WorksheetsDiagnostics Test 01 in Thermodynamics
Total questions: 50
Worksheet time: 25mins
Name
Class
Date
1.
Enthalpy of an ideal gas is a function only of _____.
a)
internal energy
b)
temperature
c)
entropy
d)
pressure
2.
Which of the following is the most efficient thermodynamic cycle?
a)
Otto
b)
Diesel
c)
Brayton
d)
Carnot
3.
What is the first law of thermodynamics?
a)
energy can neither be created nor destroyed
b)
internal energy is due to molecular motions
c)
heat energy cannot be completely transformed into work
d)
entropy of the universe is increased by irreversible process
4.
An ideal gas is compressed isothermally. What is the enthalpy change?
a)
zero
b)
always negative
c)
undefined
d)
always positive
5.
Name the process that has no heat transfer.
a)
Adiabatic
b)
Polytropic
c)
Isobaric
d)
Isothermal
6.
An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of the gas
a)
zero
b)
remain constant
c)
decreases
d)
increases
7.
What is the SI unit of pressure?
a)
dynes/cm²
b)
kg/cm²
c)
Psi
d)
Pascal
8.
The equation Cₚ = Cᵥ + R applies to which of the following?
a)
two phase states
b)
all pure substances
c)
ideal gas
d)
enthalpy
9.
In the flow process, neglecting kinetic and potential energies, the integral of Vdp represents what?
a)
shaft work
b)
flow energy
c)
heat transfer
d)
enthalpy change
10.
Mechanical energy of pressure transformed into energy of heat.
a)
Heat exchanger
b)
Heat compression
c)
Enthalpy
d)
Kinetic energy
11.
The theory of changing heat into mechanical work.
a)
Kinematics
b)
Thermodynamics
c)
Kinetics
d)
Inertia
12.
Average pressure on a surface when a changing pressure condition exist.
a)
Partial pressure
b)
Back pressure
c)
Pressure drop
d)
Mean effective pressure
13.
Which of the following cycle consists two isothermal and two constant volume processes?
a)
Ericsson cycle
b)
Diesel cycle
c)
Otto cycle
d)
Stirling Cycle
14.
A control volume refers to what?
a)
A specified mass
b)
An isolated system
c)
A fixed region on space
d)
A reversible process
15.
In the polytropic process, PVⁿ = constant, if the value of n is infinitely large, the process is
a)
polytropic
b)
isothermal
c)
isobaric
d)
isometric
16.
If the temperature is held constant and the pressure is increased beyond the saturation pressure , then the working medium must be:
a)
saturated liquid
b)
saturated vapor
c)
subcooled liquid
d)
compressed liquid
17.
Is one whose temperature is below the saturation temperature corresponding to its pressure.
a)
Wet vapor
b)
Subcooled liquid
c)
Superheated vapor
d)
Saturated liquid
18.
Number of molecules in a mole of any substance is a constant called _____.
a)
Avogadro's number
b)
Thompson constant
c)
Otto constant
d)
Rankine constant
19.
If the pressure of a gas is constant, the volume is directly proportional to the absolute temperature.
a)
Boyle's law
b)
Kelvin's law
c)
Joule's law
d)
Charles' Law
20.
The number of protons in the nucleus of an atom or the number of electrons in the orbit of an atom.
a)
Atomic volume
b)
Atomic number
c)
Atomic weight
d)
Atomic mass
21.
In a P-T diagram of a pure substance, the curve separating the solid phase from the liquid phase is:
a)
fusion curve
b)
vaporization curve
c)
sublimation point
d)
boiling point
22.
A water temperature of 18 °F in the water cooled condenser is equivalent in °C to _____.
a)
10
b)
263.56
c)
7.78
d)
-9.44
23.
The latent heat of vaporization in Joules per kg is equal to _____.
a)
22.6 x 10⁵
b)
5.4 x 10²
c)
4.13 x 10³
d)
3.35 x 10⁵
24.
Form of energy associated with the kinetic energy of the random motion of large number of molecules.
a)
Heat of fusion
b)
Kinetic energy
c)
Internal energy
d)
Heat
25.
If the temperature is held constant and the pressure is increased beyond the saturation pressure, then, the working medium must be:
a)
saturated vapor
b)
subcooled liquid
c)
compressed liquid
d)
saturated liquid
26.
