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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  RCFL MT Mechanical Mock Test - 10 - Mechanical Engineering MCQ

RCFL MT Mechanical Mock Test - 10 - Mechanical Engineering MCQ


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30 Questions MCQ Test - RCFL MT Mechanical Mock Test - 10

RCFL MT Mechanical Mock Test - 10 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The RCFL MT Mechanical Mock Test - 10 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The RCFL MT Mechanical Mock Test - 10 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for RCFL MT Mechanical Mock Test - 10 below.
Solutions of RCFL MT Mechanical Mock Test - 10 questions in English are available as part of our course for Mechanical Engineering & RCFL MT Mechanical Mock Test - 10 solutions in Hindi for Mechanical Engineering course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt RCFL MT Mechanical Mock Test - 10 | 100 questions in 90 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study for Mechanical Engineering Exam | Download free PDF with solutions
RCFL MT Mechanical Mock Test - 10 - Question 1
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In a Die-cutting operation, punching several holes in a sheet is called

Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 1
Shearing is a cutting operation used to remove a blank of required dimensions from a large sheet. The shearing operations which make use of a die include punching, blanking, piercing, notching, trimming, and nibbling.

Punching/Blanking: Punching or blanking is a process in which the punch removes a portion of material from the larger piece or a strip of sheet metal. If the small removed piece is discarded, the operation is called punching, whereas if the small removed piece is the useful part and the rest is scrap, the operation is called blanking.

Piercing: It is a process by which a hole is cut (or torn) in metal. It is different from punching in that piercing does not generate a slug.

Perforating: It is an operation in which a number of uniformly spaced holes are punched in a sheet of metal. The holes may be of any size or shape. They usually cover the entire sheet of metal.

Nothing: It is an operation in which a specified small amount of metal is cut from the edges.

Lancing: It is an operation of cutting a sheet metal through a small length and then bending this cut portion.

RCFL MT Mechanical Mock Test - 10 - Question 2
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In the vander waal’s equation, the unit of constant a is

Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 2

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RCFL MT Mechanical Mock Test - 10 - Question 3
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A Pelton turbine is a/an:

Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 3

Impulse Turbine: If the energy available is only kinetic energy at the inlet of the turbine, the turbine is known as an impulse turbine. e.g., a Pelton wheel turbine.

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 direction of the tangent 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 axis of the shaft. Example: Kaplan turbine and propeller turbine

∴ Francis turbine is a radial inward flowing reaction turbine.

RCFL MT Mechanical Mock Test - 10 - Question 4
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Shear force (F) and loading (w) are related by
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 4
Slope of shear force diagram = Load intensity at that section

δF/δx = −w

The slope of bending moment diagram = Shear force at that section

RCFL MT Mechanical Mock Test - 10 - Question 5
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A refrigerator works on a reversed Carnot cycle producing a temperature of -40°C. Work done per TR is 700 kJ per ten minutes. What is the value of its COP?
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 5
Concept

Coefficient of performance of the refrigeration system working on reversed Carnot cycle:

Unit of refrigerating effect = One tonne of refrigeration

1 TR = 3.5 kW

Calculation:

Given: RE = 1 TR = 3.5 kW

W = 700 kJ/ten minutes

COP = 3

RCFL MT Mechanical Mock Test - 10 - Question 6
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The unit of Young’s modulus is the same as
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 6
According to Hooke’s law

Stress-Strain

σ ∝ ϵ

σ = Eϵ

where E is known as Young’s modulus of elasticity.

Since strain (ϵ) is non – dimensional, the unit of E must be the same as those of stress (σ). Thus, E can be expressed in N/mm2, Pa, MPa, GPa, etc.

  • Unit of stress: N/mm2 (MPa)

  • Unit of strain: Dimensionless

  • Unit of Force: N

  • Unit of length: mm

RCFL MT Mechanical Mock Test - 10 - Question 7
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If δQ, ΔE and δW denote the heat added, change in internal energy and work done respectively, in a closed cyclic process then
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 7
According to the first law of thermodynamics

δQ = δW + ΔU

Since internal energy is a point function, so for a cyclic process, a change in internal energy, i.e., ΔU, will be zero (because the initial and final state will be the same).

For the cyclic process:

δQ = δW

∮ δQ = ∮ δW

The first law of thermodynamics states that for a cyclic process, the cyclic integral of heat is equal to the cyclic integral of work.

RCFL MT Mechanical Mock Test - 10 - Question 8
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Hardness of steel depends upon the amount of
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 8
The maximum hardness of a steel is a function of its Carbon content. It increases as the percentage of carbon increases.

Cementite: Cementite or Iron Carbide has the chemical formula Fe3C and contains 6.67% carbon by weight. It is the hardest structure that appears in the iron-carbon equilibrium diagram. Cementite has an orthorhombic crystal structure and is extremely hard and brittle as compared to austenite and ferrite.

