FREE Bachelor of Engineering Science Questions and Answers
Which of the following describes the luminous intensity in SI units?
The SI unit for light intensity is the candela. One candela is the amount of light emitted in a particular direction by a source with a radiant intensity of 1/683 watt per sterdian and a monochromatic emission frequency of 540x1012 hertz.
Determine the coal sample's net calorific value using the following formula: C=80%, H=5%, O=4%, N=3%, S=3.5%, and ash=5%.
Apply the dulong's formula, which reads as follows: HCV = 1/100[8080C + 34500(H-O/8) + 22400S], where C, S, O, and H represent the relative proportions of carbon, sulphur, oxygen, and hydrogen. Apply the formula NCV=(GCV-0.09H*587), where 587cal/g is the latent heat of steam, and you will get NCV=7830.75cal/g by substituting all the specified numbers in the formula to produce HCV (or) GCV as 8094.9cal/g.
The fuel's HCV and NCV were determined to be 9210 cal/g and x% hydrogen, respectively. Discover y/x.
Apply the dulong's formula, which reads as follows: HCV = 1/100[8080C + 34500(H-O/8) + 22400S], where C, S, O, and H represent the relative proportions of carbon, sulphur, oxygen, and hydrogen. Therefore, enter all the specified values into the formula and calculate to obtain HCV. Given that H is unknown, you will receive HCV=[5336.75+345H]Cal/g. Then we know that NCV = (GCV-0.09H*587), where 587cal/g is the latent heat of steam. Let it be eauatin-1. In the event that NCV is known, you will obtain GCV=[9210+52.83H]Cal/g and should use equation 2. In order to find the value of H, combine the two equations. You will obtain H=13.25%; set it as x and enter it as a substitution in equation 1 to obtain HCV=9908cal/g. Let y be and divide y by x to obtain 747.7.
Why is high pressure oxygen required by the bomb calorimeter?
This entire procedure should be performed at a pressure of 30 bar. The oxygen aids in the coal sample's burning.
The combustion products are cooled to _________ in order to determine the fuel's HCV.
The combustion byproducts are cooled to room temperature, which is 600F or 150C. Steam is produced by turning hydrogen gas into steam.
Which one of the following has sterdian as its SI unit?
The term "sterdian" refers to the solid angle that is subtended in the center of a sphere by a surface of the sphere with an area equal to a square and sides that are each equal to the radius of the sphere.
Two parallel trains A and B, each 400 meters long, are going in the same direction at a constant speed of 72 kilometers per hour, with A in front of B. The driver of B makes the decision to pass A and speeds up by 1 m/s. What was the original distance between the two if, after 50 seconds, the guard of B simply brushes past the driver of A?
Let x represent the separation between train A's driver and train B's guard. Both trains are initially going at the same direction and speed of 72 km/h. B's relative velocity to A is therefore equal to vB-vA = 0. Since a=1m/s, t=50s, u=0, and s=ut + 1/2at2 = 1250m, the train B must travel that distance.
Which of the subsequent claims is true?
This value, 1B.Th.U=252Cal, is accurate. 1k.Cal=2B. Since 1k.Cal=3.968B, Th.U is incorrect. Th U = 2.2 C H U. Thus, 1k.Cal=4C.H.U is likewise incorrect. 1000 is a kilo. So, 1000 Cal = 1 000 Cal.
The highest temperature attained when coal burns totally in air is referred to as .
Calorific value of coal is the quantity of heat released during complete combustion of fuel. Gross calorific value, often known as HCV, is the total amount of heat released when fuel and byproducts are burned. The total amount of heat released following fuel combustion and product emissions is known as the net calorific value. The calorific intensity of coal determines the highest temperature that can be reached.
Which statement about the universe is accurate?
The overall energy of the universe is constant despite all the violent phenomena that constantly occur in it. Only in an isolated system does the total amount of energy remain constant. So the universe serves as an illustration of an isolated system.
Exactly what kind of fuel is lignite?
Since it can be taken from nature without going through any sort of modification procedure, lignite is a primary fuel. Brown, soft lignite coal. It is regarded as coal's lowest rank.
Which of the following results in the law of energy conservation?
If we conduct an experiment today at a specific location and repeat it one year later at the same location, we get the same outcomes. The law of conservation of energy is a result of this symmetry in nature with regard to the translation or displacement of time, which is known as homogeneity of time.
Which of the following results in the angular momentum conservation law?
Everywhere throughout the cosmos, the law of nature assumes the same shape. That is, there isn't a specific place in the cosmos. The law of conservation of linear momentum is derived from this homogeneity of space, a symmetry of the natural laws with regard to translation in space.
What is the family of circles with a single diameter differential equation's order along the y=x axis?
According to this theory, every body in the universe is drawn to every other body with a force that is inversely proportional to the square of the distance between them and directly proportional to the product of their masses. It therefore applies to all natural processes.
Synthesis gas and acetylene are two examples of .
They are secondary gaseous fuels since synthesis gas and acetylene both result from certain processes and are naturally gaseous. Calcium carbide can be hydrolyzed to produce acetylene.
Convert a 2 km/h² acceleration to cm/s².
2 km/h², or 0.0154 cm/s², is equal to a.