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This set of Engineering Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Engineering Thermodynamics Set 1
Q1 | A definite area or space where some thermodynamic process takes place is known as
- a) thermodynamic system
- b) thermodynamic cycle
- c) thermodynamic process
- d) thermodynamic law
Q2 | An open system is one in which
- heat & work cross the boundary of the system, but the mass of the working substance does not
- mass of working substance crosses the boundary of the system but the heat & work do not
- both the heat & work as well as mass of the working substance cross the boundary of the system
- neither the heat & work nor the mass of the working substances cross the boundary of the system
Q3 | An isolated system
- a) is a specified region where transfer of energy and/or mass take place
- b) is a region of constant mass & only energy is allowed to cross the boundaries
- c) cannot transfer either energy or mass to or from the surroundings
- d) is one in which mass within the system is not necessarily constant
Q4 | Which of the following is an intensive property of a thermodynamic system
- a) volume
- b) temperature
- c) mass
- d) energy
Q5 | Which of the following is the extensive property of a thermodynamic system
- a) pressure
- b) volume
- c) temperature
- d) density
Q6 | When two bodies are in thermal equilibrium with a third body they are also in thermal equilibrium with eachother. This statement is called
- a) zeroth law of thermodynamics
- b) first law of thermodynamics
- c) second law of thermodynamics
- d) kelvin planck\s law
Q7 | The temperature at which the volume of a gas becomes zero is called
- a) absolute scale of temperature
- b) absolute zero temperature
- c) absolute temperature
- d) none of the above
Q8 | The value of one bar (in SI units) is equalto
- a) 100 n/m??
- b) 1000 n/m??
- c) 1??10⁴ n/m??
- d) 1??10⁵ n/m??
Q9 | The absolute zero pressure will be
- a) when molecular momentum of the systembecomes zero
- b) at sea level
- c) at the temperature of -273 k
- d) under vaccum conditions
Q10 | Absolute zero temperature is taken as
- a) -273??c
- b) 273??c
- c) 237??c
- d) -373??c
Q11 | Which of the following is correct?
- a) absolute pressure= guage pressure+ atmosphericpressure
- b) guage pressure= absolute pressure + atmosphericpressure
- c) atmospheric pressure= absolute pressure+ guagepressure
- d) absolute pressure= guage pressure-atmospheric pressure
Q12 | The unit of energy in SI units is
- a) joule (j)
- b) joule metre (jm)
- c) watt (w)
- d) joule/metre (j/m)
Q13 | One watt is equal to
- a) 1 nm/s
- b) 1n/min
- c) 10 n/s
- d) 100 nm/s
Q14 | One joule (J) is equal to
- a) 1 nm
- b) knm
- c) 10 nm/s
- d) 10 knm/s
Q15 | A series of operations, which take place in a certain order & restore the initialcondition is known as
- a) reversible cycle
- b) irreversible cycle
- c) thermodynamic cycle
- d) none of the above
Q16 | The condition for the reversibility of a cycle is
- a) the pressure & temperature of the working substance must not differ, appreciably, from those of
- a) all the processes, taking place in the cycle of operation, must be extremely slow
- c) the working parts of the engine must be friction free
- d) all of the above
Q17 | According to kinetic theory of heat
- a) temperature should rise during boiling
- b) temperature should fall during freezing
- c) at low temperature all bodies are in solid state
- d) at absolute zero there is absolutely no vibration ofmolecules
Q18 | A system comprising a single phase iscalled a
- a) closed system
- b) open system
- c) isolated system
- d) homogeneous system
Q19 | If all the variables of a stream areindependent of time it is said to be in
- a) steady flow
- b) unsteady flow
- c) uniform flow
- d) closed flow
Q20 | A control volume refers to
- a) a fixed region in space
- b) a specified mass
- c) an isolated system
- d) a reversible process only
Q21 | Internal energy of a perfect gas dependson
- a) temperature, specificheats & pressure
- b) temperature, specificheats & enthalpy
- c) temperature, specific heats& entropy
- d) temperature only
Q22 | Steady flow process requires that
- a) conditions do not change with time at any point
- b) conditions are the same at adjacent points at anyinstant
- c) conditions change steadily with the time
- d) is constant
Q23 | The first law of thermodynamics for steady flow
- a) accounts for all energy entering & leaving a controlvolume
- b) is an energy balance for a specified mass of fluid
- c) is an expression of the conservation of linearmomentum
- d) is primarily concerned with heat transfer
Q24 | Which of the following is not a propertyof the system
- a) temperature
- b) pressure
- c) specific volume
- d) heat
Q25 | The process or systems that do not involve heat are called
- a) isothermal processes
- b) equilibrium processes
- c) adiabatic processes
- d) steady processes