Compressive
C. Yield
D. Bearing
The escape velocity of a body on earth which is independent of its mass is about ______ km/second:
A. 3
B. 7
C. 11
D. 15
Magnetic permeability of iron is increased by its:
A. Decarburising
B. Alloying with cobalt
C. Purification
D. Alternate heating & cooling
The main reducing agent in iron blast furnace is:
A. Carbon dioxide
B. Carbon monoxide
C. Oxygen
D. Air
Broaching tools are usually made of:
A. Cermets
B. High speed steel
C. Tungsten carbide
D. Stellite
Temper brittleness of a material can be fairly detected by the _____ test:
A. Fatigue
B. Notched bar impact
C. Tensile
D. Hardness
There are one octahedral void and _____ tetrahedral void in the closest packing of atoms:
A. One
B. Two
C. Three
D. None of these
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
_____ remains constant during the adiabatic cooling of moist air:
A. Wet bulb temperature
B. Dry bulb temperature
C. Relative humidity
D. Specific humidity
