Junior Engineer • Paper-II
Catalytic converters are called 3-way converters because they promote the reduction of
A)
CO, HC, NO
B)
H2O, O2
C)
NO, C, H2O
D)
H, C, H2O
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'NO, C, H2O' (Option C).
Junior Engineer • Paper-II
Heat transfer from higher temperature to lower temperature takes place
A)
According to First law of thermodynamics
B)
According to Second law of thermodynamics
C)
According to Zeroth law of thermodynamics
D)
According to Fourier law
Heat flows spontaneously from a higher-temperature body to a lower-temperature body according to the Second law of thermodynamics. This law states the natural direction of heat transfer and the increase of entropy in an isolated system. Fourier’s law (option d) gives the rate of heat conduction and shows heat flows in the direction of decreasing temperature gradient, but it is not the fundamental thermodynamic law asked here. The First law (option a) is only the law of energy conservation, and the Zeroth law (option c) defines thermal equilibrium and temperature, not the direction of heat flow.
Junior Engineer • Paper-II
Another name for a damper is
A)
Shock absorber
B)
Torsion bar
C)
Spring
D)
Independent suspension
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Shock absorber' (Option A).
Junior Engineer • Paper-II
As it discharges a definite quantity of fluid during the displacement of its position or plunger, a reciprocating pump is also known as a
A)
Positive displacement pump
B)
Centrifugal pump
C)
Rotary pump
D)
None of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Centrifugal pump' (Option B).
Junior Engineer • Paper-II
The differences between the power obtained from the turbine shaft and the power supplied by water at its entry to the turbine is equal to
A)
The hydraulic losses
B)
Mechanical losses
C)
Hydraulic & Mechanical losses
D)
Mechanical & Volumetric losses
The power supplied by water at the turbine entry is the hydraulic power available at the runner inlet. The power obtained from the turbine shaft is the shaft output after all internal losses. Therefore, the difference between these two powers represents the losses occurring inside the turbine due to flow/energy dissipation, i.e., hydraulic losses.
Why others are incorrect:
- b) Mechanical losses: these are the losses between runner power and shaft power (bearings, friction, etc.), not between water entry power and shaft power.
- c) Hydraulic & Mechanical losses: this would be the difference between water power at inlet and overall shaft power only if both hydraulic and mechanical losses were being grouped, but the standard term for the difference specifically between inlet water power and shaft power is not this option in this context.
- d) Mechanical & Volumetric losses: volumetric losses relate to leakage and are not the direct difference between inlet water power and shaft power.
Hence, the correct answer is a) The hydraulic losses.
Junior Engineer • Paper-II
The camshaft drive which does not require lubrication is
A)
Chain drive
B)
Gear Drive
C)
Toothed rubber belt
D)
Fan belt
The correct answer is **c) Toothed rubber belt**. A toothed rubber belt (timing belt) is a dry drive and **does not require lubrication**, because it runs without metal-to-metal contact and is designed to operate without oil or grease.
Why the others are incorrect:
- **a) Chain drive**: A chain drive needs regular lubrication to reduce wear, noise, and friction.
- **b) Gear drive**: Gears also require lubrication to prevent wear and overheating.
- **d) Fan belt**: A fan belt is a friction belt and does not need lubrication, but in camshaft drive applications the standard maintenance-free drive referred to is the **toothed rubber timing belt**. The question specifically asks for the camshaft drive that does not require lubrication.
Junior Engineer • Paper-II
Which comes next in the sequence? AB CD CD AB DA BC BC DA CD AB
A)
DA BC
B)
AB DC
C)
AB CD
D)
DA CB
Based on established principles in Reasoning & Mental Ability, the correct and most appropriate choice is 'DA CB' (Option D).
Junior Engineer • Paper-II
Which one of the following is not a characteristics of management of engineering system?
A)
It should be innovative
B)
It should be far sighted
C)
It should be rigid
D)
It should not be too quick
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'It should be innovative' (Option A).
Junior Engineer • Paper-II
Turbine compressor used to compress incoming air into the engine in CI engine is
A)
Super charger
B)
Throttle
C)
Turbo charger
D)
Starter
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Super charger' (Option A).
Junior Engineer • Paper-II
In order to have a high efficiency, the centrifugal pumps are generally provided with impeller having their blades bent
A)
Inwards
B)
Backwards
C)
Forwards
D)
All of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'All of these' (Option D).
