A. promotes decarburisation
B. provides high hot hardness
C. forms very hard carbides and thus in-creases wear resistance
D. promotes retention of austenite
E. increases toughness
Related Mcqs:
- ‘Killed steels’ are those steels__________________?
A. which are destroyed by burning
B. which after their destruction are recycled to produce fresh steel
C. which are deoxidised in the ladle with silicon and aluminium
D. in which carbon is completely burnt
E. which have poor properties due to improper manufacturing - An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about___________________?
A. 2%
B. 4%
C. 8%
D. ±4%
E. 1%. - Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?
Isothermal compression efficiency, even when running at high speed, can be approached by using
A. multi-stage compression
B. cold water spray
C. both A. and B. above
D. fully insulating the cylinder
E. high stroke - Tungsten in high speed steel provides________________?
A. hot hardness
B. toughness
C. wear resistance
D. sharp cutting edge
E. cold hardness - For same power and same speed, the flywheel of a four stroke engine as compared to two-stroke I.C. engine will be________________?
A. smaller
B. bigger
C. same size
D. dependent on other engine parameters
E. unpredictable - In isochronous governing, speed droop is_______________?
A. 100%
B. 50%
C. 5%
C. 30%
E. 1%. - With increase in engine speed, the ignition of spark in petrol engine has to be __________________?
A. Unaltered
B. Increased
C. Decreased
D. Advanced - Which of the following instrument can be used for measuring speed of an aeroplane___________________?
A. Venturimeter
B. Orifice plate
C. hot wire anemometer
D. rotameter
E. pitot tube - Which of the following instrument can be used for measuring speed of a submarine moving in deep sea__________________?
A. Venturimeter
B. Orifice plate
C. hot wire anemometer
D. rotameter
E. pitot tube - The speed of sound in a ideal gas varies directly as its__________________?
A. pressure
B. temperature
C. density
D. modulus of elasticity
E. absolute temperature
