Where can I find the FE — Mechanical FE — Mechanical question paper 2025?

The full FE — Mechanical FE — Mechanical 2025 (Model questions) question paper is available free on Kekkei. You can read every question online and attempt the paper under timed exam conditions.

Does the FE — Mechanical 2025 paper come with solutions?

Yes. Every question on this FE — Mechanical past paper includes a step-by-step solution, plus instant AI feedback when you attempt it on Kekkei.

How many marks is the FE — Mechanical FE — Mechanical 2025 paper?

The FE — Mechanical FE — Mechanical 2025 paper carries 110 full marks and is meant to be completed in 360 minutes, across 10 questions.

Is practising this FE — Mechanical past paper free?

Yes — reading and attempting this FE — Mechanical past paper on Kekkei is completely free.

Reynolds number Re = v D for water ( = 1000 , = 10 -3 \, Pa s ) at v = 2\, m/s , D = 0.05\, m . The flow regime is:

Transitional ( 2300 < Re < 4000 )

FE — Mechanical FE — Mechanical Practice Test 2025

FE — MechanicalModel questions

110marks

360min

10questions

This is the official FE — Mechanical FE — Mechanical question paper for 2025, as set in the Model questions examination. It carries 110 full marks and a time allowance of 360 minutes, across 10 questions. On Kekkei you can attempt this FE — Mechanical past paper online with a timer, get instant AI feedback and step-by-step solutions, and track the topics where you lose marks — completely free. Whether you are revising for your FE — Mechanical FE — Mechanical exam or solving previous years' question papers, this 2025 paper is a great way to practise under real exam conditions.

Level	FE — Mechanical
Subject	FE — Mechanical
Year	2025 BS
Exam session	Model questions
Full marks	110
Time allowed	360 minutes
Questions	10, all with step-by-step solutions

Mechanical Engineering

Select the best answer.

10 questions·1 mark each

1Multiple choice1 mark

An ideal Carnot engine operates between $T_H = 800\,\text{K}$ and $T_C = 300\,\text{K}$ . The thermal efficiency is:

\eta = 1 - \frac{T_C}{T_H}

a
$37.5\%$
b
$50.0\%$
c
$62.5\%$
d
$75.0\%$

Correct answer: c

$62.5\%$

\eta = 1 - \frac{300}{800} = 0.625 = 62.5\%

thermodynamics

2Multiple choice1 mark

A plane wall: $L = 0.2\,\text{m}$ , $k = 50\,\text{W/(m\cdot K)}$ , $T_1 = 400\,\text{K}$ , $T_2 = 300\,\text{K}$ . Steady-state heat flux:

q'' = k \frac{T_1 - T_2}{L}

a
$10{,}000\,\text{W/m}^2$
b
$25{,}000\,\text{W/m}^2$
c
$50{,}000\,\text{W/m}^2$
d
$100{,}000\,\text{W/m}^2$

Correct answer: b

$25{,}000\,\text{W/m}^2$

q'' = 50 \times \frac{100}{0.2} = 25{,}000\,\text{W/m}^2

heat-transfer

3Multiple choice1 mark

Reynolds number $Re = \frac{\rho v D}{\mu}$ for water ( $\rho = 1000$ , $\mu = 10^{-3}\,\text{Pa\cdot s}$ ) at $v = 2\,\text{m/s}$ , $D = 0.05\,\text{m}$ . The flow regime is:

a
Laminar ( $Re < 2300$ )
b
Transitional ( $2300 < Re < 4000$ )
c
Turbulent ( $Re > 4000$ )
d
Turbulent ( $Re = 100{,}000$ )

Correct answer: d

Turbulent ( $Re = 100{,}000$ )

Re = \frac{1000 \times 2 \times 0.05}{10^{-3}} = 100{,}000 \gg 4{,}000

Fully turbulent flow.

fluid-mechanics

4Multiple choice1 mark

A truss member: $F = 50\,\text{kN}$ , $A = 500\,\text{mm}^2$ . Normal stress:

\sigma = \frac{F}{A}

a
$50\,\text{MPa}$
b
$100\,\text{MPa}$
c
$150\,\text{MPa}$
d
$200\,\text{MPa}$

Correct answer: b

$100\,\text{MPa}$

\sigma = \frac{50 \times 10^3}{500 \times 10^{-6}} = 100\,\text{MPa}

statics

5Multiple choice1 mark

A 10 kg block slides down a frictionless incline of height $h = 5\,\text{m}$ . Velocity at bottom ( $g = 9.81$ ):

v = \sqrt{2gh}

a
$7.0\,\text{m/s}$
b
$9.9\,\text{m/s}$
c
$14.0\,\text{m/s}$
d
$19.6\,\text{m/s}$

