HPCL Mechanical Engineer Mock Test - 2 - Mechanical Engineering MCQ

According to the given context we are talking about the critics who always criticize people but they have not done the job themselves in life.

Back to square one: Returning to the place from where one started 

Close but no cigar: Being close to accomplishing a goal but only falling short at the end 

Crying wolf: Intentionally raising a false alarm 

Back seat drivers: People who criticize from the sidelines 

From all the given options, we can see that only option D fits in the given context since it expresses the correct meaning of the given statement.

This makes option D the correct choice among the given options.

• Sterile means barren-unable to produce any child or offspring; unproductive that means barren.
  Another meaning of it is not imaginative or creative.
• Barren means (used about land or soil) not good enough for plants to grow on
• Arid means (used about land or climate) very dry; with little or no rain
• Fertile means (used about land or soil) that plants grow well in
• Dry means without liquid in it or on it; not wet

Hence Correct Answer is Option A

Correct Answer:
a) √5 and √6
We are asked to find two irrational numbers between 2 and 2.5.

Let’s check the values:

• √2 = 1.414 (irrational but not between 2 and 2.5)

• √4 = 2 (not between 2 and 2.5, and also rational)

• √5 ≈ 2.236 (irrational and between 2 and 2.5 )

• √6 ≈ 2.449 (irrational and between 2 and 2.5 )

• √9 = 3 (greater than 2.5 )

So, √5 and √6 are both irrational and lie between 2 and 2.5, hence option (a) is correct.

For number less than 1, if there are n zeroes after the decimal point, then the characteristics of that number will be −(n+1).

and For number  greater than 1, if  there are n number of zeroes are on the left sides of the digits then characteristics will be (n+1).

Hence, C is the correct option.

The decimal expansion 0.080080008000080000080000008….. is a. Non-terminating, non-recurring. Non-terminating, recurring.

Using Rule 1 :
1st number × 2nd number = L.C. M. × H.C.F,
First number × Second number = HCF × LCM

d = -4, n = 7, a(n) = 4
a(n) = a + (n – 1) x d
a + (7 – 1) x (-4) = 4
a + 6 x (-4) = 4
a – 24 = 4
a = 4 + 24
a = 28

2D definition - A two-dimensional (2D) object is an object that only has two dimensions, such as a length and a width, and no thickness or height. 
3D definition- A three-dimensional (3D) object is an object with three dimensions: a length, a width, and a height. The flat sides of three-dimensional objects are two-dimensional shapes.
Cuboid has length and width as well as thickness or height.

A cone is a three-dimensional figure which has a circular base and a curved surface.

A Sphere is three dimensional figure because it has volume.

Circle is the 2D figure because it does not have thickness

So the correct option will be D

From the final arrangement, we get D is second to the left of E.
Hence, Option B is correct.
References:
O sits 3^rd to the right of N.
One who sits just behind O is to the immediate right of E.
Inferences:
From the above reference, we get the following cases:

References:
B is neither at any of the extreme ends nor sits exactly behind O.
The number of people sitting between C and E, is the same as the number of people sitting between E and B.
Inferences:
From the above reference, we get the following cases:

References:
D doesn’t sit at any of the extreme ends.
P sits on a seat which is exactly ahead of A.
M is not exactly ahead of E.
Inferences:
From the above reference, we get the following cases:
Case 1: Position of D cannot be fixed, thus this case is eliminated.

Case 2: We get the final arrangement as below:

Decoding the information, 

Given:

14 ÷ 2 + 8 × 5

After replacing the signs from left to right and using the BODMAS rule,

14 + 2 × 8 - 5

= 14 + 16 - 5

= 30 - 5

= 25

Hence, “25” is the correct answer.

The logic followed here is:

The place value of A is 1, D is 4, O is 15 and U is 21. 

In each of the given figure the alphabet and its place value are given except  U and 23 in figure D.

Hence, figure D is the odd one from the given figures.

P, Q, R, S, T, V, W, and Z are sitting around a circle facing at the centre not necessarily in this same order.

i) T is second to the right of R who is third to the right of P.

Mistake Points

Who is used for the second person in a connecting statement.

For example: 

T is second to the right of R who is third to the right of P.

Here, who is used for R and not for T.

ii) S is second to the left of P and fourth to the right of Q.

iii) V who is not an immediate neighbour of P. (This means V cannot sit immediate left or right of P).

iv) Z is third to the right of V 

Thus we can see S is immediate left of Z.

Hence, the correct answer is "Option 3".

Hence, option C is correct.

