Related Questions

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
A 20
B 40
C 65
D 80
Calcination of limestone is not done in a __________ kiln for producing lime.
A Vertical shaft
B Rotary
C Fluidised bed
D Fixed bed
Calcination of limestone to produce lime is done in a __________ kiln.
A Tunnel
B Rotary
C Vertical shaft
D Both B and C
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.
A Twice
B Four times
C Eight times
D Sixteen times
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
A Preheating
B Cooling
C Burning
D All of the above
__________ bricks are used in the burning zone of a cement rotary kiln.
A High alumina
B Fireclay
C Thoria
D Silicon carbide
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and $$I$$ = Mass moment of inertia of the disc attached at the end of a shaft)
A $$2\pi \sqrt {\frac{{\text{q}}}{I}} $$
B $$2\pi \sqrt {{\text{q}}I} $$
C $$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$
D $$\frac{1}{{2\pi }}$$
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$  = Coefficient of friction between the shaft and bearing)
A $${\text{r}}\sin \varphi $$
B $${\text{r}}\cos \varphi $$
C $${\text{r}}\tan \varphi $$
D $$\frac{{\text{r}}}{2}\cos \varphi $$
The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as
A Bending moment
B Twisting moment
C Torsional rigidity
D Flexural rigidity
Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are
A 5°C and 1 kgf/cm2
B -20°C and 1 kgf/cm2
C 0°C and 1 kgf/cm2
D 0°C and 3 kgf/cm2

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