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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  RCFL MT Mechanical Mock Test Series 2025  >  RCFL MT Mechanical Mock Test - 4 - Mechanical Engineering MCQ

RCFL MT Mechanical Mock Test - 4 - Mechanical Engineering MCQ


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30 Questions MCQ Test RCFL MT Mechanical Mock Test Series 2025 - RCFL MT Mechanical Mock Test - 4

RCFL MT Mechanical Mock Test - 4 for Mechanical Engineering 2025 is part of RCFL MT Mechanical Mock Test Series 2025 preparation. The RCFL MT Mechanical Mock Test - 4 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The RCFL MT Mechanical Mock Test - 4 MCQs are made for Mechanical Engineering 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for RCFL MT Mechanical Mock Test - 4 below.
Solutions of RCFL MT Mechanical Mock Test - 4 questions in English are available as part of our RCFL MT Mechanical Mock Test Series 2025 for Mechanical Engineering & RCFL MT Mechanical Mock Test - 4 solutions in Hindi for RCFL MT Mechanical Mock Test Series 2025 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 - 4 | 100 questions in 90 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study RCFL MT Mechanical Mock Test Series 2025 for Mechanical Engineering Exam | Download free PDF with solutions
RCFL MT Mechanical Mock Test - 4 - Question 1
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Polygon of forces is useful for computing the resultant of

Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 1
Polygon of forces is useful for computing the resultant of coplanar concurrent forces.

Polygon Law of forces

It states that if a number of concurrent forces acting on a particle are represented in magnitude and direction by the sides of a polygon, taken in order, then their resultant is represented in magnitude and direction by the closing side of the polygon, taken in the opposite order.

A system of concurrent coplanar forces acting on a particle are:

(a) Given system (b) Resultant of given forces

RCFL MT Mechanical Mock Test - 4 - Question 2
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A refrigerator maintains a temperature of 270 K in a room at 300 K. If heat is removed from the interior at a rate of 900 J/sec and the refrigerator operates at 50% of its maximum thermal efficiency, the power requirement is

Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 2

Maximum COP is of Carnot COP:

W = 900/4.5 = 200 J/sec

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RCFL MT Mechanical Mock Test - 4 - Question 3
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________ gear train is used to connect minute hand to hour hand, in a clock mechanism.

Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 3
When the axes of the first gear and the last gear are co-axial, then the gear train is known as the reverted gear train. The reverted gear trains are used in automotive transmissions, lathe back gears, industrial speed reducers, and in clocks (where the minute and hour hand shafts are co-axial).

The epicyclic gear trains are useful for transmitting high-velocity ratios with gears of moderate size in a comparatively lesser space. The epicyclic gear trains are used in the back gear of lathe, differential gears of the automobiles, hoists, pulley blocks, wristwatches, etc.

RCFL MT Mechanical Mock Test - 4 - Question 4
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A milling cutter is mounted on the part of a milling machine called
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 4
A milling machine is a machine tool in which metal is removed by means of a revolving cutter with many teeth, each tooth having a cutting edge that removes metal from a workpiece.

The work is supported by various methods on the work table and may be fed to the cutter, longitudinally, transversely, or vertically.

Some parts of the horizontal milling machine:

Arbor:

  • Its one end is attached to the column, and the other end is supported by an overarm

  • It holds and drives different types of milling cutters

Spindle:

  • It gets power from gears and belt drives to drive the motor

  • It has provision to add or remove milling cutters onto the arbor

RCFL MT Mechanical Mock Test - 4 - Question 5
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In a mechanical refrigeration system, the refrigerant has the maximum temperature:
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 5
The exit condition after evaporation is a saturated vapour that is compressed in the compressor and becomes superheated (having the maximum temperature) and then passed to the condenser.

RCFL MT Mechanical Mock Test - 4 - Question 6
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The heat loss in a boiler takes place in the form of ________.
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 6
Balancing total energy entering a boiler against the energy that leaves the boiler in different forms

RCFL MT Mechanical Mock Test - 4 - Question 7
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If an object is moving on a circular path, its speed is-
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 7

Objects moving in a uniform circular motion will have a constant speed. The magnitude of the velocity vector is the instantaneous speed of the object. The direction of the velocity vector is directed in the same direction that the object moves.

