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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

Correct Answer :

D. All of the above


Related Questions

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When the gas is heated at constant volume, the heat supplied

A. Increases the internal energy of the gas and increases the temperature of the gas

B. Does some external work during expansion

C. Both (A) and (B)

D. None of these

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The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is

A. Equal to one

B. Less than one

C. Greater than one

D. None of these

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If Kh is the torque resisting capacity of a hollow shaft and Ks is that of a solid shaft, of the same material, length and weight. Then,

A. Kh > Ks

B. Kh < Ks

C. Kh = Ks

D. None of these

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4

Proof resilience per material is known as

A. Resilience

B. Proof resilience

C. Modulus of resilience

D. Toughness

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For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

A. Dual cycle, Diesel cycle, Otto cycle

B. Otto cycle, Diesel cycle, Dual cycle

C. Dual cycle, Otto cycle, Diesel cycle

D. Diesel cycle, Otto cycle, Dual cycle

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The state of a substance whose evaporation from its liquid state is complete, is known as

A. Vapour

B. Perfect gas

C. Air

D. Steam

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The value of modulus of elasticity for mild steel is of the order of

A. 2.1 × 10⁵ kg/cm²

B. 2.1 × 10⁶ kg/cm²

C. 2.1 × 10⁷ kg/cm²

D. 0.1 × 10⁶ kg/cm²

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The ratio of molar specific heats for mono-atomic gas is

A. 1

B. 1.4

C. 1.67

D. 1.87

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According to Kelvin-Planck's statement of second law of thermodynamics,

A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

B. It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

C. It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body

D. None of the above

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The oxygen atom is ________ times heavier than the hydrogen atom.

A. 2

B. 8

C. 16

D. 32

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When both ends of a column are fixed, the effective length is

A. Its own length

B. Twice its length

C. Half its length

D. 1/√2 × its length

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If a material expands freely due to heating it will develop

A. Thermal stresses

B. Tensile stress

C. Bending

D. No stress

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In a steady flow process, the ratio of

A. Heat transfer is constant

B. Work transfer is constant

C. Mass flow at inlet and outlet is same

D. All of these

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The change in the unit volume of a material under tension with increase in its Poisson's ratio will

A. Increase

B. Decrease

C. Remain same

D. Increase initially and then decrease

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The ultimate tensile stress of mild steel compared to ultimate compressive stress is

A. Same

B. More

C. Less

D. Unpredictable

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The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

A. Increase

B. Decrease

C. Remain unchanged

D. Increase/decrease depending on application

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When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called

A. Wood charcoal

B. Bituminous coal

C. Briquetted coal

D. None of these

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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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Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m.

A. The shaft 'B' has the greater diameter

B. The shaft 'A' has the greater diameter

C. Both are of same diameter

D. None of these

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4

A concentrated load is one which

A. Acts at a point on a beam

B. Spreads non-uniformly over the whole length of a beam

C. Spreads uniformly over the whole length of a beam

D. Varies uniformly over the whole length of a beam

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In the below figure, curve D represents_________.

A. Mild steel

B. Cast iron

C. Concrete

D. Bone of these

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Workdone in a free expansion process is

A. Zero

B. Minimum

C. Maximum

D. Positive

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True stress strain-curve for materials is plotted between

A. Load/original cross-sectional area and change in length/original length

B. Load/ instantaneous cross-sectional area and loge (original area/ instantaneous area)

C. Load/ instantaneous cross-sectional area and change in length/ original length

D. Load/ instantaneous area and instantaneous area/original area

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4

In a reversible adiabatic process, the ratio of T1/T2 is equal to

A. (p2/p1)γ - 1/ γ

B. (p1/p2)γ - 1/ γ

C. (v2/v1)γ - 1/ γ

D. (v1/v2)γ - 1/ γ

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4

The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is

A. 23.97 bar

B. 25 bar

C. 26.03 bar

D. 34.81 bar

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When a body is subjected to a direct tensile stress (σ) in one plane, then maximum normal stress occurs at a section inclined at __________ to the normal of the section.

A.

B. 30°

C. 45°

D. 90°

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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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The unit of Young's modulus is

A. mm/mm

B. kg/cm

C. Kg

D. kg/cm²

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The change of entropy, when heat is absorbed by the gas, is

A. Positive

B. Negative

C. Positive or negative

D. None of these

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The capacity of a strained body for doing work on the removal of the straining force, is called

A. Strain energy

B. Resilience

C. Proof resilience

D. Impact energy