HPCL Mechanical Engineer Mock Test - 6 - Mechanical Engineering MCQ

One word substitution is Stickler.

Disciplinarian: A person who believes in or practises firm discipline.

Stickler: A person who insists on a certain quality or type of behaviour.

Instantaneous: Occurring or done instantly.

Boaster: A very boastful and talkative person.

Let the number be x. Then,

The given series : 5, 8, 11, 14, …
a = 5
d = 8 – 5 = 3
a(n) = a + (n – 1) x d
10th term = a(10) = a + (10 – 1) x d
= 5 + 9 x (3)
= 5 + 27
= 32

One side by car = 5 – 4 = 1 hour
So the answer = 1 × 2 = 2 hours
Hence, Option B is correct.

Lets break the figure -
It has 6 surfaces.
Area of bottom surface = L * B
Area of Top Surface = L * B
Area of Right side surface = B * H
Area of Left Side surface  = B * H
Area of front Surface = H * L
Area of Back surface = H * L 
Total surface area of Cuboid = sum of all the surfaces.
=> (Bottom surface area + Top surface area + Right side surface area + Left side surface area + front side surface area
back side surface area)
=> (LB + LB + BH + BH + HL + HL)
=> (2LB + 2BH + 2HL)
=> 2(LB + BH + HL)
hence option B is correct.

AP: 21, 42, 63, 84, …
a = 21
d = 42 – 21 = 21
a(n) = 210
a + (n – 1) x d = 210
21 + (n – 1) x (21) = 210
21 + 21 x n – 21 = 210
21 x n = 210
n = 10

Alcohol = 40% of 120 = 48

Hence, Option C is correct.

Triangle, square and rhombus are shapes. Tangent is not.

All are the parts of tree.

T is the daughter of R.

In the figure the simplest Triangles are GLK, DLJ, DJM,HMN,QRE,IRA,IPA, and FPO is the 8 triangle

and another is BDO,CDQ,DLM, PRA, KFI, NEI, HJI, GJI,DKI, and DNI is the 10 triangle

and another is DIE, DFI, DOA, DQA, and GHI is the 5 triangle

and DCA, DBA is the 2 triangle and DEF and ABC so that according to the figure the total no. of triangle is
8 + 10 + 5 + 2 + 1 + 1
= 27

As magnet has poles similarly battery has terminals.

1st term = 6
2nd term = 6 + 5 = 11
3rd term = 11 + 10 = 21
4th term = 21 + 15 = 36
5th term = 36 + 20 = 56

Thus, Missing Number is 6th term = 56 + 25 = 81

When a drawing is first issued, it is called revision zero or dash (-), and the revision block is empty. As each revision is made to the drawing, an entry is placed in the revision block. This entry will provide the revision number, a summary of the revision, the date of the revision, and the approver’s name.

At ground level the atmospheric pressure is 101.32kPa=1.01 ×10⁵Pa

1kgf=9.81N

1 kgf/cm²=9.81N/cm²=9.81×10⁴N/m²=9.81×10⁴Pa≃1×

10⁵Pa

Internal Energy (U) levels determine end states at those states. For an adiabatic process dQ= zero. In other words, work done in an adiabatic process depends only on the end states (defined by U).

dU + PdV = dH which is enthalpy

According to the third law of motion: For every action, there is an equal and opposite reaction; Recoiling is the backward momentum of a gun to balance the forward momentum of the bullet.

The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as A Dual combustion cycle. The Atkinson-cycle engine is a type of internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power density. A modern variation of this approach is used in some modern automobile engines.

Specific speed (N_S) is the rated speed at some specified operating conditions.

For Pump: Specific speed is defined as the speed of a geometrically similar pump that would deliver unit discharge in m³/s against a unit head in m.

For Turbine: specific speed is defined as the speed of a similar geometrical turbine which would deliver unit power in kW against a unit head in m.

Important point: Specific speed and shape number are two different parameters. Specific speed is a dimensional parameter, whereas a shape number is a dimensionless

parameter. Shape number

The distinction between a solid and a fluid is made based on a substance’s ability to resist an applied shear (tangential) stress that tends to change its shape.

A solid can resist an applied shear by deforming its shape, whereas a fluid deforms continuously under the influence of shear stress, no matter how small its shape is.

A fluid can be defined as a substance that is capable of flowing and changing its shape according to the surrounding without offering internal resistance. Liquid offers no resistance to change of shape, and it conforms to the shape of its surrounding.

Ferrites used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese compounds. They have a low coercivity and are called soft ferrites.

When a fluid flows through a constricted passage, like a partially open valve, an orifice, or a porous plug, there is an appreciable pressure drop, and the flow is said to be throttled.

Throttling is done in an insulated pipe with a partially open valve.

From S.F.E.E,

As the potential and kinetic energy changes are negligible,

Thus S.F.E.E. becomes, h1= h2

i.e., enthalpy remains constant.

An adiabatic process is one in which no heat transfer takes place to or from the system during the process.

An isenthalpic process or iso-enthalpic process is a process that proceeds without any change in enthalpy, H; or specific enthalpy, h

An isentropic process is one in which entropy remains constant (Δs=0)

An isobaric process is a thermodynamic process in which the pressure stays constant: ΔP = 0

An isochoric system is one in which volume is held constant (ΔV=0). Isochoric processes can also be referred to as isometric or isovolumetric

An isothermal process is one in which there is no temperature change (ΔT=0)

The velocity at which the flow enters from the laminar to the transition period is known as lower critical velocity. There is a transition period between the laminar and turbulent flow. It has been experimentally found that when a laminar flow changes into turbulent, it does not change abruptly.

Uncut chip thickness t₁=0.2mm

Cut chip thickness t₂=0.2mm

Chip thickness ratio

When a body moves relative to another body, the friction experienced by the body is dynamic friction. The magnitude of static friction is always greater than that of static friction.