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4

A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

A. -140 kJ

B. -80 kJ

C. -40 kJ

D. +60 kJ

Correct Answer :

D. +60 kJ


Related Questions

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4

The moment of resistance of a balanced reinforced concrete beam is based on the stresses in

A. Steel only

B. Concrete only

C. Steel and concrete both

D. None of these

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4

Tensile strength of a material is obtained by dividing the maximum load during the test by the

A. Area at the time of fracture

B. Original cross-sectional area

C. Average of (A) and (B)

D. Minimum area after fracture

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4

Kerosene is distilled at

A. 65° to 220°C

B. 220° to 345°C

C. 345° to 470°C

D. 470° to 550°C

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4

In a tensile test, near the elastic limit zone, the

A. Tensile strain increases more quickly

B. Tensile strain decreases more quickly

C. Tensile strain increases in proportion to the stress

D. Tensile strain decreases in proportion to the stress

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4

The increase in entropy of a system represents

A. Increase in availability of energy

B. Increase in temperature

C. Decrease in pressure

D. Degradation of energy

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4

When the expansion or compression takes place according to the law pvn = C, the process is known as

A. Isothermal process

B. Adiabatic process

C. Hyperbolic process

D. Polytropic process

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4

The percentage reduction in area of a cast iron specimen during tensile test would be of the order of

A. More than 50 %

B. 25-50 %

C. 10-25 %

D. Negligible

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4

When two plates are butt together and riveted with cover plates with two rows of rivets, the joint is known as

A. Lap joint

B. Butt joint

C. Single riveted single cover butt joint

D. Double riveted double cover butt joint

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4

For the same compression ratio, the efficiency of dual combustion cycle is

A. Greater than Diesel cycle and less than Otto cycle

B. Less than Diesel cycle and greater than Otto cycle

C. Greater than Diesel cycle

D. Less than Diesel cycle

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4

The entropy may be expressed as a function of

A. Pressure and temperature

B. Temperature and volume

C. Heat and work

D. All of these

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4

The stress at which extension of the material takes place more quickly as compared to the increase in load is called

A. Elastic point of the material

B. Plastic point of the material

C. Breaking point of the material

D. Yielding point of the material

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4

An isothermal process is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Avogadro's law

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4

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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4

Mond gas is obtained by

A. Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

B. Carbonisation of bituminous coal

C. Passing steam over incandescent coke

D. Passing air and a large amount of steam over waste coal at about 650°C

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4

When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is

A. Tensile stress

B. Compressive stress

C. Shear stress

D. Thermal stress

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4

The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

A. Workdone

B. Entropy

C. Enthalpy

D. None of these

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4

Strain is defined as the ratio of

A. Change in volume to original volume

B. Change in length to original length

C. Change in cross-sectional area to original cross-sectional area

D. Any one of the above

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4

The point of contraflexure is a point where

A. Shear force changes sign

B. Bending moment changes sign

C. Shear force is maximum

D. Bending moment is maximum

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4

Which of the following statement is wrong?

A. The deformation of the bar per unit length in the direction of the force is called linear strain.

B. The Poisson's ratio is the ratio of lateral strain to the linear strain.

C. The ratio of change in volume to the original volume is called volumetric strain.

D. The bulk modulus is the ratio of linear stress to the linear strain.

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4

When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ε₁ = Hoop strain, and ε₂ = Longitudinal strain)

A. 2ε₁ - ε₂

B. 2ε₁ + ε₂

C. 2ε₂ - ε₁

D. 2ε₂ + ε₁

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4

The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

A. Law of equipartition of energy

B. Law of conservation of energy

C. Law of degradation of energy

D. None of these

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4

A composite shaft consisting of two stepped portions having spring constants K₁ and K₂ is held between two rigid supports at the ends. Its equivalent spring constant is

A. K₁ K₂

B. (K₁ + K₂)/ 2

C. (K₁ + K₂)/ K₁ K₂

D. K₁ K₂/ (K₁ + K₂)

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4

Which of the following is the correct statement?

A. All the reversible engines have the same efficiency.

B. All the reversible and irreversible engines have the same efficiency.

C. Irreversible engines have maximum efficiency.

D. All engines are designed as reversible in order to obtain maximum efficiency.

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4

The work ratio of simple gas turbine cycle depends upon

A. Maximum cycle temperature

B. Minimum cycle temperature

C. Pressure ratio

D. All of these

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4

In an irreversible process, there is a

A. Loss of heat

B. No loss of heat

C. Gain of heat

D. No gain of heat

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4

The bending moment at a point on a beam is the algebraic ________ of all the moments on either side of the point.

A. Sum

B. Difference

C. Multiplication

D. None of the above

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4

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

A. Carnot cycle

B. Stirling cycle

C. Otto cycle

D. Diesel cycle

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4

The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be

A. 1 : 2

B. 1 : 3

C. 1 : 4

D. 1 : 2.5

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4

All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Joule's law

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4

A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.

A. Same

B. Lower

C. Higher

D. None of these