Description : For heat engine operating between two temperatures (T1>T2), what is the maximum efficiency attainable? A. Eff = 1 – (T2/T1) B. Eff = 1 - (T1/T2) C. Eff = T1 - T2 D. Eff = 1 - (T2/T1)^2
Last Answer : Eff = 1 – (T2/T1)
Description : If a system after undergoing a series of processes, returns to the initial state then (a) process is thermodynamically in equilibrium (b) process is executed in closed system cycle (c) its entropy will ... sum of heat and work transfer will be zero (e) no work will be done by the system.
Last Answer : Answer : d
Description : Pick out the correct statement. (A) Entropy and enthalpy are path functions (B) In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged (C) All the natural processes are reversible in nature (D) Work is a state function
Last Answer : (C) All the natural processes are reversible in nature
Description : A state occurs when a system is in equilibrium a. Natural Environment b. Closed System c. Surrounding d. Isentropic
Last Answer : Natural Environment
Description : The change that the system that undergoes from one equilibrium state to another is known as a. oath b. process c. enthalpy change d. entropy change
Last Answer : process
Description : Increase in the entropy of a system represents the (A) Degradation of energy (B) Decrease in system pressure (C) Increase in the availability of energy (D) Increase in the temperature
Last Answer : Option A
Description : A system is said to be at equilibrium, if the entropy of the system has reached __________ value. (A) Minimum (B) Zero (C) Maximum (D) None of these
Last Answer : C) Maximum
Description : Entropy change for an irreversible process taking system and surrounding together is (A) 0 (B) > 0 (C) < 0 (D) None of these
Last Answer : (B) > 0
Description : It is a common observation that naturally occurring processes have a particular direction associated with them. For instance, heat flows from a hot body to a colder body. The property of a system ... this natural direction of events is called w) energy x) entropy y) enthalpy z) equilibrium
Last Answer : ANSWER: X -- ENTROPY
Description : In reversible non-competitive enzyme activity inhibition (A) Inhibitor bears structural resemblance to substrate (B) Inhibitor lowers the maximum velocity attainable with a given amount of enzyme (C) Km is increased (D) Km is decreased
Last Answer : Answer : B
Description : Total Air Temperature is: a. The maximum temperature attainable by the air when brought to rest, adiabatically b. The temperature indicated on the air temperature thermometer plus the ram rise c. The static air temperature minus the recovery factor d. The recovery factor plus the ram rise
Last Answer : a. The maximum temperature attainable by the air when brought to rest, adiabatically
Description : First law of thermodynamics (a) enables to determine change in internal energy of the system (b) does not help to predict whether the system will or not undergo a change (c) does not enable ... entropy (d) provides relationship between heat, work and internal energy (e) all of the above.
Last Answer : Answer : e
Description : According to first law of thermodynamics (a) work done by a system is equal to heat transferred by the system (b) total internal energy of a system during a process remains constant ( ... , enthalpy and entropy during a process remain constant (d) total energy of a system remains constant
Description : A system whose boundary does not allow the exchange of either matter or energy with the surrounding a. open system b. closed system c. isolated system d. none of the above
Last Answer : isolated system
Description : What is the measure of the energy that is no longer available to perform useful work within the current environment? a. enthalpy b. entropy c. internal energy d. latent heat
Last Answer : entropy
Description : Entropy is transferred by ______. A. Work B. Heat C. Energy D. Work and heat
Last Answer : Heat
Description : During throttling process (a) heat exchange does not take place (b) no work is done by expanding steam (c) there is no change of internal energy of steam (d) all of the above (e) entropy decreases.
Description : For reversible adiabatic process, change in entropy is (a) maximum (b) minimum (c) zero (d) unpredictable (e) negative
Last Answer : Answer : c
Description : Entropy is the measure of: a. The internal energy of a gas b. The heat capacity of a substance c. Randomness or disorder d. The change of enthalpy of a system
Last Answer : Randomness or disorder
Description : Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant (a) pressure (b) temperature (c) volume (d) internal energy (e) entropy.
Description : Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant (a) pressure (b) temperature (c) volume (d) internal energy (e) entropy.
Last Answer : Answer : a
Description : Which of the following is the property of a system (a) pressure and temperature (b) internal energy (c) volume and density (d) enthalpy and entropy (e) all of the above.
