Basic Law of Thermodynamics - Basic Engg and Science - Mechanical Engg

-

1) The energy of the isolated system is always a constant, which is given by:


(a) Zeroth law of thermodynamics
(b) First law of thermodynamics
(c) Second law of thermodynamics
(d) Third law of thermodynamics
(e) Law of stable equilibrium
                                                                                CGPSC Polytechnic Lecturer 2017

Answer : B 



2) What are the properties of a thermodynamic system whose value for the entire system is equal to the sum of their values for individual parts of the system?

(a) Thermodynamic properties
(b) Extensive properties
(c) Intensive properties
(d) Specific properties
                                                                                TNPSC AE 2018
Answer : B

3) Consider the following properties:
1. Temperature                        2. Viscosity
3. Specific entropy                  4. Thermal conductivity

Which of the above properties of a system
is/are intensive?
(a) 1 only 
(b) 2 and 3 only
(c) 2, 3 and 4 only
(d) 1, 2, 3 and 4
                                                                                Gujarat PSC AE 2019

Answer : D

4) An open system

(a) is a specified region where transfers of
energy and / or mass take place
(b) is a region of constant mass and only energy
is allowed to cross the boundaries
(c) cannot transfer either energy or mass to or
from the surroundings
(d) has an enthalpy transfer across its boundaries
and the mass within the system is not
necessarily constant
                                                                                    BPSC Poly. Lect. 2016
                                                                                    HPPSC Lect. 2016
Answer : A


5) Heat and work are :

(a) Intensive properties
(b) Extensive properties
(c) Point functions
(d) Path functions
                                                                                    OPSC AEE 2019 PAPER - II
                                                                                    UPRVUNL AE 2014
                                                                                    UP Jal Nigam AE 2016
                                                                                    Nagaland PSC CTSE 2017 Paper-2
                                                                                    UKPSC AE 2007 Paper -II
Answer : D

6) Which one of the following is the extensive property of the system?

(a) Volume (b) Pressure
(c) Temperature (d) Density
                                                                                    OPSC AEE 2019 PAPER - II
                                                                                    UPRVUNL AE 2014

Answer : A

7) Which of the following processes are thermodynamically reversible?
(a) Throttling
(b) Free expansion
(c) Constant volume and constant pressure
(d) Isothermal and adiabatic
                                                                                    TNPSC 2019

Answer : D

8) The most efficient method of compressing air is to compress it
(a) adiabatically (b) isentopically
(c) isothermally (d) isochorically
                                                                                    TNPSC 2019

Answer : C

9) Which of the following processes is irreversible process
(a) Isothermal  (b) Adiabatic
(c) Throttling   (d) All of the above
                                                                                    Vizag Steel (MT) 2017

Answer : C

10) The internal energy of an ideal gas is function of
(a) pressure only
(b) absolute temperature only
(c) pressure and volume
(d) pressure, volume and temperature
                                                                                    Gujarat PSC AE 2019
                                                                                    TSPSC AEE 2015
                                                                                    UKPSC AE 2007 Paper -II
                                                                                    OPSC AEE 2015 PAPER - II

Answer : B




Location: Tamil Nadu, India

Comments

Post a Comment

Popular posts from this blog

Transformers MCQ | Part - 1

-
Image
  1. A transformer transforms A. Voltage B. Frequency C. Current and voltage D. Current Answer: C 2. A transformer has negative voltage regulation, only if its load power factor is A. Leading B. Unity C. Lagging D. None of these Answer: A 3. In an autotransformer, the primary and secondary are ....... Coupled. A. Magnetically coupled B. Electrically coupled C. Both magnetically and electrically coupled. D. None of these Answer: C 4. Crushed rocks are provided in the substation to A. To avoid growing plants and weeds. B. To provide insulation C. To avoid fire accidents during leakage of transformer oil. D. All of the above Answer: D 5. The maximum load that a power transformer can carry is limited by its A. Voltage ratio B. Dielectric strength of the coil C. Copper loss D. Temperature rise Answer: A 6. When the supply frequency of a transformer increases, the secondary output voltage of the transformer A. Decreases B. Increases C. Constant D. None of these Answer: C 7. Open circuit ...
Read more

Switchgear And Protection MCQ For TANGEDCO and TRB Exam With Explanation Part-1

-
Image
1. The Following Statement Is Associated With The Buchholz Relay Is Not True (A) It is a gas actuated device (B) It is a current operative device (C) It is placed between the transformer tank and the conservator (D) It causes alarm for minor fault and tripping for major fault Answer.: (B)  It is a current operative device Explanation:– The Buchholz relay is a gas operated relay used for the protection of oil immersed transformers against all the types of internal faults. The slow developing faults called incipient faults in the transformer tank below oil level operate Buchholz relay which gives an alarm. If the faults are severe it disconnects the transformer from the supply. It uses the principle that due to the faults, oil in the tank decomposes, generating the gases. The 70% component of such gases is hydrogen which is light and hence rises upwards towards conservator through the pipe. Buchholz relay is connected to the pipe, as shown in Fig. Due to the gas collected in the uppe...
Read more