← MES Jr. Grade
Past Questions
Transfer of heat energy takes place in accordance with
A)
Zeroth law of thermodynamics
B)
First law of thermodynamics
C)
Second law of thermodynamics
D)
Third law of thermodynamics
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Second law of thermodynamics' (Option C).
Combustion in CI engines is
A)
Laminar
B)
Turbulent
C)
Homogeneous
D)
Heterogeneous
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Heterogeneous' (Option D).
The air standard Otto cycle comprises
A)
two constant pressure processes and two constant volume processes
B)
two constant pressure and two constant entropy processes
C)
two constant volume processes and two constant entropy processes
D)
none of the above.
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'two constant pressure and two constant entropy processes' (Option B).
The ratio of work-done per cycle to the stroke volume of the compressor is known as
A)
Compressor capacity
B)
Compression ratio
C)
Compressor efficiency
D)
Mean effective pressure
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Mean effective pressure' (Option D).
Thermal conductivity of powderly and porous materials
A)
Decreases with increasing temperature
B)
Increases with increasing temperature
C)
Is independent of temperature change
D)
None of the above
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Increases with increasing temperature' (Option B).
The phenomenon occurring in an open channel when a rapidly flowing stream abruptly changes to slowly flowing stream causing a distinct rise of liquid surface, is
A)
Water hammer
B)
Hydraulic jump
C)
Critical discharge
D)
None of the above
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Hydraulic jump' (Option B).
What is the correct formula for Euler’s equation of motion? if, q = density of the fluid, p = pressure force, g = acceleration due to gravity, v = velocity of the fluid
A)
(p / q) + (g / q) + (v / q) = 0
B)
(p / q) + (g / q) + (v dv) = 0
C)
(p / q) + (g dz) + (v dv) = 0
D)
(p dp) + (g dz) + (v dv) = 0
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '(p / q) + (g / q) + (v / q) = 0' (Option A).
Transient heat conduction means
A)
heat conduction for a short time
B)
conduction when the temperature at a point varies with time
C)
very little heat transfer
D)
heat conduction with a very small temperature difference
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'heat conduction with a very small temperature difference' (Option D).
A Carnot cycle operates between temperatures of 727°C and 227°C, the efficiency of the engine is
A)
40%
B)
50%
C)
60%
D)
45%
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is '40%' (Option A).
Gases have poor
A)
tranmissitivity
B)
absorptivity
C)
reflectivity
D)
emissivity
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'emissivity' (Option D).
Supercharging is the process of.
A)
Providing the forced cooing air
B)
Raising exhaust pressure
C)
Suppling the intake of an engine with air at a density greater than the density of the surrounding atmosphere
D)
Suppling compressed air to remove combustion product fully
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Providing the forced cooing air' (Option A).
The type of rotary compressor used in gas turbine is of
A)
Centrifugal type
B)
Axial flow type
C)
Radial flow type
D)
None of this
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'None of this' (Option D).
In fluid mechanics, the continuity equation is a mathematical statement embodying the principle of
A)
conservation of momentum
B)
conservation of mass
C)
conservation of energy
D)
none of the above
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'conservation of energy' (Option C).
A fluid does not flow
A)
in the presence of pressure
B)
in the absence of pressure
C)
in the presence of shear stress
D)
in the absence of shear stress
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'in the absence of pressure' (Option B).
In a fire-tube boiler
A)
water flows through the tubes
B)
flue gas flows through the tubes
C)
fire is produced in the tubes
D)
flue gas surrounds the tube
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'flue gas flows through the tubes' (Option B).
If the position of metacentre M remains lower than c.g. of the body, G, the body will remain in a state of
A)
stable equilibrium
B)
unstable equilibrium
C)
neutral equilibrium
D)
any of the above
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'neutral equilibrium' (Option C).
A normal shock propagated into still air travels with a speed
A)
Equal to the speed of sound in the still air
B)
Larger than the speed of sound in the still air
C)
Smaller than the speed of sound in the still air
D)
All of the above is possible, depending on the air temperature
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'All of the above is possible, depending on the air temperature' (Option D).
