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Previous year question hub

Energy Balances for Closed Systems and Control Volumes - First Law of Thermodynamics - Engineering Sciences Previous Year Questions

Practice Energy Balances for Closed Systems and Control Volumes - First Law of Thermodynamics - Engineering Sciences previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

20Papers
20Years
110Questions
1Topics

Energy Balances for Closed Systems and Control Volumes question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Energy Balances for Closed Systems and Control Volumes. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Medium 61 55.5%
Easy 43 39.1%
Hard 6 5.5%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 65 59.1%
Numerical Answer Type (NAT) 40 36.4%
Fill in the blanks 3 2.7%
MSQ 2 1.8%

Subject weightage

Top subjects by unique question coverage.

Engineering Sciences
110 Qs

Most asked topics

Top topics across the included previous year papers.

First Law of Thermodynamics
110 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Energy Balances for Closed Systems and Control Volumes
110 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Engineering Sciences (XE) 2026
4 Qs
Engineering Sciences (XE) 2025
7 Qs
Engineering Sciences (XE) 2024
6 Qs
Engineering Sciences (XE) 2023
6 Qs
Engineering Sciences (XE) 2022
4 Qs
Engineering Sciences (XE) 2021
6 Qs
Engineering Sciences (XE) 2020
4 Qs
Engineering Sciences (XE) 2019
2 Qs
Engineering Sciences (XE) 2018
7 Qs
Engineering Sciences (XE) 2017
4 Qs
Engineering Sciences (XE) 2016
6 Qs
Engineering Sciences (XE) 2015
6 Qs
Engineering Sciences (XE) 2014
5 Qs
Engineering Sciences (XE) 2013
5 Qs
Engineering Sciences (XE) 2012
5 Qs
Engineering Sciences (XE) 2011
6 Qs
Engineering Sciences (XE) 2010
6 Qs
Engineering Sciences (XE) 2009
5 Qs
Engineering Sciences (XE) 2008
10 Qs
Engineering Sciences (XE) 2007
6 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
Engineering Sciences (XE) 202620264View paper
Engineering Sciences (XE) 202520257View paper
Engineering Sciences (XE) 202420246View paper
Engineering Sciences (XE) 202320236View paper
Engineering Sciences (XE) 202220224View paper
Engineering Sciences (XE) 202120216View paper
Engineering Sciences (XE) 202020204View paper
Engineering Sciences (XE) 201920192View paper
Engineering Sciences (XE) 201820187View paper
Engineering Sciences (XE) 201720174View paper
Engineering Sciences (XE) 201620166View paper
Engineering Sciences (XE) 201520156View paper
Engineering Sciences (XE) 201420145View paper
Engineering Sciences (XE) 201320135View paper
Engineering Sciences (XE) 201220125View paper
Engineering Sciences (XE) 201120116View paper
Engineering Sciences (XE) 201020106View paper
Engineering Sciences (XE) 200920095View paper
Engineering Sciences (XE) 2008200810View paper
Engineering Sciences (XE) 200720076View paper

All Energy Balances for Closed Systems and Control Volumes previous year questions

Practice every matching question in batches of 20, with every available option.

1
2007 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2007
A rigid tank is connected through a valve to steam mains supplying steam at 1 MPa, 400°C. Heat is transferred from the tank to the surroundings, and the valve is closed when the total amount of cooling is 2000 kJ. The energy contained in the tank is the same before and after the process. Neglecting potential and kinetic energy changes, the mass of the steam that enters the tank is
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2
2007 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2007
Consider an ideal gas in a frictionless piston cylinder assembly. The weightless piston is initially loaded with a large number of small weights. How would you carry out a reversible isothermal expansion process? Assume that a large number of very small weights, and an arrangement for reversible heat transfer are available.
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3
2007 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2007
The work delivered by the engine is
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4
2007 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2007
The heat added is approximately
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5
2007 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2007
One kilogram of a perfect gas at 15°C and 100 kPa is heated to 45°C by (i) a constant pressure process and (ii) a constant volume process. \(c_p\) of the gas = 1.042 kJ/kg.K and \(R = 0.2968\) kJ/kg.K. Heat added in the constant pressure (\(Q_p\)) and constant volume (\(Q_v\)) processes are
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6
2007 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2007
Consider steady flow of air (c_p = 1005 J/kg.K) in an adiabatic passage. Air enters the passage at 100 kPa, 500 K at a velocity of 150 m/s and exits the passage at 510 K. Assume air to be an ideal gas and neglect gravitational effects. The passage is a
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7
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008