Martensite: It is a metastable phase of steel formed by the transformation of austenite below 320°C. Martensite is an interstitial supersaturated solid carbon solution in α – Iron and has a body-centred tetragonal lattice. It has a carbon content of up to 2% and is extremely hard and brittle. It is a product of rapid cooling (quenching) and possesses an acicular or needle-like structure.

The hardness of steel depends upon the amount of cementite. Martensite was obtained after hardening treatment of steel.

Steels with low carbon content do not respond appreciably to hardening treatment because the main constituent is soft ferrite. If hypo-eutectoid steel is cooled rapidly, martensite is formed.

RCFL MT Mechanical Mock Test - 10 - Question 9
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Electrode used in TIG is :
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 9

Introduction of TIG Welding

Gas Tungsten Arc Welding (GTAW), also known as tungsten inert gas (TIG) welding, is a process that produces an electric arc maintained between a non-consumable tungsten electrode and the part to be welded.

Inert Gas in TIG Welding

The heat-affected zone, the molten metal, and the tungsten electrode are all shielded from atmospheric contamination by a blanket of inert gas fed through the GTAW torch.

Inert gas is inactive or deficient inactive chemical properties. The shielding gas serves to blanket the weld and excludes the active properties in the surrounding air. Inert gases, such as Argon and Helium, do not chemically react or combine with other gases.

RCFL MT Mechanical Mock Test - 10 - Question 10
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Which of the following devices is used to find the composition of exhaust gases from IC engines?
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 10

Fuel gas analysis refers to the determination of the composition of exhaust gases. It can be done theoretically and experimentally.

Various devices available for measuring the composition of products of combustion (flue gas) are Orsat Analyzer, Gas chromatograph, Infrared analyzer, and Flame ionization detector, etc.

Orsat Apparatus: It is used for carrying out volumetric analysis of dry products of combustion.

Bomb Calorimeter: It is used to determine the higher calorific value of solid and liquid fuels.

Barometer: A barometer is used to measure local atmospheric pressure.

Rope dynamometer: A rope brake dynamometer is used to test the power of engines.

RCFL MT Mechanical Mock Test - 10 - Question 11
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A 100 H.P. motor with a synchronous speed of 720 rpm at 50 Hz has 96 stator slots with4 conductors per slot and 120 rotor slots with 2 conductors per slot. If the full load efficiencyis 0.92 and the p.f. is 0.9 lagging, the current per phase when the stator is star connected to3-phase, 500V supply will be
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 11

RCFL MT Mechanical Mock Test - 10 - Question 12
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Hot coffee stored in a well insulated thermos flask is an example of
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 12

As the hot coffee remains hot for a long time so neither heat nor mass is exchanged with the surroundings and hence it is an example of isolated system.

RCFL MT Mechanical Mock Test - 10 - Question 13
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Directions: In each of the following questions, a sentence has been given in Active (or Passive) Voice. Out of the four alternatives suggested, select the one that best expresses the same sentence in Passive/ Active Voice.

Darjeeling grows tea.
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 13

The original sentence "Darjeeling grows tea" is in the active voice.

The correct option that expresses the same sentence in the passive voice is:

D. Tea is grown in Darjeeling.

RCFL MT Mechanical Mock Test - 10 - Question 14
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Directions: In the following question, a sentence is given with a blank. You have to fill the blank with one of the words given as options in order to make the sentence contextually and grammatically correct.

Human monkey pox was first identified in 1970 and named after the disease caused by the virus was _______________ in captive monkeys more than a decade before.
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 14

The segment is in passive voice, thus only a verb in third form is eligible for the blank. Among all the given options, only ‘discovered’ fits the blank as the virus already existed in the monkeys but was found in 1970.

Hence, option D is correct.

RCFL MT Mechanical Mock Test - 10 - Question 15
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Direction: In the following questions, Out of four alternatives choose the one which can be substituted for the given words/sentence.

A doctor who treats Children
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 15

Pediatrician: A doctor who treats children

RCFL MT Mechanical Mock Test - 10 - Question 16
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Find out the Synonym of the following word:

HESITATED
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 16
  • Meaning of Hesitated: Pause in indecision before saying or doing something.
  • Meaning of Stopped: (of an event, action, or process) come to an end; cease to happen.
  • Meaning of Paused: interrupt action or speech briefly
  • Meaning of Slowed: reduce one's speed or the speed of a vehicle or process
  • Meaning of Postponed: cause or arrange for (something) to take place at a time later than that first scheduled
RCFL MT Mechanical Mock Test - 10 - Question 17
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Then

P: it struck me
Q: of course
R: suitable it was
S: how eminently

The Proper sequence should be:
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 17