Junior Engineer • Paper-II
The flow in which the volume and the density of the following fluid does not change during the flow is called
A)
Compressible flow
B)
Turbulent flow
C)
Non-uniform flow
D)
Incompressible flow
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Turbulent flow' (Option B).
Junior Engineer • Paper-II
The four main components of costs are- (i)prime cost (ii) office cost (iii) total cost and
A)
Work Cost
B)
Estimate cost
C)
Advanced cost
D)
Material cost
Based on established principles in Indian Economy, the correct and most appropriate choice is 'Advanced cost' (Option C).
Junior Engineer • Paper-II
Co-efficient of Performance (COP) of domestic air conditioner as compared to that of domestic refrigerator will be
A)
Lower
B)
Higher
C)
Same
D)
Unpredictable
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Same' (Option C).
Junior Engineer • Paper-II
The specific heat of a gas at constant pressure and a constant volume is
A)
Always constant
B)
Always varies with pressure
C)
Always varies with temperature
D)
Always constant with temperature
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Always constant' (Option A).
Junior Engineer • Paper-II
Minimum volume in the combustion chamber with piston at TDC is called
A)
Displacement
B)
Stroke
C)
Bore
D)
Clearance Volume
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Stroke' (Option B).
Junior Engineer • Paper-II
Camshaft in an engine is always mounted
A)
Parallel to the crankshaft
B)
Perpendicular to the crankshaft
C)
Inclined to the crankshaft
D)
None of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'None of these' (Option D).
Junior Engineer • Paper-II
The materials directly contributed to a product and those easily identifiable in the finished product are called
A)
Direct product
B)
Direct goods
C)
Direct materials
D)
Direct cost materials
The correct answer is **Direct materials**. These are the materials that become an integral part of the finished product and can be directly traced or identified in it, such as wood in furniture or steel in a machine.
Why the others are incorrect:
- **d. Direct cost materials**: This is not the standard term used in cost accounting.
- **b. Direct goods**: Not a recognized cost accounting classification.
- **a. Direct product**: Also not a valid term for materials used in production.
Therefore, the correct option is **c. Direct materials**.
Junior Engineer • Paper-II
Hydraulic efficiency of the turbine is the ratio of
A)
Power developed by the runner / Net power supplied at the turbine entrance
B)
Net power supplied at the turbine entrance / Power developed by the runner
C)
2 X Net power supplied at the turbine entrance / Net power generated
D)
All of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'All of these' (Option D).
Junior Engineer • Paper-II
Increase of torque in a vehicle is obtained by
A)
Decreasing speed
B)
Decreasing power
C)
Decreasing fuel consumption
D)
All of the above
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'All of the above' (Option D).
Junior Engineer • Paper-II
Ammonia is used with
A)
Reciprocating refrigerant compressors
B)
Centrifugal refrigerant compressors
C)
Axial flow refrigerant compressors
D)
All of these
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'All of these' (Option D).
Junior Engineer • Paper-II
The speed of a turbine in which the maximum speed is attained by the runner under maximum head at full gate opening, when the external load (i.e. generator) is disconnected from the system and the governor ceased to function is called
A)
Maximum speed
B)
Maximum velocity
C)
Runaway speed
D)
Variable speed
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Runaway speed' (Option C).
Junior Engineer • Paper-II
The hydrocarbons having the best anti-knock qualities are
A)
Paraffins
B)
Olefins
C)
Napthalenes
D)
Aromatics
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Olefins' (Option B).
Junior Engineer • Paper-II
Heat is rejected by the refrigerant during vapour compression refrigeration cycle in
A)
Condenser
B)
Evaporator
C)
Throttle Valve
D)
Compressor
Based on established principles in Mechanical Engineering, the correct and most appropriate choice is 'Condenser' (Option A).
Junior Engineer • Paper-II
A centrifugal fan forms
A)
Closed system
B)
Open system
C)
Isolated system
D)
Circuited system
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Circuited system' (Option D).
Junior Engineer • Paper-II
Machining is a process designed to remove unwanted material from a workpiece in the form of
A)
Continuous chips
B)
Discontinuous chips
C)
Granular
D)
Both (a) & (b)
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Both (a) & (b)' (Option D).