Preparing the family tree using the following symbol:

According to the given information,

Hence, Q is the grandmother of S.

Answer : The word that is different from the rest is: B: Swan
Reasons:
- Size: Swans are significantly larger than sparrows, parrots, and koels.
- Habitat: While the other birds (sparrow, parrot, and koel) are primarily found in various terrestrial environments, swans are mainly found in aquatic habitats such as lakes, ponds, and rivers.
- Behavior: Swans are known for their elegance and unique mating rituals (such as the famous "swan dance"), which are not seen in the other mentioned birds.
- Body Structure: Swans have long, curved necks, and their bodies are streamlined for swimming, whereas the other birds have shorter necks and are primarily adapted for perching or flying.Swan is the only water bird in the group.

Thus, the code for REMAIN is 8@7$%6.
Hence, option D is correct.

Quality parameters. Quality attributes of fruits and vegetables such as appearance, colour, aroma, taste drive the decision of consumers to buy a product. In the past, high-quality standards were mainly imposed by retailers (e.g., long shelf-life, color, texture, shape) and less on the consumers' side.

A spark plug gap is kept from- 0.3-0.7 mm because 0.3-0.7 is perfect gap for making spark in spark plug.

An internal combustion engine (ICE) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit.

Reaction Turbine: If at the inlet of the turbine, the water possesses kinetic energy and pressure energy, the turbine is known as a reaction turbine. e.g., e Francis and Kaplan turbine.

Tangential flow turbines: In this type of turbine, the water strikes the runner in the tangent direction to the wheel. Example: Pelton wheel turbine

Radial flow turbines: In this type of turbine, the water strikes in the radial direction. accordingly, it is further classified as

• Inward flow turbine: The flow is inward from periphery to the centre (centripetal type); Example: old Francis turbine

• Outward flow turbine: The flow is outward from the centre to periphery (centrifugal type); Example: Fourneyron turbine

Axial flow turbine: The flow of water is in the direction parallel to the shaft axis. Example: Kaplan turbine and propeller turbine

∴ Francis turbine is a radial inward flowing reaction turbine.

Efficiency of heat engine (ɳ) = (T_H – T_L) / _TH = W_out/ Q_in

T_H = Temperature of the hot reservoir

T_L = Temperature of the cold reservoir

Q_in = Heat input to the engine

W_out = Work output from the engine

Calculation:

TH = 2127°C = 2127 + 273 = 2400 K

T_L = 27°C = 27 + 273 = 300 K

Efficiency will be maximum when the engine is reversible.

To match the process indices with the T-s traces, we need to understand what each process index 'n' corresponds to in thermodynamic processes:

• A process with n = 1 represents an isothermal process, where temperature remains constant. On a T-s diagram, this would be a horizontal line.
• An index n = γ (gamma) typically represents an adiabatic process for an ideal gas, where γ is the ratio of specific heats (Cp/Cv). This is also an isentropic process since it is adiabatic and reversible, represented by a vertical line on the T-s diagram.
• An index n = 1.4 could be specifically indicative of the adiabatic process for a diatomic gas (like air), where γ is approximately 1.4.
• An index n = 1.0 might be a special case representing an isobaric process where pressure remains constant. On a T-s diagram, this would not be a horizontal line, as that represents isothermal. It would actually be a line with a positive slope since entropy increases with temperature at constant pressure.

Based on the T-s diagram provided:

• Trace 1 could be isothermal (A), where temperature remains constant as entropy increases.
• Trace 2 shows an increasing temperature with increasing entropy, which could indicate an isobaric process (B).
• Trace 3 is a vertical line, which would represent an adiabatic/isentropic process where entropy remains constant (D).
• Trace 4, which is not vertical but has a steep slope, could correspond to an adiabatic process with a specific γ (C), although in an actual T-s diagram, an adiabatic process for an ideal gas might appear as a curved line due to the relationship between entropy and temperature.

So, the matching would most likely be:
A - 3 (Isothermal process, trace 1)
B - 1 (Isobaric process, trace 2)
C - 2 (Adiabatic process with γ = 1.4, trace 4)
D - 4 (Adiabatic/isentropic process, trace 3)
From the options given:
(A) A-3, B-1, C-4, D-2
(B) A-2, B-1, C-4, D-3
(C) A-3, B-4, C-1, D-2
(D) A-2, B-4, C-1, D-3
The correct match would be option (A).

The mass of an object can be calculated in a number of different ways: mass=density×volume (m=ρV). Density is a measure of mass per unit of volume, so the mass of an object can be determined by multiplying density by volume. mass=force÷acceleration (m=F/a).