Correct answer: b

$9.9\,\text{m/s}$

v = \sqrt{2 \times 9.81 \times 5} = \sqrt{98.1} \approx 9.9\,\text{m/s}

dynamics

6Multiple choice1 mark

Steel rod: $E = 200\,\text{GPa}$ , $L = 2\,\text{m}$ , $A = 400\,\text{mm}^2$ , $P = 80\,\text{kN}$ . Elongation:

\delta = \frac{PL}{AE}

a
$1.0\,\text{mm}$
b
$2.0\,\text{mm}$
c
$4.0\,\text{mm}$
d
$8.0\,\text{mm}$

Correct answer: b

$2.0\,\text{mm}$

\delta = \frac{80{,}000 \times 2}{400 \times 10^{-6} \times 200 \times 10^9} = 0.002\,\text{m} = 2.0\,\text{mm}

materials

7Multiple choice1 mark

Shaft transmits $P = 10\,\text{kW}$ at $n = 1500\,\text{rpm}$ . Torque:

T = \frac{P}{2\pi n / 60}

a
$31.8\,\text{N\cdot m}$
b
$63.7\,\text{N\cdot m}$
c
$95.5\,\text{N\cdot m}$
d
$127.3\,\text{N\cdot m}$

Correct answer: b

$63.7\,\text{N\cdot m}$

T = \frac{10{,}000}{2\pi \times 1500/60} = \frac{10{,}000}{157.08} = 63.7\,\text{N\cdot m}

machine-design

8Multiple choice1 mark

Ideal gas isothermal expansion: $V_1 = 0.1\,\text{m}^3$ , $V_2 = 0.4\,\text{m}^3$ , $T = 300\,\text{K}$ , $n = 1\,\text{mol}$ , $R = 8.314$ . Work:

W = nRT \ln\frac{V_2}{V_1}

a
$1{,}729\,\text{J}$
b
$3{,}458\,\text{J}$
c
$4{,}988\,\text{J}$
d
$6{,}915\,\text{J}$

Correct answer: b

$3{,}458\,\text{J}$

W = 1 \times 8.314 \times 300 \times \ln 4 = 2494.2 \times 1.3863 = 3{,}458\,\text{J}

thermodynamics

9Multiple choice1 mark

Cylindrical fin: $d = 0.02\,\text{m}$ , $k = 400\,\text{W/(m\cdot K)}$ , $h = 20\,\text{W/(m}^2\text{\cdot K)}$ . Fin parameter:

m = \sqrt{\frac{4h}{kd}}

a
$2.24\,\text{m}^{-1}$
b
$3.16\,\text{m}^{-1}$
c
$4.47\,\text{m}^{-1}$
d
$6.32\,\text{m}^{-1}$

Correct answer: b

$3.16\,\text{m}^{-1}$

m = \sqrt{\frac{4 \times 20}{400 \times 0.02}} = \sqrt{\frac{80}{8}} = \sqrt{10} \approx 3.16\,\text{m}^{-1}

heat-transfer

10Multiple choice1 mark

Mercury manometer ( $\rho_m = 13{,}600$ ), water pipe ( $\rho_w = 1{,}000$ ), $\Delta h = 0.15\,\text{m}$ , $g = 9.81$ :

\Delta P = (\rho_m - \rho_w) g \Delta h

a
$10.4\,\text{kPa}$
b
$18.5\,\text{kPa}$
c
$20.0\,\text{kPa}$
d
$25.1\,\text{kPa}$

Correct answer: b

$18.5\,\text{kPa}$

\Delta P = 12{,}600 \times 9.81 \times 0.15 = 18{,}541\,\text{Pa} \approx 18.5\,\text{kPa}

fluid-mechanics

Frequently asked questions

Where can I find the FE — Mechanical FE — Mechanical question paper 2025?: The full FE — Mechanical FE — Mechanical 2025 (Model questions) question paper is available free on Kekkei. You can read every question online and attempt the paper under timed exam conditions.
Does the FE — Mechanical 2025 paper come with solutions?: Yes. Every question on this FE — Mechanical past paper includes a step-by-step solution, plus instant AI feedback when you attempt it on Kekkei.
How many marks is the FE — Mechanical FE — Mechanical 2025 paper?: The FE — Mechanical FE — Mechanical 2025 paper carries 110 full marks and is meant to be completed in 360 minutes, across 10 questions.
Is practising this FE — Mechanical past paper free?: Yes — reading and attempting this FE — Mechanical past paper on Kekkei is completely free.