Free Bachelor of Engineering Science Questions and Answers — Questions and Answers

Question 1: Which statement about the universe is accurate?

It is an international system
It is an isolated system (Correct answer)
It is a closed system
It is an open system

Correct answer: It is an isolated system

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.

Question 2: What is the family of circles with a single diameter differential equation's order along the y=x axis?

Lenz’s law
Electromagnetic law (Correct answer)
The Doppler Effect
Newton’s law of gravitation

Correct answer: Electromagnetic law

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.

Question 3: Which of the following results in the law of energy conservation?

Isotropy
Gravity
Homogeneity of time (Correct answer)
Nuclear force

Correct answer: Homogeneity of time

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.

Question 4: Which of the following results in the angular momentum conservation law?

Gravity
Nuclear force
Isotropy of space (Correct answer)
Homogeneity of time

Correct answer: Isotropy of space

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.

Question 5: Which of the following describes the luminous intensity in SI units?

Candela (Correct answer)
Mole
Radian
Sterdian

Correct answer: Candela

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.

Question 6: Which one of the following has sterdian as its SI unit?

Solid angle (Correct answer)
Mass
Phase angle
Luminous intensity

Correct answer: Solid angle

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.

Question 7: Convert a 2 km/h² acceleration to cm/s².

0.055 cm/s²
0.0154 cm/s² (Correct answer)
0.0027 cm/s²
2×10⁵ cm/s²

Correct answer: 0.0154 cm/s²

2 km/h², or 0.0154 cm/s², is equal to a.

Question 8: 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?

150m
50m
1250m (Correct answer)
125m

Correct answer: 1250m

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.

Question 9: The fuel's HCV and NCV were determined to be 9210 cal/g and x% hydrogen, respectively. Discover y/x.

676.9
777
768
747.7 (Correct answer)

Correct answer: 747.7

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.

Question 10: Why is high pressure oxygen required by the bomb calorimeter?

To increase the kinetic energy
To increase the ignition temperature
To increase the rate of reaction
To ensure that the given sample in the crucible burns completely (Correct answer)

Correct answer: To ensure that the given sample in the crucible burns completely

This entire procedure should be performed at a pressure of 30 bar. The oxygen aids in the coal sample's burning.

Question 11: Exactly what kind of fuel is lignite?

Gaseous fuel
Liquid fuel
Primary fuel (Correct answer)
Secondary fuel

Correct answer: Primary fuel

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.

Question 12: Synthesis gas and acetylene are two examples of .

Liquid fuels
Gaseous fuels
Primary gaseous fuels
Secondary gaseous fuels (Correct answer)

Correct answer: Secondary gaseous fuels

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.

Question 13: Which of the subsequent claims is true?

1k.Cal=4C.H.U
1k.Cal=4C.H.U
1k.Cal=100Cal
1B.Th.U=252Cal (Correct answer)

Correct answer: 1B.Th.U=252Cal

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.

Question 14: The combustion products are cooled to _________ in order to determine the fuel's HCV.

200F
400F
600F (Correct answer)
700F

Correct answer: 600F

The combustion byproducts are cooled to room temperature, which is 600F or 150C. Steam is produced by turning hydrogen gas into steam.

Question 15: The highest temperature attained when coal burns totally in air is referred to as .

net calorific value
calorific value of coal
gross calorific value
calorific intensity of coal (Correct answer)

Correct answer: calorific intensity of coal

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.

Question 16: 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%.

7830.75cal/g (Correct answer)
7621.5cal/g
7780.5cal/g
7251.8cal/g

Correct answer: 7830.75cal/g

The net calorific value (NCV) of a fuel is calculated using Dulong's formula, which considers the heat produced by the combustion of carbon, hydrogen, and sulfur, while accounting for the oxygen already present. The NCV is derived from the gross calorific value (GCV) by subtracting the latent heat of vaporization of water formed from the hydrogen in the fuel. Performing the calculation (GCV = 8080C + 34500(H - O/8) + 2240S, then NCV = GCV - 9H * 587) yields 7830.75 cal/g.

Free Bachelor of Engineering Science Questions and Answers

Which statement about the universe is accurate?