Question is ⇒ The ratio of isentropic work to euler's work is known as, Options are ⇒ (A) compressor efficiency, (B) isentropic efficiency, (C) Euler's efficiency, (D) pressure coefficient, (E) pressure ratio., Leave your comments or Download question paper.

Question is ⇒ The ratio of isentropic work to euler's work is known as, Options are ⇒ (A) compressor efficiency, (B) isentropic efficiency, (C) Euler's efficiency, (D) pressure coefficient, (E) pressure ratio., Leave your comments or Download question paper. Previous question Next question


Q1.	The ratio of isentropic work to euler's work is known as
A.	compressor efficiency [Wrong Answer]
B.	isentropic efficiency [Wrong Answer]
C.	Euler's efficiency [Wrong Answer]
D.	pressure coefficient [Correct Answer]
E.	pressure ratio. [Wrong Answer]
View Answer 15 -4 Explanation:- Answer : D Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Isothermal compression though most efficient, but is not -practicable because
it requires very big cylinder
it does not increase pressure much
it is impossible in practice
compressor has to run at very slow speed to achieve it

⇒ Compression efficiency is compared against
ideal compression
adiabatic compression
botii isothermal and adiabatic compression
isentropic compression

⇒ Volumetric efficiency is
the ratio of stroke volume to clearance volume
the ratio of the air actually delivered to the amount of piston displacement
reciprocal of compression ratio
index of compressor performance

⇒ The work ratio of simple gas turbine cycle depends on
pressure ratio
maximum cycle temperature
minimum cycle temperature
all of the above

⇒ The volumetric efficiency of compressor with increase in compression ratio will
increase
decrease
remain same
may increase/decrease depending on clearance volume

⇒ Producer gas is produced by
carbonation of coal
passing steam over incandescent coke
passing air and a large amount of steam over waste coal at about 65°C
partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

⇒ The closed cycle in gas turbines
provides greater flexibility
provides lesser flexibility
in never used
is used when gas is to be burnt

⇒ Cylinder clearance in a compressor should be
as large as possible
as small as possible
about 50% of swept volume
about 100% of swept volume

⇒ A compressor at high altitude will draw
more power
less power
same power
more/less power depending on other factors

⇒ The advantage of multistage compression over single stage compression is
lower power consumption per unit of air delivered
higher volumetric efficiency
decreased discharge temperature
moisture free air

⇒ The ratio of the increase in pressure in rotor blades to total increase in pressure in the stage is called
pressure ratio
pressure coefficient
degree of reaction
slip factor

⇒ The maximum compression ratio in an actual single stage axial flow compressor is of the order of
1 : 1.2
1 : 2
1 : 5
1 : 10

⇒ Gas turbine blades are given a rake
equal to zero
in the direction of motion of blades
opposite to the direction of motion of blades
depending on the velocity

⇒ Reciprocating air compressor is best suited for
large quantity of air at high pressure
small quantity of air at high pressure
small quantity of air at low pressure
large quantity of air at low pressure

⇒ The overall isothermal eiffciency of compressor is defined as the ratio of
isothermal h.p. to the BHP of motor
isothermal h.p. to adiabatic h.p.
power to drive compressor to isothermal h.p.
work to compress air isothermally to work for actual compression

⇒ Phenomenon of choking in compressor means
no flow of air
fixed mass flow rate regardless of pressure ratio
reducing mass flow rate with increase in pressure ratio
increased inclination of chord with air steam

⇒ Maximum delivery pressure is a rotary air compressor is of the order of
6 kg/cm2
10 kg/cm2
16 kg/cm2
25 kg/cm2

⇒ The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is
low
high
same
low/high depending on make and type

⇒ Clearance volume in actual reciprocating compressors is essential
to accommodate Valves in the cylinder head
to provide cushioning effect
to attain high volumetric efficiency
to avoid mechanical bang of piston with cylinder head

⇒ Maximum work is done in compressing air when the compression is
isothermal
adiabatic
polytropic
any one of the above

⇒ During base load operation, the best method of controlling compressor is
start-stop motor
constant speed unloaded
relief valve
variable speed

⇒ Mining industry usually employs following motive power
A.C. electric motor
compressed air
petrol engine
diesel engine

⇒ Which is false statement about air receivers
These are used to dampen pulsations ,
These act as reservoir to- take care of sudden demands
These increase compressor efficiency
These knock out some oil and moisture

⇒ Euler's equation is applicable for
centrifugal compressor
axial compressor
pumps
all of the above

⇒ The thermodynamic efficiency of rotary compressor is based on
isothermal compression
adiabatic compression
isentropic compression
polytropic compression

⇒ The ratio of work done per cycle to the swept volume in case of compressor is called
compression index
compression ratio
compressor efficiency
mean effective pressure

⇒ The degree of reaction of an axial flow turbine is the ratio of is entropic temperature drop in a blade row to the
adiabatic temperature drop in the stage
total temperature drop
total temperature drop in the stage
total adiabatic temperature drop

⇒ The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio
increases
decreases
first increases and then decreases
first decreases and then increases

⇒ The criterion of the thermodynamic efficiency for rotary compressor is
isentropic compression
isothermal compression
polytropic compression
any one of the above

⇒ The compressor performance at higher altitude compared to sea level will be
same
higher
lower
dependent on other factors