Technical exam compitition

Stablity of floating Bodies

ISRO_2018 mechanical question

QNO. 1 THE IMPACT STRENGTH OF A MATERIAL IS A INDEX OF?
A. STRENGTH
B. TOUGHNESS
C. HARDNESS
D. FATIGUE

Why two stroke engine more efficient in railway locomotives

The velocity corresponding to Reynold number of 2800, is called
A. sub-sonic velocity
B. super-sonic velocity
C. lower critical velocity
D. higher critical velocity

The kinematic viscosity is the
A. ratio of absolute viscosity to the density of the liquid
B. ratio of density of the liquid to the absolute viscosity
C. product of absolute viscosity and density of the liquid
D. product of absolute viscosity and mass of the liquid

Happy 70 Independence day to all of you dear.....God bless you all

Shock resisting steels should have

A. low wear resistance
B. low hardness
C. low tensile strength
D. toughnes

All the best for all competitors who were preparing for F.C.I exam. Exam is on 4 oct.

Which of the following material has maximum ductility?

A. Mild steel
B. Copper
C. Nickel
D. Aluminium

Detonation is harmful due to

A. increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
B. excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
C. high intensity of knock causes crankshaft vibration and the engine runs rough
D. none of the above

The higher combustion chamber wall temperature in compression ignition engines will __________ knocking tendency.

A. increase
B. reduce
C. not effect