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.Management Sciences
Category: Chemical Engineering Basics
Hot working of lead is carried out at ___________________?
A. 75°C
B. 373°K
C. 150°C
D. Room temperature
Addition of ____________________ to steel does not help in improving its machinability?
A. Sulphur
B. Silicon
C. Lead
D. Phosphorous
Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when_________________?
A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters
In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________?
A. Higher, as it gives higher wavelength
B. Lower, as it gives higher wavelength
C. Higher, as it gives shorter wavelength
D. Lower, as it gives shorter wavelength
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the ______________ of a boiler ?
A. Evaporative capacity
B. Evaporation efficiency
C. Thermal efficiency
D. Steam load
Pick out the wrong statement ?
A. Lead can creep under its own weight at room temperature
B. The electrical conductivity of gold is considerably reduced by alloying additions due to the
decrease in electron movement
C. Recrystallisation temperature decreases with decrease in strain in a cold worked metal
D. With increase in temperature, the electrical conductivity of intrinsic semi-conductor will
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?
A. 2300 J
B. 4600 J
C. 230 J
D. 2.3 × 106 J
An abrupt and sudden fall in the reading of barometer is an indication of the____________________?
A. Storm
B. Rain
C. Clear weather
D. Cold wave
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