Home Thermodynamics Thermodynamics (21-30)

Thermodynamics (21-30)

Thermodynamics By · June 28, 2022 · 2 Comments
21.  Isentropic flow is
A. Irreversible adiabatic flow B. Perfect gas flow
C. Ideal fluid flow D. Reversible adiabatic flow
E. Frictionaless reversible flow  

Answer & Explanation

Answer: Option D

Explanation:
22.  Triple point temperature and pressure for water are
A. 100?C and 1 ata B. 0?C 1 ata
C. 0?C and 0.1 ata D. 0.1?C and 0.006028 ata
E. 0.01?C and 0.006028 ata  

Answer & Explanation

Answer: Option E

Explanation:
23.  Avogadro’s numbers is
A. 6.02486 x 1026 molecules/(k mol) B. 60.2486 x 1026 molecules/(k mol)
C. 602.486 x 1026 molecules/(k mol) D. 6024.86 x 1026 molecules/(k mol)
E. 60248.6 x 1026 molecules/(k mol)  

Answer & Explanation

Answer: Option A

Explanation:
24.  The unit of universal gas constant is
A. erg/?K B. kcal/?K
C. W/?K D. dynes/?K
E. W/m?K  

Answer & Explanation

Answer: Option A

Explanation:
25.  In the regenerative cycle
A. Steam is reheated after expansion and again used B. Power is generated in two stages
C. Part of the steam is withdrawn from the turbine and is used in heating the steam being supplied to the turbine D. Part of the steam is withdrawn from the turbine and is used in heating the feed water
E. Part of the steam is withdrawn from the turbine and is utilised in heating the exhaust steam  

Answer & Explanation

Answer: Option D

Explanation:
26.  If a heat engine gives an output of 3 kW and input is 10,000 J/s the thermal efficiency of the engine will be
A. 30% B. 33.30%
C. 66.60% D. 70%
E. 100%  

Answer & Explanation

Answer: Option A

Explanation:
27.  A reversible process requires that
A. There be no heat transfer B. Newton’s law of viscosity be satisfied
C. Temperature of system and surroundings be equal D. There whould be no viscous or coulomb friction in the system
E. Heat transfer occurs from surrounding to system only  

Answer & Explanation

Answer: Option D

Explanation:
28.  The critical pressure at which latent heat of vaporisation for water is zero is
A. 100 kg/cm2 B. 215.1 kg/cm2
C. 228.6 kg/cm2 D. 235.6 kg/cm2
E. 250.6 kg/cm2  

Answer & Explanation

Answer: Option C

Explanation:
29.  1 kgf/cm2 is equal to
A. 1 mm Hg B. 100 mm Hg
C. 735.6 mm Hg D. 760 mm Hg
E. 776 mm Hg  

Answer & Explanation

Answer: Option C

Explanation:
30.  The first law of thermodynamics, for steady flow
A. Accounts for all energy entering and leaving a control volume B. Is an energy balance for the specified mass of fluid
C. Is an expression of the conservation of linear momentum D. Is primarily concerned with heat transfer
E. Is restricted in its application to perfect gases  

Answer & Explanation

Answer: Option A

Explanation:




imran khan

Related Posts

If in the equation pvn = C, the value of n = 1, then the process is called isothermal process.

A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

A cycle consisting of two constant pressure and two isothermal processes is known as Ericsson cycle.

Select the correct statement as per Charles’ law

The entropy of the universe is continually on the increase.

In a steady flow process, the rate of

For the same maximum pressure and temperature,

The ratio of work doen per cycle to the swept volume in case of compressor is called ______________?

This Post Has 2 Comments

  1. Pingback: Thermodynamics (11-20) - Just Mcqs
  2. Pingback: Thermodynamics (31-40) - Just Mcqs

Leave a Reply

Your email address will not be published. Required fields are marked *