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4

The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

A. 180° to each other

B. 90° to each other

C. 0° to each other

D. None of these

Correct Answer :

A. 180° to each other


Related Questions

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4

On Millier chart, the constant pressure lines

A. Diverge from left to right

B. Diverge from right to left

C. Are equally spaced throughout

D. First rise up and then fall

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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

A binary vapour plant consists of

A. Steam turbine

B. Steam condenser

C. Mercury boiler

D. All of these

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4

The effect of friction on the flow of steam through a nozzle is to

A. Decrease the mass flow rate and to increase the wetness of steam

B. Increase the mass flow rate and to increase the exit temperature

C. Decrease the mass flow rate and to decrease the wetness of steam

D. Increase the exit temperature without any effect on mass flow rate

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4

Blow off cock in a boiler is used to

A. Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

B. Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

C. Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

D. Increase the temperature of saturated steam without raising its pressure

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4

The length of shell of a Locomotive boiler is

A. 1 m

B. 2 m

C. 3 m

D. 4 m

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4

Which device is used in thermal power plants to reduce level of pollution?

A. Induced draft fan

B. Smoke meter

C. Chimney

D. Precipitator

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4

The critical pressure ratio for initially dry saturated steam is

A. 0.546

B. 0.577

C. 0.582

D. 0.601

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4

Proximate analysis of fuel is determination of percentage of

A. Carbon, hydrogen, nitrogen, sulphur, moisture

B. Fixed carbon, ash, volatile matter, moisture

C. Higher calorific value

D. Lower calorific value

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4

In order to reduce the rotor speed of an impulse turbine, the method employed is

A. Velocity compounding

B. Pressure compounding

C. Pressure-velocity compounding

D. All of these

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4

Cochran boiler is a

A. Horizontal fire tube boiler

B. Horizontal water tube boiler

C. Vertical water tube boiler

D. Vertical fire tube boiler

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4

Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

A. Boil

B. Flash i.e. get converted into steam

C. Remain as it was

D. Cool down

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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

In forced recirculation type boiler,

A. Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C. Feed pump is employed to supplement natural circulation in water wall type furnace

D. Water is converted into steam in one pass without any recirculation

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4

The velocity of whirl at outlet for an axial discharge turbine is

A. Minimum

B. Maximum

C. Zero

D. None of these

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4

Cut-off governing as compared to throttle governing is

A. Less efficient and less economical

B. Less efficient and more economical

C. More efficient and less economical

D. More efficient and more economical

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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

The overall efficiency of thermal power plant is

A. Boiler efficiency, turbine efficiency, generator efficiency

B. All the three above plus gas cycle efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency

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4

One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

A. 0.2

B. 0.8

C. 1.0

D. 0.6

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4

The amount of water evaporated in kg per kg of fuel burnt is called

A. Evaporative capacity of a boiler

B. Equivalent evaporation from and at 100° C

C. Boiler efficiency

D. None of these

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4

The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be

A. 0.4

B. 0.56

C. 0.67

D. 1.67

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4

The safety valve at superheater as compared to drum safety valve setting is set at

A. Higher value

B. Lower value

C. Same value

D. Any value

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4

The reheat factor is the ratio of the

A. Cumulative heat drop to the isentropic heat drop

B. Isentropic heat drop to the heat supplied

C. Total useful heat drop to the total isentropic heat drop

D. None of the above

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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

Efficiency of a thermal cycle increases by

A. Regeneration

B. Reheating of steam

C. Both (A) and (B)

D. Cooling of steam

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4

Presence of moisture in fuel oil would

A. Keep the burner tips cool

B. Aid in proper combustion

C. Because sputtering, possibly extinguishing flame

D. Clean the nozzles

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4

Which of the following statement is correct?

A. The efficiency of steam turbines is greater than steam engines

B. A flywheel is a must for steam turbine

C. The turbine blades do not change the direction of steam issuing from the nozzle

D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades

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4

Pick up the wrong statement about critical condition of steam

A. Latent heat is zero

B. Liquid directly becomes steam

C. Specific volume of steam and liquid is same

D. This is the maximum pressure limit

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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 ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

A. Blading efficiency

B. Nozzle efficiency

C. Stage efficiency

D. Mechanical efficiency