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What is the correct answer?

4

A condenser where circulating water flows through tubes which are surrounded by steam, in known as

A. Surface condenser

B. Jet condenser

C. Barometric condenser

D. Evaporative condenser

Correct Answer :

A. Surface condenser


Related Questions

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4

100% efficiency of a thermal cycle cannot be achieved because of

A. Frictional losses

B. It is not possible to achieve 0°K temperature

C. Leakage

D. Non availability of ideal substance

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4

The specific heat of superheated steam in kcal/kg is generally of the order of

A. 0.1

B. 0.3

C. 0.5

D. 0.8

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4

A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

A. Blow off cock

B. Fusible plug

C. Superheater

D. Stop valve

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4

The shell of the Cochran boiler is made hemispherical

A. To give maximum space and strength

B. To withstand the pressure of steam inside the boiler

C. Both (A) and (B)

D. None of the above

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4

In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is

A. 40 %

B. 25 %

C. 50 %

D. 80 %

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4

In regenerative air preheaters, the heat is transferred

A. From a metal wall from one medium to another

B. From heating an intermediate material and then heating the air from this material

C. By direct mixing

D. Heat is transferred by bleeding some gas from furnace

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4

Vacuum for reciprocating steam engines compared to steam turbines is

A. More

B. Equal

C. Less

D. Could be more or less depending on the size of plant

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4

In cross compounding, the cylinders are arranged

A. Side by side and each cylinder has common piston, connecting rod and crank

B. Side by side and each cylinder has separate piston, connecting rod and crank

C. At 90° and each cylinder has common piston, connecting rod and crank

D. At 90° and each cylinder has separate piston, connecting rod and crank

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4

The feed check valve is used in order to

A. Regulate flow of boiler water

B. Check level of water in boiler drum

C. Recirculate unwanted feed water

D. Allow high pressure feed water to flow to drum and not allow reverse flow to take place

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4

The theoretical indicator diagram of a simple steam engine is based upon the assumption that

A. There is no pressure drop due to condensation

B. Steam is admitted at boiler pressure and exhausted at condenser pressure

C. The expansion (or compression) of the steam is hyperbolic

D. All of the above

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4

Rateau turbine is

A. Simple reaction turbine

B. Velocity compounded turbine

C. Pressure compounded turbine

D. Pressure-velocity compounded turbine

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4

Which of the following is required for a steam condensing plant?

A. Condenser

B. Condensate pump

C. Air extraction pump

D. All of these

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4

The pressure at which latent heat of vaporisation of water is zero, is

A. Below atmospheric pressure

B. 1 kg/cm²

C. 100 kg/cm²

D. 225.6 kg/cm²

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4

In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

A. 56 %

B. 63 %

C. 74 %

D. 78 %

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4

The saturation temperature of steam with increase in pressure increases

A. Linearly

B. Rapidly first and then slowly

C. Slowly first and then rapidly

D. Inversely

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4

The working pressure range for a LaMont boiler is

A. 0.5 to 10 MN/m²

B. 1 to 15 MN/m²

C. 2.5 to 15 MN/m²

D. 3.5 to 20 MN/m²

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4

An economiser _________ the steam raising capacity of a boiler.

A. Increases

B. Decreases

C. Has no effect on

D. None of these

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4

In a nozzle, whole frictional loss is assumed to occur between

A. Inlet and throat

B. Inlet and outlet

C. Throat and exit

D. All of these

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4

The change in internal energy in steam engines equals to

A. Work done during the Rankine cycle

B. Work done during compression

C. Work done during adiabatic expansion

D. Change in enthalpy

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4

The biggest size of thermal power unit operating in India is

A. 30 MW

B. 60 MW

C. 100 MW

D. 500 MW

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4

The critical pressure gives the velocity of steam at the throat

A. Equal to the velocity of sound

B. Less than the velocity of sound

C. More than the velocity of sound

D. None of these

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4

The clearance in the engine cylinder

A. Increases the mean effective pressure

B. Increases the workdone

C. Decreases the efficiency of the engine

D. All of these

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4

Efficiency of Rankine cycle can be increased by

A. Decreasing initial steam pressure and temperature

B. Increasing exhaust pressure

C. Decreasing exhausts pressure

D. Increasing the expansion ratio

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4

In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

A. Lancashire boiler

B. Locomotive boiler

C. Babcock and Wilcox boiler

D. Benson boiler

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4

1 kg.m is equal to

A. 9.81 Joules

B. 102 Joules

C. 427 Joules

D. None of these

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4

The expansion of steam, as it flows over the blades in reaction turbine, represents

A. Isothermal process

B. Isentropic process

C. Throttling process

D. Free expansion process

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4

A condenser where circulating water flows through tubes which are surrounded by steam, in known as

A. Surface condenser

B. Jet condenser

C. Barometric condenser

D. Evaporative condenser

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4

Willians line follows the law (where b = A constant representing the shape of the Willians line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

A. I.P. = a × m + b

B. m = a + b × I.P.

C. I.P. = b × m + a

D. m = (b/I.P.) - a

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4

The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.

A. Equal to

B. Less than

C. Higher than

D. None of these

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4

The nozzle efficiency is the ratio of

A. Workdone on the blades to the energy supplied to the blades

B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

D. None of the above