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WorksheetsBlue book terms terms 201-275
Total questions: 76
Worksheet time: 38mins
After passing through a convergent-divergent nozzle the temperature of air will:
Increase
Decrease
Remains the same
None of these
By increasing the temperature source of Carnot cycle, which of the following will not be affected?
Efficiency
Work
Heat added
Heat rejected
By decreasing the temperature sink of Carnot cycle, which of the following will not be affected?
Efficiency
Work
Heat added
Heat rejected
By superheating the refrigerant in vapor compression cycle with useful cooling, which of the following will increase? (use per unit mass analysis)
Condenser pressure
Evaporator pressure
Quality after expansion
Heat rejected from condenser
By superheating the refrigerant in vapor compression cycle with useful cooling, which of the following will decrease? (use per unit mass analysis)
Refrigerated effect
COP
Compressor power
Mass flow rate
By superheating the refrigerant in vapor compression cycle without useful cooling, which of the following will decrease? (use per unit mass analysis)
Heat rejected
COP
Compressor power
Specific volume at suction
By superheating the refrigerant in vapor compression cycle without useful cooling, which of the following will increase? (use per unit mass analysis)
Heat rejected
COP
Compressor power
Specific volume at suction
By superheating the refrigerant in vapor compression cycle without useful cooling, which of the following will not be affected? (use per unit mass analysis)
Refrigerated effect
COP
Compressor power
Mass flow rate
By sub-cooling the refrigerant in vapor compression cycle at condenser exit, which of the following will increase? (use per unit mass analysis)
Refrigerated effect
Specific volume at suction
Compressor power
Mass flow rate
By sub-cooling the refrigerant in vapor compression cycle at condenser exit, which of the following will decrease? (use per unit mass analysis)
Refrigerated effect
Specific volume at suction
Compressor power
Mass flow rate
By increasing the vaporizing temperature in vapor compression cycle, which of the following will increase? (Use per unit mass analysis)
mass flow rate
COP
specific volume at suction
compressor work
By increasing the vaporizing temperature in vapor compression cycle, which of the following will decrease? (Use per unit mass analysis)
Refrigeration effect
COP
evaporator temperature
Temperature difference between evaporator and compressor
By increasing the condenser pressure in vapor compression cycle, which of the following will increase? (Use per unit mass analysis)
moisture content after expansion
compressor power
heat rejected from condenser
mass flow rate
If the pressure drop in the condenser Increases in a vapor compression cycle, which of the following will increase? (Use per unit mass analysis)
mass flow rate
compressor power
heat rejected in the condenser
specific volume of suction
If the pressure drop in the condenser increases in a vapor compression cycle, which of the following will decrease? (Use per unit mass analysis)
Refrigeration effect
mass flow rate
heat rejected in the condenser
compressor power
If the pressure drop in the condenser increases in a vapor compression cycle, which of the following will not be affected? (Use per unit mass analysis)
compressor power
mass flow rate
heat rejection in the condenser
COP
If the pressure drop in the evaporator increases in a vapor compression cycle, which of the following will increase? (Use per unit mass analysis)
Refrigerating effect
vaporizing temperature
heat rejected in the condenser
COP
If the pressure drop in the evaporator increases in a vapor compression cycle, which of the following will decrease? (Use per unit mass analysis)
specific volume at suction
compressor power
heat rejected in the condenser
COP
By lowering the condenser pressure in Rankine cycle, which of the following will decrease? (Use per unit mass analysis)
pump work
turbine
heat rejected
cycle efficiency
By increasing the boiler pressure in Rankine cycle, which of the following will decrease? (Use per unit mass analysis)
heat rejected
pump work
cycle efficiency
moisture
By superheating the steam to a higher temperature in Rankine cycle, which of the following will decrease? (Use per unit mass analysis)
moisture content at the turbine exhaust
turbine work
heat added
heat rejected
By superheating the steam to a higher temperature in Rankine cycle, which of the following will increase? (Use per unit mass analysis)
moisture content at the turbine exhaust
pump work
condenser pressure
cycle efficiency
By reheating the steam before entering the second stage in Rankine cycle, which of the following will decrease?
turbine work
moisture content after expansion
heat added
heat rejected
When Rankine cycle is modified with regeneration, which of the following will increase?
turbine work
heat added
heat rejected
cycle efficiency
Is the combination of base load and peaking load.
rated load
intermediate load
combine load
over-all load
Sum of the maximum demand over the simultaneous maximum demand.
use factor
capacity factor
demand factor
diversity factor
Regenerative with feed heating cycle with infinite number of feedwater heaters thus efficiency is equal to:
otto cycle
stirling cycle
ericson cycle
carnot cycle
A type of turbine used in desalination of sea water.
back pressure turbine
passout turbine
peaking turbine
reaction turbine
States that when conductor and magnetic field move relatively to each other, an electric voltage is induced in the conductor.
Maxwell’s law
Kirchoff’s law
Faraday’s law
Newtons law
Transfers heat directly to electrical energy by utilizing thermionic emissions.