RCFL MT Mechanical Mock Test - 4 - Question 8
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Fluid is a substance which offers no resistance to change of
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 8

RCFL MT Mechanical Mock Test - 4 - Question 9
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In order to avoid separation in the Venturi meter, the angle of divergence is kept
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 9

In the diverging portion, there is a decrease in velocity & a subsequent increase in pressure. If the divergence angle is very large, then backpressure will increase by a great extent & eddies formation will take place, resulting in flow separation. Thus, to avoid flow separation, the divergence angle must not exceed more than 7°, and the range should be around 5 - 7°.

RCFL MT Mechanical Mock Test - 4 - Question 10
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Which of the following temperature is the highest?
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 10

Physical properties of all metals in pure form, tungsten has the highest melting point (3,422 °C, 6,192 °F), lowest vapour pressure (at temperatures above 1,650 °C, 3,000 °F), and the highest tensile strength.

48K is the lowest being only 48 degrees Kelvin (K) above absolute zero, equivalent to minus 225.15 degrees Centigrade. The next lowest temperature is 5 degrees Centigrade (278.15 degrees Kelvin). Finally, the highest temperature is 122 degrees Fahrenheit (50 degrees Centigrade or 323.15 degrees Kelvin).

RCFL MT Mechanical Mock Test - 4 - Question 11
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The continuity for a steady flow that
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 11
The law of conservation of mass states that mass may neither be created nor destroyed. With respect to a control volume, the law of conservation of mass may be simply stated as

(Rate of mass efflux from control volume)-(Rate of mass flow into control volume)+(Rate of accumulation of mass within control volume) = 0

The net outward flow of mass across the control surface or the net mass efflux from the control volume:

The rate of accumulation of mass within the control volume:

Direction of flow→

Fluid flowing through a pipe

∴ The continuity for a steady flow that efflux rate of mass through the control surfaces is zero.

RCFL MT Mechanical Mock Test - 4 - Question 12
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Tool life decreases by decreasing
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 12
The tool life obviously decreases with the increase in cutting velocity, feed, and depth of cut.

Nose radius:

  • A nose radius on the tool is favourable for long tool life.
  • A nominal sharp tool is highly stressed at the tip and has a short tool life.
  • An increase in nose radius improves the tool’s life.
  • An increase in nose radius also increases the cutting forces and induces chatter. Therefore, the optimum range of nose radius is 0.5 – 2.5 mm.

RCFL MT Mechanical Mock Test - 4 - Question 13
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Directions: In the question below, three statements are given with a phrase or an idiom highlighted as underline. They might be contextually or grammatically incorrect. Select the answer choice that states the combination of statements in which the idiom or the phrase has been correctly used.

I. She felt like the belle of the ball as she danced the night away with her beau.
II. The linebacker made a beeline for the quarterback when he saw an opening.
III. Many children broke one’s neck how technology works.
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 13

Belle of the ball: the most beautiful woman in a gathering.
The usage of the idiom in statement I is absolutely correct.
Make a beeline: to go straight for something.
The usage of the idiom in statement II is absolutely correct.
Break one’s neck: get through the hardest part of something.
The idiom is incorrectly used in the sentence and the correct idiom will be ‘do not have a clue’.
Not have a clue: to not know something.
Hence, the correct answer is option C. 

RCFL MT Mechanical Mock Test - 4 - Question 14
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Find out the Synonym of the following word:

FAKE
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 14
  • Meaning of Fake: Not genuine, imitation or counterfeit.
  • Meaning of Original: present or existing from the beginning; first or earliest
  • Meaning of Trustworthy: able to be relied on as honest or truthful
  • Meaning of Loyal: giving or showing firm and constant support or allegiance to a person or institution
RCFL MT Mechanical Mock Test - 4 - Question 15
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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.

Shut the door.
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 15

The passive voice of imperative sentences which suggest order, suggestion or request can be made in two ways:

Active: Verb + object

Passive:

Let + object + be + past participle
You are requested/ ordered/ suggested + to + verb (Ist form) + object
Going by first way of passive voice, the passive voice of the given sentence would be: Let the door be shut.

RCFL MT Mechanical Mock Test - 4 - Question 16
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Direction: In the following questions, out of the four alternatives, choose the word opposite in meaning to the given word.

Feasible
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 16

The word Feasible (Adjective) means : that is possible and likely to be achieved; practicable.
Its antonym should be impractical. 

RCFL MT Mechanical Mock Test - 4 - Question 17
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Direction: In the following questions choose the word opposite in meaning to the given word.

Appreciation
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 17

The meaning of word Appreciation (Noun) is: Thankfulness. It’s antonym should be: Aspersions, e.g, to criticize harshly.