A Kaplan turbine is
A)
an inward flow impulse turbine
B)
low head axial flow turbine
C)
high head axial flow turbine
D)
high head mixed flow turbine
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'high head mixed flow turbine' (Option D).
When does a vapour become superheated?
A)
when the temperature of vapour is less than the saturation temperature at given pressure
B)
when the temperature of vapour is more than the saturation temperature at given pressure
C)
when the temperature of vapour is equal to the saturation temperature at given pressure
D)
none of the mentioned
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'when the temperature of vapour is equal to the saturation temperature at given pressure' (Option C).
The concept of welfare state finds elaboration in the:
A)
Directive Principles of State Policy
B)
Preamble
C)
Fundamental Rights
D)
Fundamental Duties
The concept of a welfare state is elaborated in the Directive Principles of State Policy (Part IV of the Indian Constitution). These principles direct the State to promote social and economic justice, reduce inequalities, and secure the welfare of the people, which is the essence of a welfare state. The Preamble only states the broad ideals of justice, liberty, equality, and fraternity; it does not elaborate the welfare-state concept in operational terms. Fundamental Rights mainly guarantee individual liberties and legal protections, while Fundamental Duties impose obligations on citizens, not the State. Hence, the correct option is Directive Principles of State Policy.
The serving President of FIFA is –
A)
Gianni Infantino
B)
Sepp Blatter
C)
Issa Hayatou
D)
Michel Platini
Gianni Infantino is the serving President of FIFA. He was elected in 2016 and has continued in office since then, making option (a) correct. The other options are incorrect because Sepp Blatter was a former FIFA President, Issa Hayatou served as acting FIFA President briefly, and Michel Platini was never FIFA President.
What is the last date announced by the Aviation Ministry for voluntarily registering drones?
A)
31st December, 2019
B)
31st January, 2020
C)
29th February, 2020
D)
31st March, 2020
The correct answer is **31st January, 2020**. The Aviation Ministry (through the drone registration/voluntary disclosure exercise under the drone policy framework) announced this as the last date for voluntarily registering drones. Hence, option **b** is correct.
Why the other options are incorrect:
- **a) 31st December, 2019** — this was not the announced final date.
- **c) 29th February, 2020** — no such deadline was announced for voluntary drone registration.
- **d) 31st March, 2020** — this is later than the actual deadline and therefore incorrect.
Which among the following diseases are not bacterial?
A)
Cholera and Diphtheria
B)
Malaria and trichomonasis
C)
Tetanus and typhoid
D)
Tuberculosis and leprosy
Option (b) is correct because malaria is caused by the protozoan Plasmodium and trichomoniasis is caused by the protozoan Trichomonas vaginalis; neither is a bacterial disease. The other options are incorrect because they list diseases caused by bacteria: cholera (Vibrio cholerae) and diphtheria (Corynebacterium diphtheriae) in (a), tetanus (Clostridium tetani) and typhoid (Salmonella typhi) in (c), and tuberculosis (Mycobacterium tuberculosis) and leprosy (Mycobacterium leprae) in (d).
The I-League champion (India) in 2018-19 season was –
A)
Aizawl FC
B)
Mohun Bagan FC
C)
East Bengal FC
D)
Chennai City FC
Chennai City FC won the I-League title in the 2018–19 season, so option (d) is correct. East Bengal FC and Mohun Bagan FC were strong contenders in Indian football but did not win the 2018–19 I-League, and Aizawl FC had won the league earlier (2016–17), not in 2018–19.
A substance used in the fire extinguisher under the trade name of Pyrene is:
A)
Carbon dioxide
B)
Chloroform
C)
Carbon tetrachloride
D)
Bleaching powder
Pyrene is the trade name historically used for carbon tetrachloride (CCl4), which was once used in fire extinguishers because it does not support combustion and helps smother flames. Hence, option (c) is correct. Carbon dioxide (a) is also used in fire extinguishers, but it is not Pyrene. Bleaching powder (d) is a disinfectant/oxidizing agent, not a fire-extinguishing substance. Chloroform (b) is an anesthetic solvent and is not used as Pyrene in fire extinguishers.