Thermionic motor
Thermionic generator
Thermionic converter
Thermionic cell
Is the largest group of coal containing 46-86% of fixed carbon and 20 to 40% volatile matter.
anthracite
sub-anthracite
Bituminous
Sub-bituminous
When 1 gram of coal is subjected to a temperature of about 105⁰C for a period of 1 hour, the loss in weight of the sample gives the:
volatile matter
ash
Fixed carbon
moisture content
When 1 gram of sample of coal is placed in a crucible and heated 950⁰C and maintain at that temperature for 7 minutes there is a loss in weight due to elimination of:
volatile matter and moisture
ash
Fixed carbon
moisture content
Consist of hydrogen and certain hydrogen carbon compounds which can be removed from coal by heating.
moisture content
product of combustion
ash
volatile matter
By heating 1 gram of coal in an uncovered crucible until the coal is completely burned, the __ will formed.
volatile matter and moisture
ash
Fixed carbon
moisture content
Caking coal are used to produce coke by heating in a coke oven in the absence of __ with volatile matter driven off.
air
oil
oxygen
nitrogen
Grindability of standard coal is
80
90
100
110
Major constituent of all natural gases is
ethane
methane
propane
Cethane
Two types of fans are:
centrifugal and axial
reciprocating and axial
centrifugal and rotary
tangential and rotary
Enthalpy of substance at specified state due to chemical composition.
enthalpy of reaction
enthalpy of combustion
enthalpy of formation
enthalpy of product
A type of boiler used for duper critical pressure operation.
La Mont boiler
Once through-circulation boiler
Force circulation boiler
Natural circulation boiler
Economizer in a water tube boiler is heated by:
electric furnace
electric current
incoming flue gas
outgoing flue gas
Receives heat partly by convection and partly by radiation.
radiant superheater
desuperheater
convective superheater
pendant superheater
Regenerative superheater is a storage type of heat exchangers have an energy storage medium called.
matrix
regenerator
Boiler
Recuperator
Stirling cycle uses a ____ as working fluids.
incompressible gas
incompressible fluids
compressible refrigerant
compressible fluids
In Striling process, the heat is added during
Isobaric process
Isentropic process
Isothermal process
Heat process
Brayton cycle is known as
Carnot cycle
Joule cycle
Carnot cycle
Rankine cycle
It is applied to propulsion of vehicle because of certain practical characteristics.
Diesel cycle
Otto cycle
Carnot cycle
Brayton cycle
Heat exchangers typically involve
no work interaction
no heat interaction
no energy interaction
none of these
A device that is used to convert the heat to work is called
Adiabatic
Regenerator
Heat engines
None of these
The objective of a heat pump is to maintain a heated space at
Low temperature
High temperature
Medium temperature
None of these
A device that violates the second law of thermodynamics is called
perpetual motion machine of second kind
perpetual motion machine of third kind
perpetual motion machine of the first kind
none of these
A process is called _____ if no irreversibilities occur outside the system boundaries during the process.
externally reversible
internally reversible
reversible
none of these
An energy interaction which is not accompanied by entropy transfer is
energy
heat
work
none of these
A _____ is used in aircraft engines and some automotive engine. In this method, a turbine driven by the exhaust gases is used to provide power to compressor or blower at the inlet.
discharging
turbocharging
supercharging
scavenging
The only device where the changes in kinetic energy are significant are the
compressor
pumps
nozzles and diffusers
none of these
The distance between TDC and BDC in which the piston can travel is the
right extreme position
displacement stroke
stroke of the engine
swept stroke
In compression-engine the combustion of air-fuel mixture is self-ignited as a result of compressing the mixture above its
self developed temperature
mixing temperature
self feed temperature
self ignition temperature
The thermal efficiency of an ideal Otto cycle depends _______ of the working fluid.
the pressure ratio of the engine and the specific ratio
the pressure ratio of the engine and the specific ratio
the moles ratio of the engine and the specific heat ratio
the compression ratio of the engine and the specific heat ratio
Using monoatomic gas, the thermal efficiency of Otto cycle
increases
decreases
remains constant
none of these
In diesel engine, combustion process during combustion occurs during
isothermal process
constant pressure process
isentropic process
adiabatic
If the cutoff ratio decreases, the efficiency of diesel cycle
increases
decreases
remains constant
none of these
If Erickson cycle , the regeneration process occur during ______ process.
constant volume
constant temperature
constant pressure
none of these
In Brayton cycle, the ____ during constant pressure process.
work is added
heat is transferred
pressure is rejected
energy is added
The two major application areas of gas turbine engines are
driving automotive engine and locomotives
heating and generation
aircraft propulsion and electric power generation
none of these
The use of regenerator in is recommended only when the turbine exhaust temperature is higher than the compressor.
exit temperature
inlet temperature
mean temperature
absolute temperature
As the number of stages is increased, the expansion process becomes
isentropic
isothermal
isometric
polytropic
Aircraft gas turbines operate at higher pressure ratio typically between
6 to 8
12 to 24
10 to 18
10 to 25
The first commercial high-pass ratio engines has a bypass ratio of
1
3
5
7
The single-stage expansion process of an ideal brayton cycle without regeneration is replace by a multistage expansion process with reheating between the same pressure limits. As a result of modification, thermal efficiency will:
Increase
Decrease
Remain constant
none of these
Which of the following is/are the application of Brayton cycle
Propulsion system
Automotive Turbine Engines
Aircraft Turbine engines
all of these
It used as working fluid in high-temperature application of vapor cycle?
Helium
Deuterium
Mercury
Water
The superheat vapor enters the turbine and expands isentropically and produces work by the rating shaft. The _________ may drop, during the process.
density
Viscosity of fuel
Temperature and pressure
none of these
Only________ of the turbine work output is required to operate the pump
0.01%
0.02%
0.03%
0.04%
After passing through a convergent-divergent nozzle the density of air will:
Increase
Decrease
Remains the same
None of these
After passing through a convergent-divergent nozzle the mach number of air will:
Increase
Decrease
Remains the same
None of these
