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4

Stirling and Ericsson cycles are

A. Reversible cycles

B. Irreversible cycles

C. Semi-reversible cycles

D. Adiabatic irreversible cycles

Correct Answer :

A. Reversible cycles


Related Questions

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4

An open cycle gas turbine works on

A. Carnot cycle

B. Otto cycle

C. Joule's cycle

D. Stirling cycle

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4

When a gas is heated, change takes place in

A. Pressure

B. Volume

C. Temperature

D. All of these

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4

The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. All of these

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4

A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown in the below figure. The shear force at B is equal to

A. wl/6

B. wl/3

C. wl

D. 2wl/3

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4

Diesel cycle consists of __________ processes.

A. Two constant volume and two isentropic

B. Two constant pressure and two isentropic

C. Two constant volume and two isothermal

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

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4

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.

A. Atomisation

B. Carbonisation

C. Combustion

D. None of these

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4

The bending equation is

A. M/I = σ/y = E/R

B. T/J = τ/R = Cθ/l

C. M/R = T/J = Cθ/l

D. T/l= τ/J = R/Cθ

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4

The efficiency of Diesel cycle increases with

A. Decrease in cut-off

B. Increase in cut-off

C. Constant cut-off

D. None of these

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4

When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

A. Top layer

B. Bottom layer

C. Neutral axis

D. Every cross-section

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4

A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called

A. Isothermal process

B. Hyperbolic process

C. Adiabatic process

D. Polytropic process

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4

In open cycle gas turbine plants

A. The indirect heat exchanger and cooler is avoided

B. Direct combustion system is used

C. A condenser is used

D. All of the above

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4

Which of the following is correct?

A. Absolute pressure = Gauge pressure + Atmospheric pressure

B. Gauge pressure = Absolute pressure + Atmospheric pressure

C. Atmospheric pressure = Absolute pressure + Gauge pressure

D. Absolute pressure = Gauge pressure - Atmospheric pressure

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4

For the same maximum pressure and temperature,

A. Otto cycle is more efficient than Diesel cycle

B. Diesel cycle is more efficient than Otto cycle

C. Dual cycle is more efficient than Otto and Diesel cycles

D. Dual cycle is less efficient than Otto and Diesel cycles

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4

Kelvin-Planck's law deals with

A. Conservation of work

B. Conservation of heat

C. Conversion of heat into work

D. Conversion of work into heat

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4

The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)

A. pv = mRT

B. pv = RTm

C. pvm = C

D. pv = (RT)m

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4

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be

A. 400 MPa

B. 500 MPa

C. 900 MPa

D. 1400 MPa

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4

The limit of eccentricity for no tensile conditions for a column of circular section of diameter (D) is

A. d/4

B. d/8

C. d/12

D. d/16

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4

The universal gas constant (or molar constant) of a gas is the product of

A. Molecular mass of the gas and the gas constant

B. Atomic mass of the gas and the gas constant

C. Molecular mass of the gas and the specific heat at constant pressure

D. Molecular mass of the gas and the specific heat at constant volume

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4

The property of a material by virtue of which a body returns to its original, shape after removal of the load is called

A. Plasticity

B. Elasticity

C. Ductility

D. Malleability

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4

The polytropic index (n) is given by

A. log (p1p2)/log (v1v2)

B. log (p2/ p1)/log (v1/ v2)

C. log (v1/ v2)/ log (p1/p2)

D. log [(p1v1)/(p2v2)]

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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

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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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 heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

A. Kelvin

B. Joule

C. Clausis

D. Gay-Lussac

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4

Impact strength of a material is an index of its

A. Toughness

B. Tensile strength

C. Capability of being cold worked

D. Hardness

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4

If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then

A. The material A is more ductile than material B

B. The material B is more ductile than material A

C. The ductility of material A and B is equal

D. The material A is brittle and material B is ductile

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4

The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

A. 0.086

B. 1.086

C. 1.086

D. 4.086

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4

The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as

A. Dual combustion cycle

B. Diesel cycle

C. Atkinson cycle

D. Rankine cycle

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4

A pressure vessel is said to be a thick shell, when

A. It is made of thick sheets

B. The internal pressure is very high

C. The ratio of wall thickness of the vessel to its diameter is less than 1/10.

D. The ratio of wall thickness of the vessel to its diameter is greater than 1/10.

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4

For same compression ratio and for same heat added

A. Otto cycle is more efficient than Diesel cycle

B. Diesel cycle is more efficient than Otto cycle

C. Efficiency depends on other factors

D. Both Otto and Diesel cycles are equally efficient