RCFL MT Mechanical Mock Test - 4 - Question 18
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The rational number between 1 and 2 is
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 18

Remember the general formula to find rational number between two

given number 1/2(a+b)[where a, b are given numbers]

A rational number between 1 and 2 is 1/2(1+2)=3/2

RCFL MT Mechanical Mock Test - 4 - Question 19
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Simplify 8√35 (÷) 4√5
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 19

On simplification,

√35 = √(7x5) = √7 x √5
= 8√35 = 8 x √7 x √5
= 8 x √7 x √5
     4 x √5
=2√7

RCFL MT Mechanical Mock Test - 4 - Question 20
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The diameter of a circle is half the side of a square whose area is 144 cm2. What is the area of the circle?
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 20

Side of the square = √144 = 12 cm

So the answer = π × 3 × 3 = 9π cm2 

RCFL MT Mechanical Mock Test - 4 - Question 21
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A student was asked to find  of a number. By mistake he found  of that number. His answer was 250 more than the correct answer. Find the given number.
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 21

Let the number = x

RCFL MT Mechanical Mock Test - 4 - Question 22
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The complement of 30°20′ is:
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 22

Complement of 30°20′ = 90° – ( 30°20′ ) = 90° – ( 30° + 20′ )
= (89° – 30°) + (1° – 20′)
= 59° + 60′ – 20′ [ ∴ 1° = 60°′]
= 59° + 40′ = 59°40′.

RCFL MT Mechanical Mock Test - 4 - Question 23
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The average of 8 numbers 12, 19, 23, 7, ‘x’, 9, 26 and 13 is 16. What is the value of ‘x’?
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 23

12 + 19 + 23 + 7 + x + 9 + 26 + 13 = 16 × 8
109 + x = 128
x = 128 – 109 = 19
Hence, Option D is correct.

RCFL MT Mechanical Mock Test - 4 - Question 24
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The HCF of two numbers is 23 and the other two factors of their LCM are 13 and 14. The larger of the two numbers is :
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 24

Let the numbers be 23x and 23y where x and y are co-prime.
∴ LCM = 23 xy
As given,
23xy = 23 × 13 × 14
∴ x = 13, y = 14
∴ The larger number = 23y
= 23 × 14 = 322

RCFL MT Mechanical Mock Test - 4 - Question 25
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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 piece of paper is folded and cut as shown below in the question figures. From the given answer figures, indicate how it will appear when opened.

Question Figure

Answer Figure
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 25

RCFL MT Mechanical Mock Test - 4 - Question 26
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Directions to Solve

In each of the following questions find out the alternative which will replace the question mark.

Question -

Corden : zrogbq :: ? : pxivro
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 26

RCFL MT Mechanical Mock Test - 4 - Question 27
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If PAPER is coded as QCSIW then in that code EXAMPLE is written as
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 27

The logic follows here is:

Pattern: Letter increased by +1, +2, +3, +4, +5, +6 and so on.

Similarly,

Hence, "FZDQURL" is the correct answer.

RCFL MT Mechanical Mock Test - 4 - Question 28
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Punjab was formed in _________.
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 28

The correct answer is option (1) i.e. 1 November 1966.

  • Punjab Province in British India was divided into East Punjab and West Punjab.
  • East Punjab is in India and West Punjab is in Pakistan.
  • Chandigarh is the capital of both the states Haryana and Punjab, earlier Haryana was a part of Punjab till 1 November 1966.
  • Amarinder Singh is the Chief Minister and V. P. Singh Badnore is the present governor of the state. (May 2020)
  • Punjab is known as 'The land of five rivers'.
  • Vaisakhi is the main festival of the state.
RCFL MT Mechanical Mock Test - 4 - Question 29
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In which Mughal emperor ’s reign did the administration deteriorate as a result of his reckless grants of jagirs and promotions?
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 29
  • There was further deterioration in the field of administration in Bahadur Shah's reign.
  • The position of state finances worsened as a result of his reckless grants of jagirs and promotions.
  • During his reign the remnants of the Royal treasure, amounting in 1707 to some 13 crores of rupees, were exhausted.

Hence, the correct option is 'A'.

RCFL MT Mechanical Mock Test - 4 - Question 30
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What are the three main indicators of the Human Development Index (HDI)?
Detailed Solution for RCFL MT Mechanical Mock Test - 4 - Question 30

The three main indicators of the Human Development Index (HDI) are life expectancy at birth, gross enrollment ratio, and per capita income. These indicators provide a comprehensive measure of a country's development, encompassing health, education, and economic well-being.

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