Question is ⇒ Isothermal compression efficiency, even when running at high speed, can be approached by using, Options are ⇒ (A) multi-stage compression, (B) cold water spray, (C) both (a) and (b) above, (D) fully insulating the cylinder, (E) high stroke., Leave your comments or Download question paper.

Question is ⇒ Isothermal compression efficiency, even when running at high speed, can be approached by using, Options are ⇒ (A) multi-stage compression, (B) cold water spray, (C) both (a) and (b) above, (D) fully insulating the cylinder, (E) high stroke., Leave your comments or Download question paper. Previous question Next question


Q1.	Isothermal compression efficiency, even when running at high speed, can be approached by using
A.	multi-stage compression [Wrong Answer]
B.	cold water spray [Wrong Answer]
C.	both (a) and (b) above [Correct Answer]
D.	fully insulating the cylinder [Wrong Answer]
E.	high stroke. [Wrong Answer]
View Answer 2 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ 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

⇒ 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

⇒ What will be the volume of air at 327°C if its volume at 27°C is 1.5 m3/mt
3 m3/mt .
1.5 m3/mt
18 m3/mt'
6 m3/mt

⇒ The- most efficient method of compressing air is to compress it
isothermally
adiabatically
isentropically
isochronically

⇒ As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio
increases
decreases
remains same
first increases and then decreases

⇒ The hottest point in a gas turbine is
at the base
at the tip
in the center
between ~ to i of the blade height

⇒ Gas turbines for power generation are normally used
to supply base load requirements
to supply peak load requirements
to enable start thermal power plant
in emergency

⇒ More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than
2 kg/cm2
6 kg/cm2
10 kg/cm2
14.7 kg/cm2

⇒ Axial flow compressor has the following advantage over centrifugal compressor
larger air handling ability per unit frontal area
higher pressure ratio per stage
aerofoil blades are used
higher average velocities

⇒ The ratio of isentropic work to euler's work is known as
compressor efficiency
isentropic efficiency
Euler's efficiency
pressure coefficient

⇒ Rotary 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

⇒ 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

⇒ Ratio of indicated h.p. to shaft h.p. in known as
compressor efficiency
isothermal efficiency
volumetric efficiency
mechanical efficiency

⇒ The maximum combustion pressure in gas turbine as compared to I.C. engine is
more
less
same
depends on other factors

⇒ 1 m of air at atmospheric condition weighs approximately
0.5 kg
1.0 kg
1.3 kg
2.2 kg

⇒ The work done per unit mass of air in compression will'be least when n is equal to
1
1.2 ,
1.3
1.4

⇒ The pressure ratio in gas turbines is of the order of
,2:l
4:1
61: 1
9 : 1

⇒ For a compressor, least work will be done if the compression is
is entropic
isothermal
poly tropic
somewhere in between is entropic and isothermal

⇒ There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
remain same
decrease
increase
unpredictable

⇒ The ratio of specific weigh/h.p. of gas turbine and I.C engines may be typically of the order of
1 : 1
2 : 1
4 : 1
1:2

⇒ Atmospheric pressure is 1.03 kg/cm and vapor pressure is 0.03 kg/cm . The air pressure will be
1.03 kg/cm2
1.06 kg/cm2
1.00 kg/cm2
0.53 kg/cm2

⇒ For an irreversible gas turbine cycle, the efficiency and work ratio both depend on
pressure ratio alone
maximum cycle temperature alone
minimum cycle temperature alone
both pressure ratio and maximum cycle temperature

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

⇒ Free air is the air at
atmospheric conditions at any specific location
20°C and 1 kg/cm2 and relative humidity of 36%
0°C and standard atmospheric conditions
15°C and 1 kg/cm2

⇒ Losses in a centrifugal compressor are due to
inlet losses
impeller channel losses
diffuser losses
all of the above

⇒ 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

⇒ 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

⇒ The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation
0.1%
0.5%
1.0%
5%

⇒ For supplying intermittent small quantity of air at high pressure, following compressor is best suited
centrifugal
reciprocating
axial
screw

⇒ The pressure ratio of an ideal vaned compressor with increase in mass flow rate
increases
decreases
remains constant
first decreases and then increases