MCQ
2141.
Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure?
Enthalpy
Volume
Mass
Entropy
2142.
Which of the following is an extensive property?
Volume
Pressure
Viscosity
All of the above
2143.
In an isolated system, can be transferred between the system and its surrounding.
Only energy
Only mass
Both energy and mass
Neither energy nor mass
2144.
The same volume of all gases would represent their-
Densities
Specific weights
Molecular weights
Gas characteristic constants
2145.
To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is-
Divided by its molecular weight
Multiplied by its molecular weight
Multiplied by its density
Multiplied by its specific weight
2146.
The entropy in an irreversible cyclic process is -
Remains constant
Decrease
Increase
None of them
2147.
For the same heat input and same compression ration.
Otto cycle and diesel cycle are equally efficient
Otto cycle is less efficient than diesel cycle
Efficiency depends mainly on working substance
None of the above
2148.
An isobaric process, has constant-
Density
Temperature
Pressure
Volume
2149.
A process in which the temperature of the working substance remains constant during its expansion or compression is called-
Isothermal process
Hyperbolic process
Adiabatic process
Polytrophic process
2150.
Which is true for adiabatic process?
∆W = 0
∆Q = 0
∆W=0
∆P=0
2151.
Workdone in free expansion process is-
Zero
Minimum
Maximum
Positive
Himalay Sen Sir
মেকানিক্যাল ইঞ্জিনিয়ারিং MCQ
থার্মোডায়নামিক্স mcq
mechanical mcq
মেকানিক্যাল বিগত সালের প্রশ্ন সমাধান
ব্যাখ্যা: There is no restraining/opposing force or pressure as expansion occurs against vacuum. So, dw = 0 (in case of free expansion).
2152.
An isolated system is one in which-
Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
2153.
A mixture of gas expands from 0.03m to 0.06^3m at a constant pressure of 1 mpa and absorbs 84kj of heat during the process. The change in internal energy of the mixture is-
30 kj
54 kj
84 kj
114 kj
2154.
The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (Cv) is-
Equal to one
Less than one
Greater than one
None
2155.
If the value of n = 0 in the equation PV^n = C, then the process is called-
Constant volume process
Adiabatic process
Constant pressure process
Isothermal process
Himalay Sen Sir
মেকানিক্যাল ইঞ্জিনিয়ারিং MCQ
থার্মোডায়নামিক্স mcq
mechanical mcq
মেকানিক্যাল বিগত সালের প্রশ্ন সমাধান
ব্যাখ্যা: Constant Pressure Process (n= 0)
Isothermal Process (n = 1)
[BREB-2014]
Adiabatic Process (n = y)
Polytropic Process (y> n > 1)
Constant Volume Process (n = ∞)
PV°=C
⇒ P=C [V°=1]
2156.
The extensive properties of a system,-
Are independent of the mass of the system
Depend upon temperature of the system
Depend upon the mass of the system
None of the above
2157.
Work done in an adiabatic process between a given pair of end states depends on-
The end states only
particular adiabatic process
The value of index n
The value of heatt ransferred
2158.
The entropy in an irreversible cyclic process.
Remain constant
Decreases
Increase
First increase then decrease
2159.
An ideal gas as compared to a real gas at very high pressure occupies-
More volume
Less volume
Same volume
Unpredictable behaviour
2160.
The value of n = 1 in the polytropic process indicates it to be-
Reversible process
Isothermal process
Adiabatic process
Irreversible process