RCFL MT Mechanical Mock Test - 5 - Mechanical Engineering MCQ

Pressure Angle is the measure of the steepness of the cam profile. The angle between the direction of the follower movement and the normal to the pitch curve at any point is called pressure angle. Pressure angle varies from maximum to minimum during complete rotation.

The pressure should not exceed 30^० in the case of cams with translating followers (and angle should be less than 45^० for low-speed cam mechanisms with oscillating followers).

Since entropy is a point function that depends only on states i.e., independent of the path followed.

So the change of entropy will be zero when the process undergoes a complete cycle (where the initial state and final state are the same).

The flow rate through a pipe is usually measured by providing a coaxial area contraction within the pipe and by recording the pressure drop across the contraction, which is the application of Bernoulli’s equation.

Three flow meters primarily operate on this principle:

- Venturimeter

- Orificemeter

- Pitot tube

Hole basis system: The hole is kept as a constant member (i.e. when the lower deviation of the hole is zero).

Shaft basis system: When the shaft is kept as a constant member (i.e. when the upper deviation of the shaft is zero).

The efficiency of Carnot engine (η_E) = 50%

η_E=1−TLTH=0.5

Now, this is converted to the heat pump,

Dividing by T_H

Short trick:

If a Carnot heat engine which is operating between two temperature limits is converted to a heat pump, then

Aluminium casting alloys offer a range of advantages, particularly good castability. This includes a relatively high fluidity, low melting point, short casting cycles, relatively low tendency for hot cracking, good as-cast surface finish, and chemical stability.

Hooke's law states that the force applied to an elastic material is directly proportional to the extension produced. Therefore Hooke's law holds good up to limit of proportionality.

Change in length of the bar:

δL = PL/AE

The ratio between the force and deflection is referred to as the spring rate or stiffness of the beam or coil.

Equivalent spring constant:

k = F/x = P/δL = AE/L

Stress = force per unit area, i.e. F / A or N/m²

Strain = change in length per unit original length, i.e. m/m or mm/mm.

Hooke’s Law holds good up to the proportional limit.

According to Hooke’s Law, stress is directly proportional to strain within the elastic limit.

Note: Stress is not pressure per unit area because pressure itself is force per unit area.

Two-stroke engines often have a high power-to-weight ratio. Compared to four-stroke engines, two-stroke engines have a greatly reduced number of moving parts and so can be more compact and significantly lighter.

Important Point:

Two-stroke engines: In this engine, one power stroke is obtained in each revolution of the crankshaft

Four-stroke engines: In this type of engine, one power stroke is obtained in two revolutions of the crankshaft

For two coupled cycle in series

η=1−(1−η₁)(1−η₂)

=1−[1−η₁−η₂+η1⋅η₂]

=η₁+η₂−η₁⋅η₂

= 0.5 + 0.6 – 0.5 × 0.6 = 0.80

Rash means acting or done without careful consideration of the possible consequences

Some of the synonyms are- reckless, impetuous, impulsive, hasty, overhasty, foolhardy, incautious, precipitate, precipitous, premature, careless, heedless, thoughtless, imprudent, foolish

Countries need to stop and think this through and not make any rash decisions before starting a war

Due to rash attack by the enemies, the army was able to overpower them

• 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

One word substitution is Cynic.
Egoist: a self-centered or selfish person
Fatalist: one who accepts all things and events as inevitable.
Stoic: a person who can endure pain or hardship without showing their feelings or complaining.
Cynic: a person who believes that people are motivated purely by self-interest rather than acting for honourable or unselfish reasons.

As we know that ,
Delectable is delightful or pleasant, distasteful is something unpleasant, agonizing is something that gives pain and anxiety, appetizing means to rouse or increase appetite, laborious means something that needs or shows much effort.
Thus , Distasteful is antonym ( opposite ) word of Delectable . 

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

Let total work be LCM of (90, 60) = 180 unit
Ratio of number of days by Sarthak and Deepak = 90 : 60 = 3 : 2
Ratio of efficiency of Sarthak and Deepak = 2 : 3
Total unit in one day = 2 + 3 = 5 unit
Number of days taken = 180/5 = 36 days 
Hence, Option B is correct.

Let the length of bamboo be x metres.
Length of bamboo above water

Hence, Option D is correct.

Sure, let's find the correct answer for the given problem.

144 : 10 :: 169 : ?

- 144 is a perfect square (12²) and its square root is 12.
- 12 is then reduced to 10 by subtracting 2 (12 - 2 = 10).
- Similarly, 169 is a perfect square (13²) and its square root is 13.
- Following the same pattern, subtract 2 from 13 (13 - 2 = 11).

Thus, the correct answer is:

B: 11

- 169 : 11

Let the number be x.

According to the question,

⇒ 80% of x - 80 = 80

⇒ 80% of x = 80 + 80

⇒ (80/100)x = 160

⇒ 80x = 160 × 100

⇒ x = 16000/80

⇒ x = 200

Hence, the correct answer is "200".

The logic followed here is:

In figure 1:

32 = (2 + 2) × 8

4 × 8

32

In figure 2:

24 = (3 + 1) × 6

4 × 6

24

Similarly,

In figure 3:

45 = (4 + ?) × 5 

4 + ? = 9

? = 9 - 4

? = 5

Hence, the correct answer is "5".

The New York Times (NYT) has taken legal action against OpenAI and Microsoft, accusing them of unauthorized usage of its copyrighted content for AI model training, notably ChatGPT. This legal dispute highlights the broader debate on intellectual property rights in the generative AI era.

The correct answer is option (C). Abolition to Sati and Legislation of widow marriage were disliked by hindus and made them dislike the British.
Due to fierce campaign and lobbying of Raja Rammohan Roy and others,Sati practice was formally banned in all the lands under Bengal Presidency by Lord William Bentinck on 4 December 1829. By this regulation, the people who abetted sati were declared guilty of “culpable homicide.”
The Hindu Widows' Remarriage Act, 1856, also Act XV, 1856, enacted on 26 July 1856, legalised the remarriage of Hindu widows in all jurisdictions of India under East India Company rule. It was drafted by Lord Dalhousie and passed by Lord Dalhousie before the Indian Rebellion of 1857.

Collateral refers to an asset owned by the borrower, such as land, building, vehicle, livestock, or deposits with banks, that is offered as security to the lender until the loan is repaid. In the event of loan default, the lender has the right to sell the collateral to recover the outstanding amount. Collateral provides a level of assurance to the lender and reduces the risk associated with lending, making it a common practice in credit agreements.