Is the condition of pressure and temperature at which a liquid and its vapor are indistinguishable.
a)
Dew point
b)
Relative humidity
c)
Absolute humidity
d)
Critical point
27.
When a substance in gaseous state is below the critical temperature, it is called _____.
a)
cloud
b)
moisture
c)
vapor
d)
steam
28.
Superheated vapor behaves
a)
just as ordinary vapor
b)
approximately as a gas
c)
just as gas
d)
just as steam
29.
Which of the following provides the basis for measuring thermodynamic property of temperature?
a)
Second law of thermodynamics
b)
Third law of thermodynamics
c)
First law of thermodynamics
d)
Zeroth law of thermodynamics
30.
Which of the following is commonly used as liquid absorbent?
a)
Ethylene glycol
b)
Silica gel
c)
Activated alumina
d)
None of these
31.
Mechanism designed to lower the temperature of air passing through it.
a)
Air cooler
b)
Air defense
c)
Air cycle
d)
Air spill over
32.
A device for measuring the velocity of wind.
a)
Anemometer
b)
Anemograph
c)
Aneroid barometer
d)
Anemoscope
33.
Heat normally flowing from a high temperature body to a low temperature body wherein it is impossible to convert heat without other effects.
a)
second law of thermodynamics
b)
zeroth law of thermodynamics
c)
third law of thermodynamics
d)
first law of thermodynamics
34.
The temperature at which its vapor pressure is equal to the pressure exerted on the liquid.
a)
Thermal point
b)
Absolute humidity
c)
Calorimetry
d)
Boiling point
35.
A nozzle is used to
a)
increase velocity as well as pressure
b)
decrease velocity as well as pressure
c)
increase velocity and decrease pressure
d)
decrease velocity and increase pressure
36.
The sum of the energies of all the molecules in a system where energies appear in several complex form.
a)
frictional energy
b)
potential energy
c)
kinetic energy
d)
internal energy
37.
The total energy in a compressible or incompressible fluid flowing across any section in a pipeline is a function of
a)
Flow energy, kinetic energy, height above datum and internal energy
b)
Pressure and velocity
c)
Pressure, density and velocity
d)
Pressure , density ,velocity and viscosity
38.
The ratio of the density of a substance to the density of some standard substance.
a)
Specific gravity
b)
Relative gravity
c)
Relative density
d)
Specific density
39.
Is one whose pressure is higher than the saturation pressure corresponding to its temperature.
a)
Super heated vapor
b)
Saturated liquid
c)
Compressed liquid
d)
Saturated vapor
40.
The changing of solid directly to vapor without passing through the liquid state is called
a)
Sublimation
b)
Condensation
c)
Evaporation
d)
Vaporization
41.
Weight per unit volume is termed as
a)
Density
b)
Specific volume
c)
Specific gravity
d)
Weight density
42.
What is the SI unit of force?
a)
Pound
b)
Dyne
c)
kilogram
d)
Newton
43.
The volume of fluid passing a cross-section of steam in unit time.
a)
Discharge
b)
Uniform flow
c)
Steady flow
d)
Continuous flow
44.
What equation applies in the first law of thermodynamics for an ideal gas in a reversible open steady state system?
a)
Q - PdV = H₂ - H₁
b)
Q - W = U₂ - U₁
c)
Q - Vdp = U₂ - U₁
d)
Q + VdP = H₂ - H₁
45.
A pressure of 1 millibar is equivalent to
a)
1000 psi
b)
1000 cm of Hg
c)
1000 kg/cm²
d)
1000 dynes/cm²
46.
When a system deviates infinitesimally from equilibrium at every instant of its state, it is undergoing
a)
quasi-static process
b)
isometric process
c)
isobaric process
d)
cyclic process
47.
What is the force which tends to draw a body toward the center about which it is rotating?
a)
Centripetal force
b)
centrifugal in motion
c)
centrifugal force
d)
centrifugal advance
48.
What is the process that has no heat transfer?
a)
Polytropic
b)
Adiabatic
c)
Reversible isometric
d)
Isothermal
49.
Which of the engine is used for fighter bombers?
a)
Pulsejet
b)
Turbojet
c)
Ramjet
d)
Rockets
50.
Exhaust gases from an engine posses:
a)
solar energy
b)
stored energy
c)
chemical energy
d)
kinetic energy
100 %
