SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.26 Which of the following evaporators are also known as prime-surface evaporators?

1. Shell-and-tube evaporators
2. Plate evaporators
3. Finned-tube evaporators
4. Bare-tube coil evaporators

Correct Option: 4

Q.27 In which percentage generally is lubricating oil mixed with the fuel, which is then inducted into the carburettor in a mist lubricating system?

1. Zero
2. 30% to 40%
3. 40% to 50%
4. 3% to 6%

Correct Option: 4

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.28 In case of dual cycle of an IC engine, heat addition is __________.

1. only an isobaric process
2. both an isochoric and an isobaric process
3. only an isochoric process
4. anisentropic process

Correct Option: 2

Q.29 Heat addition during the constant pressure process is equal to ________.

1. change in entropy
2. specific heat
3. change in enthalpy
4. change in internal energy

Correct Option: 3

Q.30 If the cutter and workpiece movements are in opposite directions, the milling process is known as –

1. Down milling
2. Side milling
3. Up milling
4. Face milling

Correct Option: 3

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.31 An impulse turbine is running at 1000 rpm with a net head 600 m. If the discharge through the nozzle is 0.1 m3/s, then what will be the power available at the nozzle? Take g = 10 m/s2.

1. 450 kW
2. 700 kW
3. 600 Kw
4. 525 kW

Correct Option: 3

Q.32 The reversible adiabatic process in Mollier chart is represented by _________.

1. a line parallel to the saturated vapour line
2. a horizontal line
3. a line parallel to the saturated water line
4. a vertical line

Correct Option: 4

Q.33 Which of the following statements is true about hot working process?

1. Hot working process of tin is also a cold working process.
2. All hot working processes must be done above local environment temperature.
3. It is a process of working above room temperature.
4. It is a process of working above recrystallisation temperature of the materials.

Correct Option: 4

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.34 For the same temperature limit, which of the following cycles has maximum efficiency?

1. Diesel cycle
2. Otto cycle
3. Carnot cycle
4. Normal Stirling cycle

Correct Option: 3

Q.35 The process of pushing the heated billet or slug of metal through an die orifice, thus forming an elongated part of a uniform cross-section corresponding to the shape of the die orifice is known as ____________

1. Drawing process
2. Rolling process
3. Machining process
4. Extrusion process

Correct Option: 4

Q.37 Which of the following equations is used to calculate major losses in pipes?

1. Continuity equation
2. Darcy-Weisbach equation
3. Reynolds’s equation
4. Momentum equation

Correct Option: 2

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.38 What is the main function of the condenser in a Rankine cycle power plant?

1. To condense the steam till it transforms into saturated liquid
2. To increase the temperature of the cooling water
3. To increase the pressure of the steam
4. To decrease the efficiency of the cycle

Correct Option: 1

Q.39 0.2 m3 of an ideal gas at the pressure of 2 MPa and 600 K is expanded isothermally to 5 times the initial volume. It is then cooled to 300 K at constant volume and then, compressed back polytropically to its initial state. The pressure just after the constant volume process is _______.

1. 0.2 MPa
2. 2.0 Mpa
3. 0.4 MPa
4. 0.8 Mpa

Correct Option: 1

Q.40 The evaporation of feedwater at 100°C into dry and saturated steam at 100°C at atmospheric pressure is known as ____________.

1. boiler horsepower
2. actual evaporation
3. equivalent evaporation
4. boiler efficiency

Correct Option: 3

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.43 Scavenging phenomenon occurred in Two-stroke IC engine when

1. Both transfer port and exhaust port are fully closed
2. Both transfer Port and exhaust port are opened for a while simultaneously
3. Both inlet and outlet Valve are fully closed
4. Both inlet and outlet Valve are opened for a while simultaneously

Correct Option: 2

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.45 In the refrigeration system, heat rejection factor is the ratio of ___________.

1. heat rejected to the refrigeration capacity
2. load on the condenser to the COP
3. refrigeration capacity to the work done by compressor
4. work done by compressor to the refrigeration capacity

Correct Option: 1

Q.46 The point of intersection of the line of action of the resultant hydrostatic force and the submerged surface is called _____.

1. centre of pressure
2. centre of buoyancy
3. centre of mass
4. centre of gravity

Correct Option: 1

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.47 Latent heat of vaporisation is NOT the _______.

1. heat added at constant temperature of 100°C to convert water into steam
2. heat required for complete conversion of ice into water
3. heat required for complete conversion of saturated liquid into dry saturated vapour
4. sum of internal latent heat and external work of evaporation

Correct Option: 2

Q.48 Which of the following is NOT a merit of dead weight safety valve?

1. Simplicity of design
2. It is a good choice for low-pressure vessels
3. Gives satisfactory performance during operation
4. Suitable for high pressure boiler

Correct Option: 4

Q.49 In the Bell-Coleman refrigeration cycle, the temperature of the refrigerant is maximum at the:

1. end of constant pressure cooling process
2. end of isentropic compression
3. start of isentropic compression
4. end of isentropic expansion

Correct Option: 2

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

Q.50 The direction of the friction force is:

1. in the opposite direction of motion of the body or in the opposite direction of the tendency to move
2. in the inclined direction of the motion of the body
3. in the direction of motion of the body
4. in the perpendicular direction of the motion of the body

Correct Option: 1

SSC JE 9 Oct 2023 PAPER I Mechanical Part 6

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