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 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

The work is the path function so the work transfer between the system and the surrounding depend on the path that followed by tha system.

The crystal structure of a material is generally examined by X-ray techniques.

Concept:

Mass M= density × volume

M=ρ×V where ρ in kg/m³ and V in m³

Calculation:

Given, S.G,=2.5 and volume V=1 lit.

Density ρ=2.5×1000=2500kg/m³ and volume V=1×10⁻³=

0.001m³

Mass M = 2500 x 0.001 = 2.5 Kg

Rammer's Super Blunt tool is designed to deliver the maximum force of a hammer's impact energy directly into boulders. The Super Blunt is only designed to be used in boulder breaking applications, where it provides 1.5...3 times more wear life than a standard blunt tool.

Answer : b

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

From Merchant Circle

'Bainite' named for E.C. Bain is the generic term for fine aggregates of ferrite (α) platelets (or laths) separated by regions of residual phases, untransformed austenite (γ), or cementite (θ). The transformation occurs from austenite (γ) at temperatures between those at which pearlite and martensite form.

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°.

Grasp (G): grasping an object with the active hand. Transport loaded (TL): moving an object using a hand motion. Hold (H): holding an object.

Primary refrigerants are those fluids used directly as working fluids, for example, in VCR and absorption-based systems. When used in compression or absorption systems, these fluids provide refrigeration by undergoing a phase change process in the evaporator.

As the name implies, secondary refrigerants are those liquids used for transporting thermal energy from one location to another. Secondary refrigerants are also known referred to as brines or antifreeze.

Two or more refrigerants can be suitably blended to achieve the required/desired properties. These are Zeotropes and Azeotropes. Azeotropic mixtures are designated by 500 series, whereas zeotropic refrigerants (e.g., non-azeotropic mixtures) are designated by 400 series.

Azeotropic refrigerants: A stable mixture of two or several refrigerants whose vapor and liquid phases retain identical compositions over a wide range of temperatures. Examples: R-500: 73.8% R12 and 26.2% R152

Zeotropic refrigerants: Azeotropic mixture is one whose composition in the liquid phase differs from that in the vapor phase. Zeotropic refrigerants, therefore, do not boil at constant temperatures, unlike azeotropic refrigerants. Examples: R404a : R125/143a/134a (44%, 52%, 4%)

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.

Esteemed means regarded with respect, honored, prestigious

The esteemed panel discussed crucial issues on a televised debate

The esteemed judge ruled in the favor of convict due to lack of evidence

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 .

Let AB be the observer and CD be the tower.

Draw BE ⊥ CD.

Then, CE = AB = 1.6 m,

BE = AC = 20√3 m.

∴ CD = CE + DE = (1.6 + 20) m = 21.6 m.

3.14 x 10⁶ = 3.14 x 1000000 = 3140000.

Time → A : C = 40 : 90 = 4 : 9
Efficiency → A : C = 9 : 4

Hence, Option D is correct.

T is the daughter of R.

The logic is x³ : (x+1)³ + 1
                   2³ : (2 + 1)³ + 1
                   2³ : 3³ + 1
                   8  :  28
27 = 3³
so next digit (n+1)³ + 1 = (3 + 1)³ + 1 = 64 + 1 = 65

From Statement 1:

C = X ≤ D ≥ R

From the statement, the conclusion H < D is not followed because H is absent.

From Statement 2:

R > Z = O > H

From the statement, the conclusion H < D is not followed because D is absent.

From Statement1 and Statement2:

We have, C = X ≤ D ≥ R > Z = O > H

From the statement, H < O = Z < R ≤ D, the conclusion H < D is followed.

Hence option D is correct.

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

As 335 - 216 = 119

Similarly, 987 - X = 119

Therefore, X = 987 - 119 = 868.

The correct answer is 'Gurdial Singh'.

Key Points

• Gurdial Singh Rahi was an Indian writer and novelist who wrote in Punjabi.
• He was awarded the Jnanpith award in the year 1999 along with Hindi writer, Nirmal Verma for his overall contributions to Punjabi literature.
• Singh was also honored with the Padma Shri in 1998.
• Gurdial Singh got the Sahitya Academy award for his novel ‘Marhi Da Diva’.

• Nanak Singh was publicly recognized with many awards, including Punjab's highest literary award in 1960.
• His great historical novel, Ik Mian Do Talwaran (One Sheath and Two Swords, 1959), won him India's highest literary honor, the Sahitya Akademi Award, in 1962.

Confusion PointsGurdial Singh was the second Punjabi author to be bestowed with the Jnanpith award, India's highest literary award, after poet Amrita Pritam. Gurdial Singh was the only living Punjabi writer to win Jnanpith Award.

The Asian Wrestling Championship 2024 is being held in Bishkek, Kyrgyzstan. In this championship, India's Udit won the silver medal in men's freestyle 57 kg. While Abhimanyu gave India the second medal in 70 kg.  

• Shisham is the state tree of Punjab.
• Shisham (Dalbergia sissoo) or Indian Rosewood is commonly known as Sissoo is a deciduous tree that grows in Punjab, Haryana and some other parts of India, Pakistan and Nepal.
• Dalbergia sissoo has been declared as State Tree of Punjab vide Govt. notification on 15-3-1989.
• It is primarily found growing along river banks below 900 m elevation but can range naturally up to 1300 m.
• The lofty tree grows along fertile riverbanks and can withstand extreme climatic conditions. The temperature in its native range averages 10-40 °C, but varies from just below freezing to nearly 50oC.
• It can withstand average annual rainfall up to 2000 mm and or 3-4 months of severe drought.

Infant Mortality Rate - The ratio of deaths in an area to the population of that area; expressed per 1000 per year.