## SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.26 In a steam boiler, an economiser is used for heating of ________.

1. fuel

2. air

3. flue gases

4. feedwater

Correct Option: 4

Q.27 Generation of steam in a boiler is an example of an _________.

1. isochoric process

2. adiabatic process

3. isobaric process

4. isothermal process

Correct Option: 3

Q.28 Find the enthalpy of 1 kg of dry and saturated steam at 10 bar if sensible heat at 10 bar is 762.8 kJ/kg and latent heat of evaporation at 10 bar is 2015.3 kJ/kg.

1. 2015.3 kJ

2. 2778.1 kJ

3. 1252.5 kJ

4. 762.8 kJ

Correct Option: 2

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.29 What is the hydraulic radius for a circular pipe running full?

1. 0.25d

2. d

3. 0.5d

4. 0.75d

Correct Option: 1

Q.30 According to the American Society of Mechanical Engineers (ASME), the evaporation of 15.63 kg of water at 100°C per hour from 100°C feedwater in a steam boiler is known as __________.

1. boiler efficiency

2. boiler horsepower

3. equivalent evaporation

4. actual evaporation

Correct Option: 2

Q.31 The term ρV2/2 used in Bernoulli theorem is basically:

1. dynamic pressure

2. stagnation pressure

3. hydrostatic pressure

4. static pressure

Correct Option: 1

Q.32 For internal laminar flow, the variation of shear stress in the radial direction is:

1. hyperbolic

2. exponential

3. linear

4. parabolic

Correct Option: 3

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.33 The pressure at the inlet of a refrigerant compressor is called _________.

1. suction pressure

2. critical pressure

3. back pressure

4. discharge pressure

Correct Option: 1

Q.35 An air standard diesel cycle working with a compression ratio of 13 and cut off takes places at 5 % of the stroke volume. The value of cut off ratio will be

1. 1.3

2. 1.9

3. 2.3

4. 1.6

Correct Option: 4

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.36 Which of the following statements is correct for compressibility?

1. Compressibility is square root of bulk modulus

2. Compressibility is equal to bulk modulus

3. Compressibility is reciprocal of bulk modulus

4. Compressibility is square of bulk modulus

Correct Option: 3

Q.37 The position of centre of pressure depends on which of the following?

1. Surface tension of fluid

2. Weight of the object immersed in liquid

3. Velocity of liquid

4. Location of object from the free surface

Correct Option: 4

Q.38 Which of the following machining operations is NOT related to turning?

1. Facing

2. Shaping

3. Boring

4. External threading

Correct Option: 2

Q.39 An oil of specific gravity 0.8 is flowing through a pipe. A differential manometer is connected at the two points, say A and B, and shows a difference in the mercury level as 20 cm. What will be the difference between the pressures at the two points?Take density of mercury = 13600 kg/m3 and g = 10 m/s2 .

1. 25.6 kN/m2

2. 25.6 N/m2

3. 1280 kN/m2

4. 2560 N/m2

Correct Option: 1

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.40 Which of the following does NOT describe the Diesel cycle?

1. Constant volume heat addition

2. No spark plug needed

3. Limited maximum temperature

4. High compression ratio

Correct Option: 1

Q.41 Select the correct statement of Lami’s theorem.

1. If three forces acting on a body are said to be in equilibrium, then each force is directly dependent on sine of the angle between the other two forces.

2. If three forces are non-coplanar, then each force is directly dependent on sine of the angle between the other two forces.

3. If two forces are in equilibrium, then each force is directly proportional to sine of the angle between them.

4. If three forces are not in equilibrium, then each force is inversely proportional to sine of the angle between the other two forces.

Correct Option: 1

Q.42 Which of the following is NOT a type of wet sump lubrication system?

1. Pressure lubrication system

2. Mist lubricating system

3. Splash lubrication system

4. Pump lubrication system

Correct Option: 2

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.43 Which of the following statements is INCORRECT?

1. The value of dryness fraction is greater than 1 for superheated steam condition.

2. The value of dryness fraction is 1 for saturated steam condition.

3. The value of dryness fraction always lies between 0 and 1.

4. The value of dryness fraction is 0 for saturated water condition.

Correct Option: 1

Q.44 Which of the following statements is true for a throttling process?

1. It is an isentropic process.

2. It is a reversible process.

3. It is a constant enthalpy process.

4. It is an isothermal process.

Correct Option: 3

Q.45 The frictional resistance in a turbulent flow is independent of the __________.

1. velocity of fluid

2. pressure

3. density of fluid

4. surface roughness

Correct Option: 2

Q.46 A cyclic heat engine of thermal efficiency 80% does 60 kJ of work per cycle. The heat rejected per cycle will be equal to __________.

1. 75 kJ

2. 48 kJ

3. 20 kJ

4. 15 kJ

Correct Option: 4

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.48 What will be the mass density of one litre of a fluid which weighs 9.81 N? (Take g = 9.81 m/sec2)

1. 1000 kg/m3

2. 100 kg/m3

3. 1000 gm/cm3

4. 100 gm/cm3

Correct Option: 1

Q.49 When any gas is heated at constant pressure, its change in volume varies directly with change in absolute temperature. This law is known as ________.

1. Charles’ law

2. Boyle’s law

3. Avogadro’s law

4. Joule’s law

Correct Option: 1

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

Q.50 Which of following losses fall into the category of major losses?

1. Head loss due to sudden enlargement

2. Head loss due to bend of pipe

3. Head loss due to sudden contraction

4. Head loss due to friction

Correct Option: 4

SSC JE 11 Oct 2023 PAPER I Mechanical Part 6

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