# Test Bank For Thermodynamics An Engineering Approach 8Th edition By SI Units

Test Bank For Thermodynamics An Engineering Approach 8Th edition By SI Units is an invaluable study resource for anyone studying thermodynamics. It includes a range of exhaustive practice exercises and questions, all in the standard International System of Units (SI).

Test Bank provides detailed explanations for each answer, helping users understand thermodynamic principles better. Furthermore, tools such as tutorials and periodic quizzes help reinforce concepts by providing an interactive learning experience. Test Bank is a useful tool for both beginners and experts alike, allowing users to effectively track their progress as they work through more difficult topics.

ISBN-13: 978-9339221652 ISBN-10: 9339221656

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## Test Bank For Thermodynamics An Engineering Approach 8Th edition By SI Units

Test Bank for Thermodynamics: An Engineering Approach, 8th edition by Yunus A. Cengel and Michael A. Boles, provides students with a comprehensive and thorough understanding of thermodynamics, and how it is applied in engineering. The textbook covers the fundamental principles of thermodynamics, including energy, work, heat, and the laws of thermodynamics. It also explores topics such as thermodynamic cycles, thermodynamic property relations, and mixtures of gases and vapors. The Test Bank includes a range of questions and exercises that help students to develop their understanding of thermodynamics and to apply it to real-world engineering problems. The Test Bank is an essential resource for instructors teaching courses on thermodynamics at the undergraduate level.

Multiple-Choice Test Problems

Chapter 2:  Energy, Energy Transfer, and General Energy Analysis

Çengel/Boles – Thermodynamics: An Engineering Approach, 8th Edition

(Numerical values for solutions can be obtained by copying the EES solutions given and pasting them on a blank EES screen, and pressing the Solve command. Similar problems and their solutions can be obtained easily by modifying numerical values.)

Chap2-1 Heating by Resistance Heater

A 1.5-kW electric resistance heater in a room is turned on and kept on for 20 min. The amount of energy transferred to the room by the heater is

(a) 1.5 kJ (b) 60 kJ (c) 750 kJ (d) 1800 kJ (e) 3600 kJ

Solution Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen.

We= 1.5 “kJ/s”

time=20*60 “s”

E_total=We*time “kJ”

“Some Wrong Solutions with Common Mistakes:”

W1_Etotal=We*time/60 “using minutes instead of s”

W2_Etotal=We “ignoring time”

Chap2-2 Heat Supplied by Vacuum Cleaner

A 200 W vacuum cleaner is powered by an electric motor whose efficiency is 70%. (Note that the electric motor delivers 200 W of net mechanical power to the fan of the cleaner). The rate at which this vacuum cleaner supplies energy to the room when running is

(a) 140 W  (b) 200 W   (c)  286 W  (d) 360 W (e) 86 W

Solution Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen.

Eff=0.70

W_vac=0.2 “kW”

E=W_vac/Eff  “kJ/s”

“Some Wrong Solutions with Common Mistakes:”

W1_E=W_vac*Eff “Multiplying by efficiency”

W2_E=W_vac “Ignoring efficiency”

W3_E=E-W_vac “Heat generated by the motor”

Chap2-3 Heat Convection

A 40-cm-long, 0.6-cm-diameter electric resistance wire is used to determine the convection heat transfer coefficient in air at 25C experimentally. The surface temperature of the wire is measured to be 150C when the electric power consumption is 90 W. If the radiation heat loss from the wire is calculated to be 30 W, the convection heat transfer coefficient is

(a)  0.48 W/m2.C (b) 127 W/m2.C (c) 63.7 W/m2.C (d) 95 W/m2.C (e) 200 W/m2.C “

Solution Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen.

L=0.4 “m”

D=0.006 “m”

A=pi*D*L “m^2”

We=90 “W”

Ts=150 “C”

Tf=25 “C”

We-30= h*A*(Ts-Tf) “W”

“Some Wrong Solutions with Common Mistakes:”

We-30= W1_h*(Ts-Tf) “Not using area”

We-30= W2_h*(L*D)*(Ts-Tf) “Using D*L for area”

A 1.5-m2 black surface at 120C is losing heat to the surrounding air at 30C by convection with a convection heat transfer coefficient of 18 W/m2.C, and by radiation to the surrounding surfaces at 10C. The total rate of heat loss from the surface is

(a) 1483 W (b) 2430 W (c) 2448 W (d) 3913 W (e) 2609 W

Solution Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen.

sigma=5.67E-8 “W/m^2.K^4”

eps=1

A=1.5 “m^2”

h_conv=18 “W/m^2.C”

Ts=120 “C”

Tf=30 “C”

Tsurr=10 “C”

Q_conv=h_conv*A*(Ts-Tf)  “W”

“Some Wrong Solutions with Common Mistakes:”

W3_Q=Q_conv eps*sigma*A*(Ts^4-Tsurr^4) “Using C in radiation calculations”

W4_Q=Q_total/A “not using area”

Chap2-5 Heat Conduction

Heat is transferred steadily through a 0.15-m thick 3 m by 5 m wall whose thermal conductivity is 1.2 W/m.C. The inner and outer surface temperatures of the wall are measured to be 18C to 4C. The rate of heat conduction through the wall is

(a) 112 W (b) 3360 W (c)  2640 W (d) 38 W (e) 1680 W

Solution Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen.

A=3*5 “m^2”

L=0.15 “m”

T1=18 “C”

T2=4 “C”

k=1.2  “W/m.C”

Q=k*A*(T1-T2)/L “W”

“Some Wrong Solutions with Common Mistakes:”

W1_Q=k*(T1-T2)/L “Not using area”

W2_Q=k*2*A*(T1-T2)/L  “Using areas of both surfaces”

W4_Q=k*A*L*(T1-T2) “Multiplying by thickness instead of dividing by it”

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Test Bank For Thermodynamics An Engineering Approach 8Th edition By SI Units is an invaluable study resource for anyone studying thermodynamics. It includes a range of exhaustive practice exercises and questions, all in the standard International System of Units (SI). Test Bank provides detailed explanations for each answer, helping users understand thermodynamic principles better. Furthermore, tools such as tutorials and periodic quizzes help reinforce concepts by providing an interactive learning experience. Test Bank is a useful tool for both beginners and experts alike, allowing users to effectively track their progress as they work through more difficult topics. Digital item No Waiting Time Instant Download ISBN-13: 978-9339221652 ISBN-10: 9339221656