RCFL MT Mechanical Mock Test - 4 - Mechanical Engineering MCQ

Let VS = Stroke volume

VC = Clearance volume

Compression Ratio (rc) = EffectiveSweptVolume/ClearanceVolume

Effects of sensible heating:

i) Dry bulb temperature increases

ii) Sp. Humidity or humidity ratio remains constant

iii) Dew point temperature is constant

iv) Relative humidity decreases

v) Enthalpy increases

vi) Specific Volume Increases

vii) Wet bulb temperature increases

Where ∂P/∂x = pressure gradient along the length of the plate

y = point of consideration from the lower fixed plate

t = distance between the two fixed parallel plates

Velocity distribution and Shear stress distribution

Mercury has a very low vapour pressure when compared to that of water. So, it is more sensitive than water to the changes in the atmospheric pressure and rises more quickly to record the changes in the atmospheric pressure.

Physical Properties of Refrigerants

Low Condensing Pressure.
High Evaporator Pressure.
High Critical Pressure.
High Vapor Density.
High Dielectric strength.
High Latent Heat of Vaporization.
High Heat Transfer Coefficient.

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.

Q_{supplied = 60KJ}

_{du= -30 KJ}

_{from first law of thermo=}

_{dQ = du + dW}

_{60 = -30 + dW}

_{dW = 90 KJ}

As radiation is the mode of heat transfer in which heat is radiated or transmitted from one place to another in the form of rays or waves. It does not require any material medium. It takes place by electromagnetic radiation.

Venturi meter

Venturi meter is a device used to measure the flow rate of a fluid flowing through a pipe. Venturi meter is divided into 3 parts: convergent cone, divergent cone, and throat.

The long length of the divergent section is kept three to four times the convergent length to avoid any possibility of flow separation and to minimize frictional losses occurring in a flow.

Streamlines

Streamlines are the lines drawn through the flow field in such a manner that the velocity vector of the fluid at each and every point on the streamline is tangent to the streamline at that instant.

For 1D Flow, it is a line, and for 2D flow, it is represented by a curve. The equation of streamline is given by:

udy − vdx = 0

Bernoulli’s Equation

Bernoulli’s Equation is known as the conservation of energy principle. It states that in a steady, ideal flow of an incompressible fluid, the total energy at any point of the fluid is constant. The total energy consists of pressure energy, kinetic energy, and potential energy or datum energy.

Pitot Tube

Pitot Tube is a device used for measuring the velocity of flow at any point in a pipe or a channel.

It is based on the principle that if the velocity of flow at a point becomes zero, the pressure there is increased due to the conversion of the kinetic energy into pressure energy.

Pipes in series: Pipes in series or compound pipes are defined as the pipes of different lengths and different diameters connected end to end (in series) to form a pipeline.

• Discharge through each pipe is the same.
• The total loss of energy or head loss will be the sum of the losses in each pipe.

Pipes in parallel: If the main pipe divides into two or more branches and again joins together downstream to form a single pipe, then the branched pipes are said to be connected in parallel (compound pipes).

• The rate of flow in the main pipe is equal to the sum of the rate of flow through branch pipes.
• The loss of head for each branch pipe is the same

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).

(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.

obsolete : no longer in use

One word substitution is Linguist.

Linguist: a person skilled in foreign languages.
Grammarian: a person who studies and writes about grammar.
Polyglot: knowing or using several languages.
Bilingual: speaking two languages fluently.

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

Let C.P. of each article be Re. 1 C.P. of x articles = Rs. x.
S.P. of x articles = Rs. 20.
Profit = Rs. (20 - x).
20 - x x 100 = 25
x
2000 - 100x = 25x
125x = 2000
x = 16.

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

1st term = 1
2nd term = 1 + 5 = 6
3rd term = 6 + (5+4) = 6 + 9 = 15
4th term = 15 + (9+4) = 15 + 13 = 28
5th term = 28 + (13+4) = 28 + 17 = 45
6th term = 45 + (17+4) = 45 + 21 = 66
7th term = 66 + (21+4) = 66 + 25 = 91

Thus, the missing number is 4th term= 15 + (9+4) = 15+13 = 28

Second is the process of gradual disappearances of the first.

These are all defensive games.

Trapezoid, Rhombus, and Parallelogram are the 2 dimensional figure.

While;

Prism is a 3-dimensional figure.

Hence, "Prism" is the correct answer.

Important Points

The correct order of the ranks in the Indian Defence Forces in ascending order is:

4. Lieutenant

3. Colonel

2. Brigadier

1. Lieutenant General

5. Field Marshal

Hence, the correct answer is 4, 3, 2, 1, 5.

Additional Information 

The top three ranks of the Indian Defence forces are as follows : 

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.

The Correct Answer is Chandulal Madhavlal Trivedi.

Key Points

• Sir Chandulal Madhavlal Trivedi was an Indian administrator and civil servant who served as the first Indian governor of the state of Punjab (then East Punjab) after Independence in 1947.
• He subsequently served as the first Governor of Andhra Pradesh from its creation in 1953 until 1957.
• Born- 2 July 1893
• Died- 15 March 1980
• The Governor is appointed by the president for a term of 5 years.
• Power and functions of Governor:-
  • Executive Power related to administration, appointments, and removals.
  • Legislative powers related to lawmaking and the state legislature, that is Vidhan Sabha or Vidhan Parishad.
  • Discretionary powers to be carried out according to the discretion of the Governor.

Additional Information

Chakravarthi Rajagopalachari:-

• Chakravarthi Rajagopalachari was the first Governor of West Bengal.
• Tenure:- 15 August 1947 to 21 June 1948
• Current Governor Of West Bengal:- Jagdeep Dhankhar

Maharaj Man Singh II ( Rajpramukh):-

• Maharaj Man Singh II ( Rajpramukh) was the first Governor of Rajasthan.
• Tenure:- 30 March 1949 to 31 October 1956
• Current Governor of Rajasthan:- Kalraj Mishra

Dharma Vira:-

• Dharma Vira was the first Governor of Haryana.
• Tenure:- 1 November 1966 to 14 September 1967
• Current Governor of Haryana:- Satyadev Narayan Arya