The work done in an isentropic process involving ideal gas is equal to

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8
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008

In a throttling process

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9
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
In a constant temperature process 70 moles of an ideal gas at temperature 354 K attains a final volume \( V_2 = 1\) m\(^3\). Work input during this process is 206 kJ. Initial volume \( V_1 \) of the gas approximately satisfies the following relation ( \( e \) is the base of natural logarithm)
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10
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
An ideal gas at pressure \( P_0 \) and temperature \( T_0 \) undergoes a reversible isothermal compression and attains a pressure \( P_1 \). The characteristic gas constant is \( R \). Net heat transferred during this process is
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11
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
A person starts a 60 W table fan in an insulated room of volume 86.4 m\(^3\). The person expects to cool the room from 32 \(^\circ\)C (pressure = 100 kPa) and allows the fan to rotate for 4 hours. If the specific heat at constant volume of the room air is 0.718 kJ/ kg K and characteristic gas constant is 287 J/ kg K, after 4 hours, the person will find that the room is
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12
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
Two kg of air at 500 kPa and 370 K expands adiabatically in a closed system until its volume is doubled and its pressure and temperature become equal to that of the surroundings, which is at 100 kPa and 300 K. If for air, Cᵥ = 0.7 kJ/kg K and the characteristic gas constant R = 0.287 kJ/kg K, the maximum work for this process is approximately given by
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13
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
Statement for Linked Answer Questions 31 and 32:
A tank contains 9kg of liquid water at an initial temperature $T_0^\circ C$. A coil removes heat at the rate of $\dot{Q}=k_1T$ from the tank. A paddle wheel, by constantly stirring, maintains uniform temperature in the tank. The rate of work input through the paddle wheel is $\dot{W}=k_2T$. Temperature, $T$ is in degree centigrade and $k_1$ & $k_2$ are constants. (Note that the rate of change in internal energy inside the tank will be a balance of work and heat transfer rates.)
Temperature of the tank will vary in such a way that
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14
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
If $T_0=80^\circ C$, $|k_1|=0.1$, $|k_2|=0.01$ and specific heat of the liquid = 1.0, the temperature of the tank after 1 minute will be
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15
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
Statement for Linked Answer Questions 33 and 34:
Air enters a gas turbine at 1.0135 MPa, 1000 K at the rate of 1 kg/s and exits at 101.35 kPa and 600 K. Neglect the changes in potential energy and kinetic energy and assume that air is an ideal gas with R = 0.287 kJ/kg K, $c_p=1.005$ kJ/kg K.
The net power output of the gas turbine is
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16
2008 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2008
A liquid having mass \( M \) (kg), heat capacity \( C_p \) (J.kg-1.°C-1) is cooled in an agitated vessel having surface area \( A \) (m2). A cooling medium at temperature \( T_s \) (°C) is used for cooling the liquid. The differential equation governing the temperature change \( dT/dθ \) of liquid with overall heat transfer coefficient \( U \) (W.m-2.°C-1) for the vessel is given by
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17
2009 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2009
For an ideal gas undergoing a throttling process 1-2, which of the following relationships holds ?
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18
2009 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2009
Saturated liquid water at 0.4 MPa and 1000 kg/hr of steam at 0.4 MPa and 300 °C enter steadily into an insulated mixing chamber. At 0.4 MPa, the enthalpy of saturated liquid and saturated vapour are 604.73 and 2738.53 kJ/kg respectively; also, the enthalpy of superheated steam at 300 °C is 3066.75 kJ/kg. The quality of the water-vapour mixture exiting the chamber is 0.9. The mass flow rate of saturated liquid water in kg/hr is
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19
2009 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2009

The work done by nitrogen in kJ during the process is

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20
2009 · Engineering Sciences · First Law of Thermodynamics · Energy Balances for Closed Systems and Control Volumes
Engineering Sciences (XE) 2009
An ideal gas ($\gamma = 1.39$) flows in a pipeline at 450 °C and 20 bar. A rigid, insulated and initially evacuated vessel is connected to the pipeline through a valve. The valve is now opened and the gas is allowed to fill the empty vessel. The final temperature of the gas in the vessel is
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Showing 20 of 110 questions