RCFL MT Mechanical Mock Test - 2 - Mechanical Engineering MCQ

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.

Flat-faced or mushroom follower: When the contacting end of the follower is a perfectly flat face, it is called a flat-faced follower.

Knife edge follower: When the contacting end of the follower has a sharp knife edge, it is called a knife-edge follower.

(a) Knife edged, (b) Roller Follower, (c) Flat or Mushroom Follower (d) Spherical faced Follower

Thus, the number of molecules or atoms in a specific volume of an ideal gas is independent of their size or the molar mass of the gas. For example, 1.00 L of N₂ gas and 1.00 L of Cl₂ gas contain the same number of molecules at Standard Temperature and Pressure (STP).

1. U-tube differential manometer

2. Inverted U-tube differential manometer

The total number of Instantaneous center of rotations is equal to combining two links out of n links.

So ⁿC₂ = n(n-1)/2

Mistake: Don’t confuse here that as one link is fixed so the Instantaneous center of rotations will vanish, and the answer you will get is ^n-1C₂ = (n-1)(n-2)/2. This is incorrect.

Surging is caused due to unsteady, periodic and reversal of flow through the compressor when the compressor has to operate at less mass flow rate than a predetermined value

Percentage of one phase = xz/xy × 100

Similarly, for another phase = xy/xy × 100

1. Ammonia: It is the primary refrigerant that takes heat from brine. This ammonia changes phase while moving in the circuit.

2. Brine: It is the secondary refrigerant that takes heat from the water and produces ice.

There are three main circuits of working medium in ice plant:

Refrigeration circuit: Ammonia as working medium which actually produces the cold by changes its phase at a single degree of freedom with a different location

Cooling water circuit: Cooling water as a working medium to remove the heat of the condenser

Brine circuit: Brine solution as a working medium which transfers the cold from ammonia to water-filled cans where ice is to be formed.

Reynolds;Number = Inertia;force/Viscous;force

Froude;Number = Inertia;force/Gravity;force

Weber;Number = Inertia;force/Surface;tension;force

So a minimum of four links is necessary to form a kinematic chain.

Correct Answer :- d

Explanation : Wrought iron is an iron alloy with very low carbon content with respect to cast iron. It is soft, ductile, magnetic, and has high elasticity and tensile strength. It can be heated and reheated and worked into various shapes.

There are three classes of systems:

1. Closed system

2. Open system

3. Isolated system

Closed system: The system of fixed mass is called the closed system. There is no mass transfer across the system boundary. The energy transfer into or out of the system may happen.

The arrangement of a piston-cylinder with a certain quantity of fluid is an example of a closed system.

Open system: The open system is one in which matter crosses the boundary of the system. The energy transfer into or out of the system may happen.

Most of the engineering devices are open systems, Air compressors, turbines, pumps, etc., are examples of the open system.

Isolated system: The isolated system is one in which there is no interaction between the system and surroundings. It is of fixed mass and energy, and there is no mass or energy transfer across the system boundary.

A thermos flask and the universe is the example of an isolated system.

The hardenability of steel depends upon the actual rate at which its austenite transforms to fine pearlite at the particular temperature at which this reaction sets in most promptly. The finer the grain, the more rapid the transformation is to fine pearlite, and correspondingly the lower is the hardenability.

• Sherardizing (Zinc coating)

• Calorizing (Aluminium coating)

• Chromizing (Chromium coating)

Anodizing: Anodizing is to provide a decorative and corrosion-resistant coating on aluminium and its alloys only.

A thin coating of oxide on aluminium can protect the surface from corrosion.

Aluminium is ideally suited to anodizing, although other non-ferrous metals such as magnesium and titanium also can be anodized.

Parkerising is a process used for making thin phosphate coating on steel.

Galvanizing: It is a process of giving a protective coating of zinc on iron sheets and components to protect the surface from corrosion. It is the process of coating of zinc by hot-dipping.

Tongue in cheek: a humorous or sarcastic statement expressed in a serious manner; in an ironic, flippant, or insincere way.
Above someone’s station: higher than suitable for position or rank.
Agitate the gravel: to get angry.
Be thin on the ground: exist in small numbers or amounts.
Hence, the correct answer is option A. 

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.

The given sentence in active voice is: "Ads on TV increase the sale of any commodity."

The correct transformation of this sentence into the passive voice is: "The sale of any commodity is increased by ads on TV."

Therefore, the correct answer is option B: "The sale of any commodity is increased by ads on TV."

Meaning of brief: of short duration; not lasting for long.

Additional Information:

• Meaning of Limited: small or controlled in number, amount, etc.
• Meaning of Small: not large in size, number, amount, etc.
• Meaning of Little: not big; small

The average weight of A, B, C and D = 68 kg
The average weight of A, B, C, D and E = 70 kg
So the answer = 70 × 5 – 68 × 4 = 78 kg
Hence, Option A is correct.

Remainder,

[We have taken individual remainder, which means if 73 is divided by 34 individually, it will give remainder 5, 75 divided 34 gives remainder 7 and so on.]

[We have taken here negative as well as positive remainder at the same time. When 30 divided by 34 it will give either positive remainder 30 or negative remainder -4. We can use any one of negative or positive remainder at any time.]

Required remainder = 32.

- 5 / 4 + x = -1

x = -1 + 5 / 4

x = (-4 + 5) / 4

x = 1 / 4

1m³ = 1000 L and 1m³=1000000cm³ and 1000L= 1000000ml
So 1000000cm³ = 1000000ml which is 1ml = 1cm³

Since pyramid has length ,width and height so it will be 3D

By travelling at 10 kmph higher than the original speed, the train is able to make up 16 minutes
while traveling 80 km.
This condition is only satisfied at an initial speed of 50 (and a new speed of 60 kmph).

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

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".

D is the correct option.Sena Dynasty ruled Bengal for little over a century (c 1097-1225).  Sena rule in Bengal is that the whole of Bengal was brought under a single rule .Senas came to Bengal along with some invaders from the Deccan.

The correct answer is 'Jarag da mela'.

Key Points

• Jarag da Mela is one of the most popular fairs in Punjab.
• It is held every year in Jarag located in Pail village of Ludhiana.
• The Ludhiana Mela is also known as the Beheria Mela.
• In this fair Hindu goddess Seetala and her Vahana, donkeys are worshipped.
• Generally, the Ludhiana Jarag Mela is held in the month of March and April (Chaitra).

Additional Information

• Jagraon di roshini
  • ​This fair is held in Jagranvan from the 14th to the 16th of Phagun in honor of a Muslim Pir, Abdul Kader Jalani.
  • It is called the ‘fair of lights’ because innumerable devotees who come to visit the place light earthen lamps at the shrine of the pir.
• Chappar da mela
  • ​This fair is held on Anand Chaudas, the 14th day of the bright half of Bhadon in honor of Gugga Pir.
  • He was believed to possess special power over all kinds of snakes.
  • The fair lasts three days.