______________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently ?
(A) Collar
(B) Flanged
(C) Bell and Spigot
(D) Expansion
The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be_____________________?
(A) 0.8
(B) 1
(C) 1.4
(D) 1.8
__________________ of air does not increase with increase in temperature?
(A) Density
(B) Thermal diffusivity
(C) Viscosity
(D) Thermal conductivity
‘Cryogenics’ is concerned with the generation & use of low temperature in the range of____________________?
(A) 0°K to 123°K
(B) 0°C to – 123°C
(C) 0°C to – 273°C
(D) 0°K to 273°K
The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _____________________?
(A) Base and strong acid
(B) Base and weak acid
(C) Acid and weak base
(D) None of these
Carbon is present in the form of _______________________ in grey cast iron ?
(A) Spheroids
(B) Nodular aggregates of graphite
(C) Flakes
(D) Cementite
Spherical shape of mercury droplets is due to its____________________?
(A) High viscosity
(B) Low surface tension
(C) High density
(D) High surface tension
Uniform ramming of sand in green sand moulding process leads to____________________?
(A) Reduced chance of gas porosity
(B) Greater dimensional stability of the casting
(C) Uniform flow of molten metal into the mould cavity
(D) Less sand expansion type of casting defect
____________________ flux is used for the extraction of metal from its self fluxing ores?
(A) No
(B) Acid
(C) Basic
(D) Neutral
Percentage of differential pressure lost in a Venturimeter with a tapering of 15° may be about___________________?
(A) 1
(B) 10
(C) 25
(D) 50