SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

Q.1 In the boiler mountings, the blow-off cock is fitted at ______.

1. the top of the boiler shell
2. near the steam supply line
3. the bottom of the boiler shell
4. the middle of the boiler shell

Correct Option: 3

Q.2 Which of the following is the advantage of axial flow pump?

1. High head
2. High volumetric discharge
3. Low volumetric discharge
4. Medium discharge pressure

Correct Option: 2

Q.3 In the context of work done of turbine, the power developed by the runner depends on which of the following parameters?

1. Blade velocity
2. Whirl velocity only
3. Whirl and blade velocities
4. Velocity at the exit of draft tube

Correct Option: 3

Q.4 Which of the following statements is correct about the forced-draught fan used in steam boilers?

1. The power required by an induced-draught fan is greater than that required by a forced-draught fan for the same amount of draught.
2. The power required by an induced-draught fan is less than that required by a forced-draught fan for the same amount of draught.
3. The power required by an induced-draught fan is equal to that required by a forced-draught fan for the same amount of draught.
4. The power required by an induced-draught fan may be greater than or less than that required by a forced-draught fan for the same amount of draught.

Correct Option: 1

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

Q.5 A cantilever beam carries a uniformly distributed load over a span of 1 m as shown in the figure below. The reactive moment at point A is _________.

1. 5 kN-m
2. 10 kN-m
3. 0 kN-m
4. 30 kN-m

Correct Option: 1

Q.6 Which of the following statements is correct about water-tube and fire-tube boilers?

1. In case of fire-tube boilers, hot gases are surrounded over the tubes.
2. In case of fire-tube boilers, water flows in the tubes.
3. In case of water-tube boilers, hot gases flow in the tubes.
4. In case of fire-tube boilers, hot gases flow in the tubes.

Correct Option: 4

Q.7 Which of the following types of simple manometers measures the gauge pressure of only incompressible fluids?

1. Single column manometer
2. Differential U-tube manometer
3. U-tube manometer
4. Piezometer

Correct Option: 4

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

Q.9 If the manometric efficiency and mechanical efficiency of a centrifugal pump are 70% and 80%, respectively, then the overall efficiency will be:

1. 40%
2. 56%
3. 75%
4. 80%

Correct Option: 2

Q.11 Which of the following is an isochoric process?

1. Heating of steam in a closed rigid vessel.
2. Heat is supplied during evaporation.
3. Heating of steam in a cylinder containing a sliding piston.
4. Heat supplied is zero.

Correct Option: 1

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

Q.12 If difference of axial components of velocity at inlet and outlet of a de-Laval turbine is found to be 120 m/s and mass flow rate of steam is 7 kg/s then axial thrust on the rotor is

1. 17.14 N
2. 7 N
3. 840 N
4. 120 N

Correct Option: 3

Q.13 The function of an air pre-heater is _____________.

1. to increase the temperature of air after entering the furnace
2. to increase the temperature of air before entering the furnace
3. to decrease the temperature of air after entering the furnace
4. to decrease the temperature of air before entering the furnace

Correct Option: 2

Q.14 According to _________, the intensity of pressure in a liquid at rest is constant in all directions.

1. Newton’s law
2. hydrostatic law
3. Boyle’s law
4. Pascal’s law

Correct Option: 4

Q.15 Which of the following statements related to rope drives is INCORRECT?

1. It has good crushing resistance.
2. Shafts do not require exact alignment.
3. Rope drives have high mechanical efficiency.
4. It is used to transmit power only for shorter distances.

Correct Option: 4

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

Q.16 Which of the following statements is correct regarding governor?

1. It controls acceleration of the prime mover.
2. It controls the temperature of the prime mover.
3. It controls the mean speed of the prime mover.
4. It is not a compulsory device of the prime mover.

Correct Option: 3

Q.17 The SI unit of specific heat is:

1. Jkg/K
2. JK/kg
3. J/kg
4. J/kg.K

Correct Option: 4

Q.18 Which of the following statements is INCORRECT about the Benson boiler?

1. The Benson boiler is heavier than other boilers.
2. The average operating pressure for the Benson boiler is higher than 200 bar.
3. Benson boilers can be switched on very quickly.
4. In Benson boilers, drums are not used.

Correct Option: 1

Q.19 Functionality of nozzle is that,________

1. It produces steam at very low velocity
2. It produces steam at very low pressure
3. It produces steam jet at very high pressure
4. It produces steam jet at very high velocity

Correct Option: 4

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

Q.20 If the pressure intensity at a point in a fluid is given as 2.7 N/cm2, then what will be the pressure head of oil of specific gravity 0.9 at that point? Take g = 10 m/s2.

1. 30 cm of oil
2. 3 m of oil
3. 3 cm of oil
4. 3 mm of oil

Correct Option: 2

Q.21 If the line of stroke of a follower passes through the centre of rotation of a cam, then the cam is called _________.

1. globoidal cam
2. oscillating cam and follower
3. offset cam
4. radial cam

Correct Option: 4

Q.22 Which of the following equations is NOT used in deriving the expression for discharge through the steam nozzle?

1. Steady flow energy equation
2. Newton’s equation of viscosity
3. Continuity equation
4. Momentum equation

Correct Option: 2

Q.23 What will be the specific weight of one litre of petrol of specific gravity 0.7? (Take g = 9.81 m/sec2)

1. 5436 N/m3
2. 6256 N/m3
3. 7286 N/m3
4. 6867 N/m3

Correct Option: 4

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

Q.24 Which of the following about work transfer is NOT correct?

1. Work is a transient phenomenon.
2. Work is given by the area under the curve on p-V diagram in case of non-flow process.
3. Work transfer is a thermodynamic property.
4. Work transfer is a boundary phenomenon.

Correct Option: 3

Q.25 If head imparted by impeller to water is equal to manometric head, then the manometric efficiency of the centrifugal pump will be:

1. 50%
2. 100%
3. 0%
4. 75%

Correct Option: 2

SSC JE 9 Oct 2023 PAPER I Mechanical Part 5

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