Description : Buoyant force is (A) Resultant force acting on a floating body (B) Equal to the volume of liquid displaced (C) Force necessary to keep a body in equilibrium (D) The resultant force on a body due to the fluid surrounding it
Last Answer : Answer: Option D
Description : Buoyant force is (A) The resultant force acting on a floating body (B) The resultant force on a body due to the fluid surrounding it (C) Equal to the volume of liquid displaced (D) The force necessary to maintain equilibrium of a submerged body
Last Answer : Answer: Option B
Description : When a system is in equilibrium for all possible processes, the differential or finite change of entropy is (A) < 0 (B) > 0 (C) = 0 (D) None of these
Last Answer : (A) < 0
Description : Anything that is outside the system boundary is called ________. a. Surrounding b. Natural Environment c. Closed System d. Open System
Last Answer : Surrounding
Description : 1,3,5,2,61,832,236,94,0129,74,13 What comes Next? -Riddles
Last Answer : A Coma.
Description : What is the number that comes next in the sequence? 2, 5, 9, 19, 37, __ (A) 76 (B) 74 (C) 75 (D) 50
Last Answer : Answer: C
Description : What are the names given to constant temperature, constant pressure, constant volume, constant internal energy, constant enthalpy, and constant entropy processes.
Last Answer : Isothermal, isochroic, isobaric, free expression, throttling and adiabatic processes respectively.
Description : In __________ process, there is an increase in entropy with no degradation of energy. (A) Isothermal expansion (B) Isochoric heat addition (C) Polytropic expansion (D) Isobaric heat addition
Last Answer : (A) Isothermal expansion
Description : Which of the following laws of thermodynamic which leads to the definition of entropy? a. First law b. Second law c. Third law d. Law of conservation of energy
Last Answer : Second law
Description : Which of the following occurs in a reversible polytrophic process? a. Enthalpy remains constant b. Internal energy does not change c. Some heat transfer occurs d. Entropy remains constant
Last Answer : Some heat transfer occurs
Description : What is known as the total heat and heat content at various times in the history? a. enthalpy b. entropy c. internal energy d. latent heat
Last Answer : enthalpy
Description : The first law of thermodynamics is based on which of the following principles? a. Conservation of mass b. Conservation of energy c. Action and reaction d. The entropy-temperature relationship
Last Answer : Conservation of energy
Description : The first law of thermodynamics is based on which of the following principles? a. conservation of mass b. the enthalpy-entropy relationship c. action – reaction d. conservation of energy
Last Answer : conservation of energy
Description : What is the energy absorbed during chemical reaction under constant volume conditions? A. Entropy B. Ion exchange C. Enthalpy D. Enthalpy of reaction
Last Answer : Enthalpy
Description : The first law of thermodynamics is based on which of the following principles? A. Conservation of mass B. Conservation of energy C. Action and reaction D. The entropy-temperature relationship
Description : The sum of internal energy (U) and the product of pressure and volume (p.v) is known as A. workdone B. entropy C. enthalpy D. none of these
Description : If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly (a) temperature (b) enthalpy (c) internal energy (d) entropy (e) all of the above.
Description : Total heat of a substance is also known as (a) internal energy (b) entropy (c) thermal capacity (d) enthalpy (e) thermal conductance.
Description : What system in which there is no exchange of matter with the surrounding or mass does not cross its boundaries? a. Open system b. Closed system c. Isolated system d. Non-flow system
Last Answer : Closed system
Description : Rapid speciation following the availability of new environments is known as A) gradualism. B) adaptive radiation. C) species selection. D) punctuated equilibrium.
Last Answer : B) adaptive radiation.
Description : The number of revolutions through which a pulley will rotate from rest if its angular acceleration is increased uniformly from zero to 12 rad per sec2 during 4 sec and then uniformly decreased to 0 rad per sec2 during the next 3 sec would be a.46.4 b.26.74 c.11.6 d.3.2 e.17.7
Last Answer : b. 26.74
Description : 74. Inverter tech AC if usage of AC is more than 1000 hour in a year and per unit cost of electricity is more than rs _________per unit. a) 10 c) 5 b) 7 d) 4
Last Answer : 5
Description : A Gas tank registers1000 kPa. After some gas has been used, the gauge registers 500 kPa. What percent of the gas remains in the tank? a) 64.40% b) 74.60% c) 58.40% d) 54.60% Formula: Pabs = Patm + Pgage & %= P2/P1 * 100%
Last Answer : 54.60%
Description : Find the pressure due to a column of mercury 74.0 cm high. a. 91.80 x 10^3 N/m^2 b. 73.56 x 10^2 N/m^2 c. 9.86 x 10^4 N/m^2 d. 87.2 x 10^4 N/m^2
Last Answer : 9.86 x 10^4 N/m^2
Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91
Last Answer : (B) 0
Description : What is the area under the curve on a temperature –entropy diagram? a. Heat b. work c. entropy d. volume