HPCL Mechanical Engineer Mock Test - 5 Free Online Test 2026

Desolate: Empty And with out person, making you feel sad/frightened
absolute: Total and complete
Obsolete: Something no longer in use
Primitive: Belonging to an early stage in the development of humans and animals

• Meaning of Warrior: A brave or experienced soldier or fighter.
• Meaning of Sailor: a person who goes sailing as a sport or recreation
• Meaning of Pirate: a person who attacks and robs ships at sea
• Meaning of Spy: a person employed by a government or other organization to secretly obtain information on an enemy or competitor

Use structure “subject + auxiliary + past participle ”
As per the given above sentence is given in Passive Voice.
You have been warned.
Therefore , required answer will be option A .

Unconnected not joined together or to something else.
Chaotic : in a state of complete confusion and disorder.
Unaccountable : unable to be explained; Inexplicable.
Confusing : bewildering or perplexing.
Inexplicable : unable to be explained or accounted for.

Synonym of Inexplicable is Unaccountable

To lynch is to murder, or unlawfully kill. When an angry mob kills someone they believe is guilty of a crime, they lynch that person. Through history, when a group of people murders someone, especially by hanging him by the neck, they are usually said to lynch him.

( x=0.222)-eq1
(10x=2.22 after multiplying 10 to both side)-eq2
(9x=2after subtract eq2 from 1)
x= 2/9
we have find 9x so,
9×(2/9)
9×2/9
2

Let the S.P = 100
then C.P. = 25
Profit = 75
Profit% = 75/25 * 100 = 300 %

63 is divisible by 7 for any power, so required remainder will depend on the power of 4
Required remainder 

find remainder when 99/4 ( by 4 because to check periodicity)

Let the widh = 2x
Length = 3x
2x × 3x = 54
x = 3 cm
Hence, Option A is correct.

Hence, Option A is correct.

The number of students who play both the games = (30 + 50 + 40)% – 100% = 20%
Hence, Option D is correct.

Prime numbers between 1 and 30 →13, 17, 19, 23 and 29 (5)
Rest are prime numbers.
Total numbers 12 to 29 = 18
Total composite numbers = 13

Hence, Option A is correct.

Hence, Option D is correct.

Total females = 100% - 52% = 48%
So the answer = (100 – 60)% of 52% + (100 – 70)% of 48% = 35.20%
Hence, Option B is correct.

AB || CD and t transversal intersects them at E and F
∠BEF + ∠EFD = 180° (co-interior angles)

⇒ ∠FEG + ∠EFG = 90°
In Δ GEF
∠EGF + ∠FEG + ∠EFG = 180°
∴ ∠EGF + 90° = 180°
∴ ∠EGF = 90°.
The above result can be restated as :
If two parallel lines are cut by a traversal, then the bisectors of the interior angles on the same side of the traversal intersect each other at right angles.

So the answer = (100 – 50)% of 700 + (100 – 60)% of 500 = 550
Hence, Option D is correct.

We know that 
By applying that rule here, we get 
since 

Weights → A + B + C + D = 64 × 4 = 256 kg
Weights → A + B = 50 × 2 = 100 kg
Weights → B + C + D = 70 × 3 = 210 kg
Weights → A + B + B + C + D = 100 + 210 = 310 kg
So the answer = 310 – 256 = 54 kg
Hence, Option D is correct.

Paper will be folded from up to down then right to left.

Concept:

E = Young's Modulus of elasticity = Stress / strain

G = Shear Modulus or Modulus of rigidity = Shear stress / Shear strain

ν = Poisson’s ratio = - lateral strain / longitudinal strain

K = Bulk Modulus of elasticity = Volumetric stress / Volumetric strain

Relation between E, K and ν

E = 2G (1 + ν)

E = 3K (1 - 2ν)

Calculation:

E = 3K (1 - 2ν)

The pressure angle, representing the steepness of the cam profile, is the angle between the normal to the pitch curve at a point and the direction of the follower motion. It varies in magnitude at all instants of the follower motion. A high value of the maximum pressure angle is not desired as it might jam the follower in the bearings.

P_n = The component of force P, normal to section FG = P cos θ

P_t = The component of force P, along the surface of the section FG (tangential to the surface FG) = P sin θ

σ_n = Normal Stress across the section FG

σ_n=σcos²θ

σ_t = Tangential/Shear Stress across the section FG

In a free vortex flow, total mechanical energy remains constant. There is neither any energy interaction between an outside source and the flow nor is there any dissipation of mechanical energy within the flow. The fluid rotates by virtue of some rotation previously imparted to it or because of some internal action.

Some examples are a whirlpool in a river, the rotatory flow that often arises in a shallow vessel when liquid flows out through a hole in the bottom (when water flows out from a bathtub or a washbasin), and flow in a centrifugal pump case just outside the impeller.

Crystal structure of Material

FCC: - Ni, Cu, Ag, Pt, Au, Pb, Al, Austenite or Ƴ-iron

BCC: - V, Mo, Ta, W, Ferrite or α-iron, δ-ferrite or δ-iron

HCP: - Mg, Zn

Cobalt: - HCP < 420°c,="" fcc=""> 420°C

Chromium: - HCP < 20°c,="" bcc=""> 20°C

Glass: - Amorphous

An orifice meter provides a simpler and cheaper arrangement for the measurement of flow through a pipe. An orifice meter is essentially a thin circular plate with a sharp-edged concentric circular hole in it.

C_d is defined as the ratio of the actual flow and the ideal flow and is always less than one.

For the orifice meter, the coefficient of discharge C_d depends on the shape of the nozzle, the ratio of pipe to nozzle diameter, and the Reynolds number of the flow.

Actually, there is a distinct difference between heat and temperature.

Temperature is a measure of the amount of energy possessed by the molecules of a substance. It manifests itself as a degree of hotness and can be used to predict the direction of heat transfer. The usual symbol for temperature is T. The scales for measuring temperature in SI units are the Celsius and Kelvin temperature scales.

Heat, on the other hand, is energy in transit. Spontaneously, heat flows from a hotter body (higher temperature) to a colder one (lower temperature). The usual symbol for heat is Q. In the SI system, common units for measuring heat are the Joule and calorie.

Confusion point:

There are different types of energy. Heat is a transfer of thermal energy.

The driving force for heat transfer is the temperature difference.

- Within the piezometer tube, the locus of elevations to which the water would rise if open to the atmospheric pressure represent the Hydraulic grade line (HGL).

- The difference in elevation of the water surface in the successive conduit represents the friction and other minor losses in the conduits.

- If the conduit has a slope equal to the friction slope, then the HGL would be parallel to the conduit, ignoring minor losses.

- Energy grade line (EGL) = HGL + v2/2g

- The EGL will be represented by a series of pitot tubes (small tubes with their end openings pointed upstream) intercepting the kinetic energy of the flow.