Which of the following cycles is not a reversible cycle?

Question

Which of the following cycles is not a reversible cycle?

A. Carnot

B. Ericsson

C. Stirling

D. None of the above

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A key is subjected to side pressure as well at shearing forces. These pressures are called

A. Bearing stresses

B. Fatigue stresses

C. Crushing stresses

D. Resultant stresses

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Which of the following process can be made reversible with the help of a regenerator?

A. Constant pressure process

B. Constant volume process

C. Constant pvn process

D. All of these

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One kg of carbon monoxide requires _______kg of oxygen to produce 11/7 kg of carbon dioxide gas.

A. 11/7

B. 9/7

C. 4/7

D. All of the above

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Workdone in a free expansion process is

A. Zero

B. Minimum

C. Maximum

D. Positive

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Stirling cycle consists of

A. Two constant volume and two isentropic processes

B. Two constant volume and two isothermal processes

C. Two constant pressure and two isothermal processes

D. One constant volume, one constant pressure and two isentropic processes

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A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m, and then the hoop stress will be

A. 30 MN/m²

B. 50 MN/m²

C. 100 MN/m²

D. 200 MN/m²

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The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by

A. E = 3K.C/(3K + C)

B. E = 6K.C/(3K + C)

C. E = 9K.C/(3K + C)

D. E = 12K.C/(3K + C)

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Stirling and Ericsson cycles are

A. Reversible cycles

B. Irreversible cycles

C. Semi-reversible cycles

D. Adiabatic irreversible cycles

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The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)

A. R_u × T

B. 1.5 R_u × T

C. 2 R_u × T

D. 3 R_u × T

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The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is

A. L = l/2

B. L = l/√2

C. L = l

D. L = 2l

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Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A. Combustion is at constant volume

B. Expansion and compression are isentropic

C. Maximum temperature is higher

D. Heat rejection is lower

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A shaft revolving at ω rad/s transmits torque (T) in Nm. The power developed is

A. T.ω watts

B. 2π. T.ω watts

C. 2π. T.ω/75 watts

D. 2π. T.ω/4500 watts

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Which of the following has the minimum atomic mass?

A. Oxygen

B. Sulphur

C. Nitrogen

D. Carbon

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A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be

A. Tensile

B. Compressive

C. Shear

D. Zero

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When a bar is cooled to - 5°C, it will develop

A. No stress

B. Shear stress

C. Tensile stress

D. Compressive stress

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For a simply supported beam of length l, when a concentrated load W is applied in the centre of the beam, the maximum deflection is

A. 5WL³/ 384EI

B. WL³/384EI

C. WL³/ 348EI

D. WL³/ 48EI

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In an extensive property of a thermodynamic system

A. Extensive heat is transferred

B. Extensive work is done

C. Extensive energy is utilised

D. None of these

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When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the minimum normal stress is

A. (σ_x/2) + (1/2) × √(σ_x² + 4 τ²_xy)

B. (σ_x/2) - (1/2) × √(σ_x² + 4 τ²_xy)

C. (σ_x/2) + (1/2) × √(σ_x² - 4 τ²_xy)

D. (1/2) × √(σx² + 4 τ²_xy)

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Strain re-setters are used to

A. Measure shear strain

B. Measure linear strain

C. Measure volumetric strain

D. Relieve strain

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High air-fuel ratio in gas turbines

A. Increases power output

B. Improves thermal efficiency

C. Reduces exhaust temperature

D. Do not damage turbine blades

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A material obeys hooks law up to

A. Plastic limit

B. Elastic limit

C. Yield point

D. Limit of proportionality

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If the radius of wire stretched by a load is doubled, then its Youngs modulus will be

A. Doubled

B. Halved

C. Becomes four times

D. None of the above

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The heat energy stored in the gas and used for raising the temperature of the gas is known as

A. External energy

B. Internal energy

C. Kinetic energy

D. Molecular energy

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The mass of carbon per kg of flue gas is given by

A. (11/3) CO₂ + (3/7) CO

B. (3/7) CO₂ + (11/3) CO

C. (7/3) CO₂ + (3/11) CO

D. (3/11) CO₂ + (7/3) CO

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If a part is constrained to move and heated, it will develop

A. Principal stress

B. Tensile stress

C. Compressive stress

D. Shear stress

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In the below figure, the stress corresponding to point D is

A. Yield point stress

B. Breaking stress

C. Ultimate stress

D. Elastic limit

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In S. I. units, the value of the universal gas constant is

A. 8.314 J/kg mole-K

B. 83.14 J/kgmole-K

C. 831.4 J/kgmole-K

D. 8314 J/kgmole-K

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The atomic mass of sulphur is

A. 12

B. 14

C. 16

D. 32

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If the slenderness ratio for a column is 100, then it is said to be a _________ column.

A. Long

B. Medium

C. Short

D. None of these

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One kilowatt is equal to

A. 1 N-m/s

B. 100 N-m

C. 1000 N-m/s

D. 1 × 10⁶ N-m/s

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Accepted Answer

D. None of the above

Which of the following cycles is not a reversible cycle?

Correct Answer :

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