SSC JE General Engineering Mock Test in Hindi, SSC Online Test

Toughness is the ability of material to provide the structural strength needed to resist impacts and cutting forces.

Machinability can be tentatively defined as ‘ability of being machined’ and more reasonably as ‘ease of machining

Wear resistance is the resistance against wear. Wear is related to interactions between surfaces and specifically the removal and deformation of material on a surface as a result of mechanical action of the opposite surface.

Red hardness is the ability of material, upon heating to red heat, to retain the great hardness and durability obtained through heat treatment.
So option B is correct.

Temporarily hard water is hard because of the presence of carbonate or bicarbonate ions of calcium and/or magnesium. It can be softened by boiling or adding lime to it in a process called Lime softening. It can also be softened by ion exchange method also known as Zeolite softening.

Specific speed is defined as the speed of a turbine which is identical in shape, geometrical dimensions, blade angles, gate opening etc. with the actual turbine but of such a size that it will develop unit power when working under unit head. This is used to compare the different types of turbines as every type of turbine has different specific speed.

Following are the range of specific speed of different turbines

Pelton (Impulse Turbine)- 9-30

Francis- 51-225

Kaplan or Propeller turbine- 255-860
So option C is correct as Impulse turbine has lowest specific speed.

The Morse test is a test conducted to determine the power developed in each cylinder in a multi-cylinder IC engine. In this test first of all the power developed by all the cylinders together is determined experimentally. Then the power of the individual cylinders are determined by cutting off the power supply to the spark plug of the cylinder under test. Then the power developed by the engine with the remaining cylinders is determined experimentally and this value is subtracted from the first value and this gives you the power developed in the cylinder, whose spark plug was cut off. Similarly this test is carried out on all the cylinders of the engine individually.

Acceleration vs. time graphs tell us about an object’s velocity in the same way that velocity vs. time graphs tell us about an object’s displacement. The change in velocity in a given time interval is equal to the area under the graph during that same time interval.

Straight beams:

• Bending stress distribution is linear in bending of straight beams.
• The neutral axis coincides with geometrical axis during bending of straight beams
• Stress and strains induced in a fiber, are same in magnitude when subjected to bending moment.

Curved beams:

• Bending stress distribution is non-linear and hyperbolic in bending of curved beams.
• The neutral axis does not coincide with the centroidal axis during bending of straight beams.
• The neutral axis shifts towards the centre of curvature.
• The length of inside fiber in a curved bream is shorter than outside fibers. Hence, the stress and strain induced in inside fibers is greater than outside fibers.

In TIG welding arc is established between a non‐consumable tungsten electrode and the workpiece. In TIG welding arc length is constant, arc is stable and easy to maintain. It can be done with or without filler.

et heat taken from source = Q1
Heat rejected to sink = Q2
Work done by engine = W = 100 kW
We know

A refrigerator and heat pump both works on the Clausius’ statement of second law of thermodynamics.

Clausius’ statement of second law states that
“It is impossible to transfer heat in a cyclic process from low temperature to high temperature without work from external source”.

A kinematic chain is a group of links either joined together or arranged in a manner that permits them to move relative to one another. If the links are connected in such a way that no motion is possible, it results in a locked chain or structure. A minimum number of three links is required to form a closed chain but there will be no relative motion between these three links. Hence it cannot form a kinematic chain. So minimum of four links are necessary to form a kinematic chain.

A venture-meter is a device used for measuring the rate of a flow of a fluid flowing through a pipe. It works on the Venturi effect which states that there is reduction in fluid pressure when a fluid flows through a constricted section (or choke) of a pipe.

Orifice-meter is also used to measure the flow rate of fluid. It works on the principle that reduction of cross-section of the flowing stream in passing through orifice increases the velocity head at the expense of pressure head. Only difference in Venturi and Orifice is that area reduction is gradual in venture and its sudden in orifice.
Flow Nozzle is a device used to measure the flow rate of fluids in a pipe or conduit. A flow nozzle consists of a cone-shaped passage that creates a partial blockage of the conduit, and flow rate is determined by measuring the fluid pressure before and after the flow nozzle.

Octane number of Iso-Octane is 100. Octane number is the measure of the resistance of gasoline/petrol against detonation/knocking or pre-ignition of the fuel in the engine. It is measured relative to the mixture of Iso-octane and n-heptane. In this mixture, Iso-octane has an Octane number of 100 and n-heptane has zero octane number. Higher octane fuel has a greater resistance to auto-ignition under higher combustion pressure and heat.

A slider-crank is a kinematic chain having four links. It has one sliding pair and three turning pairs. Link 2 has rotary motion and is called crank. Link 3 has got combined rotary and reciprocating motion and is called connecting rod. Link 4 has reciprocating motion and is called slider. Link 1 is frame (fixed). This mechanism is used to convert rotary motion to reciprocating and vice versa.

Inversions of slider crank mechanism is obtained by fixing links 1, 2, 3 and 4.

First inversion: This inversion is obtained when link 1 (ground body) is fixed. Application- Reciprocating engine, reciprocating compressor etc.

Second inversion: This inversion is obtained when link 2 (crank) is fixed. Application- Whitworth quick returns mechanism, Rotary engine, etc.

Third inversion: This inversion is obtained when link 3 (connecting rod) is fixed. Application – Slotted crank mechanism, Oscillatory engine etc.

Fourth inversion: This inversion is obtained when link 4 (slider) is fixed. Application- Hand pump, pendulum pump or Bull engine, etc.

Closed cycle gas turbine works on Joule cycle. Whereas Rankine cycle is used for steam power plants. Otto cycle and Atkinson cycles are used in Internal combustion engines.

Carbides, which are nonferrous alloys, are also called, sintered (or cemented) carbides because they are manufactured by powder metallurgy techniques. Most carbide tools in use today are either straight Tungsten carbide (WC). Cobalt is the binder in the cemented carbide tools.

In an adiabatic process there is no heat transfer to or from the system through the boundary.

Spark ignition engine – Otto cycle

Compression engine – Diesel cycle

In Shell moulding, the sand is mixed with a thermosetting resin is allowed to come in contact with a heated metal pattern (2000^oC). A skin (shell) of about 3.5 mm of sand and plastic mixture adhere to the pattern. Then the shell is removed from the pattern. This is used in casting of Cylinders and cylinder heads for air‐ cooled IC engines, automobile transmission parts,piston rings etc.

Injection moulding is a manufacturing process for producing parts by injecting material into a mould. Injection moulding is used to create many things such as wire spools, packaging, bottle caps, chairs and small tables, storage containers and most other plastic products available today.

Plaster mold casting is a metalworking casting process similar to sand casting except the molding material is plaster of Paris instead of sand.

So correct option is D.

Stagnation point is the point when a moving fluid is brought to rest. A pitot tube is a pressure measurement instrument used to measure fluid flow velocity. This works on the principle that when a fluid is brought to rest then the velocity head is converted to pressure head. By the use of this pressure head one can find the flow velocity.

Refrigeration is defined as the removing of heat from a low temperature body and transferring to a high temperature body with the help of some external work.
Whereas the heat engine takes heat from a high temperature source and rejects to low temperature body with the work output.