The correct order will be:
Then → it struck me (P)→ how eminently (S)→ suitable it was(R) → of course.(Q)

RCFL MT Mechanical Mock Test - 10 - Question 18
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By rationalising the denominator of we get __________
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 18

When the denominator of an expression contains a term with a square root, the process of converting it to an equivalent expression whose denominator is a rational number is called rationalising the denominator.
By multiplying we will get same expression since 
Therefore, 

RCFL MT Mechanical Mock Test - 10 - Question 19
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The LCM of two numbers is 864 and their HCF is 144. If one of the number is 288, the other number is :
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 19

Using Rule 1 :
1st number × 2nd number = L.C. M. × H.C.F,
Required number

RCFL MT Mechanical Mock Test - 10 - Question 20
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What is the height of an equilateral triangle with 8 cm side?
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 20

Height of an equilateral triangle

Hence, Option A is correct.

RCFL MT Mechanical Mock Test - 10 - Question 21
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A kite is flying at a tallness of 75 m from the level of ground, joined to a string slanted at 60° to the level. The string's length is:
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 21


Let AB be the kite and AC be the level ground
So that BC - AC.
At that point, ∠BAC = 60°and BC = 75m. Let AB = x meters.
Presently AB/BC = coses60° = 2/ √3
=> x/75 = 2/√3 => x = 150/√3 = 150 * √3/3 = 50 √3m.
∴ Length of the string = 50 √3m.

RCFL MT Mechanical Mock Test - 10 - Question 22
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Find the volume of a cuboid whose length is 8 cm, breadth 6 cm and height 3.5 cm. 
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 22
(8×6)×3.5=48×3.5= 168.00cm cube.
RCFL MT Mechanical Mock Test - 10 - Question 23
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Find the number of triangles in the figure.
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 23

The below figure shown the total no. of triangles is 8 + 8 + 2 + 6 + 4 = 28

RCFL MT Mechanical Mock Test - 10 - Question 24
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If a Paper (Transparent Sheet ) is folded in a manner and a design or pattern is drawn. When unfolded this paper appears as given below in the answer figure. Choose the correct answer figure given below.

A square paper is folded in a particular manner and a punch is made. When unfolded the paper appears as given below. Find the manner in which the paper is folded and punch is made.
Question Figure

Answer Figure
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 24

RCFL MT Mechanical Mock Test - 10 - Question 25
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​In this questions, a number series is given with one term missing. Choose the correct alternative that will continue the same pattern and fill in the black spaces.

Q. 0.5, 0.55, 0.65, 0.8, (___)
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 25

1st term = 0.5
2nd term = 0.5 + 0.05 = 0.55
3rd term = 0.55 + 0.1 = 0.65
4th term = 0.65 + 0.15 = 0.8

Thus, missing number is 5th term = 0.8 + 0.2 = 1

RCFL MT Mechanical Mock Test - 10 - Question 26
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Directions to Solve

Each of the following questions has a group. Find out which one of the given alternatives will be another member of the group or of that class.

Question -

Carpenter, Plumber, Electrician
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 26

Carpenter, Plumber, Electrician and Blacksmith are in same working category.

RCFL MT Mechanical Mock Test - 10 - Question 27
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Which one of the answer figures shall complete the given question figure?
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 27

RCFL MT Mechanical Mock Test - 10 - Question 28
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To qualify for a job P, maximum age can be of 30 years, 10th marks should be more than 50% and work experience should be at least 3 years. To qualify for job Q, one should have a minimum age of 25 years, 10th marks should be more than 60% and work experience of at least 1 year. Rahul has 48% marks in 10th an age of 28 years and. work experience of 5 years. For which of these jobs does he qualify?
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 28

The logic follows here is:

It is given that Rahul has 48% marks in 10th, an age of 28 years, and work experience of 5 years.

It is clearly mentioned in the criteria that 10th marks should be greater than 50% for job P and greater than 60% for job Q. Rahul got 48% marks in 10th.

Therefore, Rahul, neither qualifies for job P nor for job Q.

Hence, the correct answer is "Neither P nor Q".

RCFL MT Mechanical Mock Test - 10 - Question 29
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Which Indian state passed a bill aimed at curbing illegal immigration?
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 29

The Haryana Assembly passed a bill aimed at curbing illegal immigration, addressing concerns regarding the activities of unregistered travel agents. This legislative action reflects the state's efforts to tackle issues related to immigration and safeguard the interests of its residents.

RCFL MT Mechanical Mock Test - 10 - Question 30
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What is the highest decision-making body of the United Nations?
Detailed Solution for RCFL MT Mechanical Mock Test - 10 - Question 30

The Security Council is the primary authority for maintaining international peace and security within the UN.

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