RCFL MT Mechanical Mock Test - 6 - Mechanical Engineering MCQ

Degree of reaction

In the case of an impulse turbine, there is no change in the enthalpy in rotor, so degree of reaction is zero.

R=0

And for Parson's turbine or 50% reaction turbine R=0.5 and for

Hero's turbine

The overall efficiency η₀ of turbine = volumetric efficiency (η_v)× hydraulic efficiency (η_n)× mechanical efficiency (η_m)

η_o=ηv×η_h×η_m

Overall efficiency.

Water Power =ρ×Q×g×h

Calculation:

Given, η0=0.8, head h=10m/s and Q=1m³/s

The Electrolux principle works on a 3-fluid system.

There is no solution circulation pump.

The total pressure is the same throughout the system.

The third fluid remains mainly in the evaporator, thus reducing the refrigerant’s partial pressure to evaporate at low pressure and hence low temperature.

Example: An Electrolux refrigerator working on NH₃ – H₂O system with H₂ as the third fluid. Liquid NH₃ evaporates in the evaporator in the presence of H2. Hydrogen is chosen as it is non-corrosive and insoluble in water.

thus, the unit of dynamic viscosity is N−s/m² or kg/(m.sec), and dimension is ML

⁻¹T⁻¹

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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.

Stainless steel has more than 10.5% chromium and less than 1.2% carbon.

Stainless steels typically contain chromium besides other elements like C, Mn, Si, S, etc. Chromium imparts corrosion resistance to steel.

One important type of stainless steel is often described as 18/8 steel, where chromium and nickel percentages are 18 and 8, respectively.

A typical designation of stainless steel is 15Si2Mn2Cr18Ni8, where carbon percentage is 0.15.

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

A system is said to be in thermodynamic equilibrium if the conditions for the following all three equilibrium is satisfied:

1) Mechanical equilibrium: When there are no unbalanced forces within the system and between the system and the surrounding, the system is under mechanical equilibrium.

2) Chemical equilibrium: The system is said to be in chemical equilibrium when no chemical reactions are going on within the system. There is no transfer of matter from one part of the system to another due to diffusion.

3) Thermal equilibrium: When the temperature of the system is uniform and not changing throughout the system and also in the surroundings, the system is said to be in thermal equilibrium.

surface tension is often expressed as an amount of force exerted in the surface perpendicular to a line of unit length. The unit then is newtons per metre, which is equivalent to joules per square metre.

Answer : b

Stoichiometric ratio is Chemically correct air-fuel ratio by volume.

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.

The V-belts are made of fabric and cords moulded in rubber and covered with fabric and rubber. These belts are moulded to a trapezoidal shape and are made endless. These are particularly suitable for short drives. The included angle for the V-belt is usually from 30° to 40°.

It is the ratio of thermal efficiency of the engine to the air standard cycle efficiency on which it works.

Volumetric Efficiency (η_V)

The film of oil completely separates the sliding surfaces. The ratio of the sliding surface ratio of the actual volume of air goes to the cylinder for the stroke or swept volume of the cylinder.

Mechanical Efficiency (n_m)

It is the ratio of brake power to indicated power.

Length of cycle = t₀

As lead time is 13 days and cycle length is 10 days .recorded point

= (13 − 10 × 100) = 300 units

Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions.

A site plan usually shows a building footprint, travel ways, parking, drainage facilities, sanitary sewer lines, water lines, trails, lighting, and landscaping and garden elements. A site plan is a "set of construction drawings that a builder or contractor uses to make improvements to a property.

As we know that ,
Sublime is magnificent and great, base is anything low, ordinary, concise means short or compact, partial is not complete, and Insist is to make a request.
Therefore , required word is base . 

• Canny: Intelligent and showing good judgement especially in business or politics.
• Stout: Fat
• Handsome: Attractive
• Obstinate: Refusing to change your opinion, behaviour.

So, the answer is clever.

Unscrupulous means having or showing no moral principles whereas conscientious means wishing to do one's work or duty well. Therefore, Unscrupulous is the antonym of Conscientious. 

The sentence is in active voice with past continuous tense in it. When it is converted into passive voice, it still remains in past continuous tense but with a little variance due to its grammatical rule. In the sentence ‘was driving the car’ gets converted into ‘was being driven’ in case of passive voice.
Passive voice is given as :-
The car was being driven by him so fast that it skidded on the snowy road.
Hence , option D will be correct answer .

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.

Narrow is a synonym of insular.

The word that can be prefixed to make the following new words is ‘Mis’.

Mis + Interpret = Misinterpret

Mis + Behave = Misbehave

Mis + Understand = Misunderstand

Mis + Take = Mistake

CEDH -- Reverse it ---> HDEC.

VRNP -- Reverse it ---> PNRV.

Therefore VRNP is the answer.

• The correct answer is Rs 1,34,836 crore.

Key Points

• The estimated expenditure (excluding debt repayment) for the state of Punjab in 2023-24 is Rs 1,34,836 crore.
• An increase of 5.9% over the revised estimates of 2022-23.
• In addition, debt of Rs 61,626 crore will be repaid by the state.

Additional Information

• The estimated revenue deficit in 2023-24 for the state of Punjab is 3.5% of GSDP (Rs 24,589 crore).
• This is lower than the expected revenue deficit for the previous year, which was 3.7% of GSDP.
• The targeted fiscal deficit for 2023-24 for the state of Punjab is 5% of GSDP (Rs 34,784 crore).
• This is slightly lower than the estimated fiscal deficit for the previous year, which was 5.2% of GSDP.

Kanchenjunga is the highest mountain peak in India and ranked 3rd highest peak in the world with an elevation of 8,586 m (28,169 ft). It is situated at the border of India and Nepal in the Himalayas range in Sikkim. Anamudi is the highest peak in the Western Ghats in India and also the highest point in South India.