Answer: Firebrick is referred to as "common brick" because it is the most commonly used type of brick --- False
Explanation:
Firebrick is not the most commonly used, it is a refractory ceramic brick used in lining of furnaces and kilns, which is built basically to withstand or resist high temperature.The most commonly used type of brick, is the Building Brick called "common brick" because it is versatile and used for applications where appearance is not an important factor.
Answer:
(a)T₀= T∞ + Rfin/ Rins +Rfin (Tw -T∞) (b) T = log. 16º C. therefore the length rod cannot meet specified limit, so we can use stainless steel to alter thermal conductivity.
Explanation:
Solution
Recall that:
A diameter of rod D = 25m with a Thermal conductivity of 60 W/m·K
Protrudes from a furnace with a temperature wall of 200ºC
The rod is welded to the furnace wall and is used as a hangar for instrumentation cable.
The surface of he temperature of last 100m is kept below 100ºC
So,
The ambient temperature is = 25ºC
Convection coefficient = 15 W/m2K.A.
Diameter = 25mm
K = 60 W/m·K
Tw = 200 ºC.
L ins = 200mm
Now,
Tmax = 100ºC
T∞ = 25C
h = 15w/m²k
Note: Kindly find an attached copy of part of the solution to this given example
Answer:
The entropy change of the air is
Explanation:
is unknown
we can apply the following expression to find
now substitute
To find entropy change of the air we can apply the ideal gas relationship
Δ
Δ
Δ
Answer:
negative
Explanation:
The convergence (toe in) or parallelism of the front wheels is the position that the wheels occupy with respect to the longitudinal axis of the vehicle.
It is said that the direction is convergent when the wheels are closer to each other by the front than by the rear and divergent when the opposite occurs.
In vehicles with rear-wheel drive, the rolling resistance of the front wheels creates a torque that tends to open both wheels, to compensate for this effect, it is counteracted with a positive convergence angle.
In the case of vehicles with front-wheel drive, the problem is different, the tensile stress of the wheels produces a torque that acts in the opposite direction than in the previous case, that is, tending to close the wheels instead of opening them, therefore for to compensate for this tendency it will be necessary to give the wheels a negative convergence angle (divergence).
Excessive convergence with what the manufacturer gives us, causes lateral wear in the outer area of the tires. Insufficient convergence causes lateral wear inside the tires.
Answer:
The Transition Metal Properties
Low ionization energies.
Positive oxidation states.
Multiple oxidation states, since there is a low energy gap between them.
Very hard.
Exhibit metallic luster.
High melting points.
High boiling points.
High electrical conductivity.