Related Questions
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4
A fusible plug is fitted in small boilers in order to
A. Avoid excessive build up of pressure
C. Extinguish fire if water level in the boiler falls below alarming limit
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4
The coal requirement per kW hour generation in the thermal power plant is of the order of
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4
In order to reduce the rotor speed of an impulse turbine, the method employed is
C. Pressure-velocity compounding
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4
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine
C. Babcock and Wilcox boiler
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4
The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by
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4
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
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4
The actual vacuum in a condenser is equal to
A. Barometric pressure + actual pressure
B. Barometric pressure - actual pressure
C. Gauge pressure + atmospheric pressure
D. Gauge pressure - atmospheric pressure
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4
The number of drums in Benson steam generator is
C. One steam drum and one water drum
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4
The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
D. May be less or more depending on temperature
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4
Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to
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4
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
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4
Thermal efficiency of well maintained boiler will be of the order
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4
The radius of a dished head is taken approximately as
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4
Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will
B. Flash i.e. get converted into steam
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4
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)
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4
The maximum heat loss is a boiler occurs due to
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The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
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4
The function of a flywheel is
A. To convert reciprocating motion of the piston into rotary motion
B. To convert rotary motion of the crankshaft into to and fro motion of the valve rod
C. To prevent fluctuation of speed
D. To keep the engine speed uniform at all load conditions
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4
The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as
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4
The artificial draught is produced by
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4
Size of boiler tubes is specified by
A. Mean diameter and thickness
B. Inside diameter and thickness
C. Outside diameter and thickness
D. Outside diameter and inside diameter
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4
The pressure at which latent heat of vaporisation of water is zero, is
A. Below atmospheric pressure
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4
The velocity of whirl at outlet for an axial discharge turbine is
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4
Fire tube boilers are limited to a maximum design working pressure of
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4
In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is
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4
The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called
A. Induced steam jet draught
C. Forced steam jet draught
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4
An economiser is installed in a boiler primarily to
B. Reduce fuel consumption
C. Increase steam pressure
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4
There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called
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4
In a reaction turbine, when steam flows through the fixed blades,
A. Pressure increases while velocity decreases
B. Pressure decreases while velocity increases
C. Pressure and velocity both decreases
D. Pressure and velocity both increases
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4
The state of vapour under saturation condition is described by
C. Pressure and temperature
D. Pressure and dryness fraction