The 30 kW Shaft That Needed 239 N·m of Torque
The shaft power was 30 kW at 1200 rpm. That meant about 239 N·m torque, not 30 N·m.
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FE EXAM · MECHANICAL
FE Mechanical Practice Questions
Practice FE-style Mechanical questions through interactive engineering problems with guided reasoning and detailed solutions.
Interactive problems•Reasoning explained•Solutions included
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QUESTION01
The 30 kW Shaft That Needed 239 N·m of Torque
The shaft power was 30 kW at 1200 rpm. That meant about 239 N·m torque, not 30 N·m.
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QUESTION02
The Thin-Wall Vessel That Saw 100 MPa Hoop Stress
At 2 MPa internal pressure, the vessel's hoop stress reached 100 MPa—twice the longitudinal stress.
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QUESTION03
The Spring That Deflected 25.6 mm Under 500 N
The spring force was 500 N, but the deflection depended strongly on wire diameter, coil diameter, and active coils.
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QUESTION04
The 50 mm Shaft That Saw 81.5 MPa of Shear
The torque was only 2 kN·m, but the outer surface of the 50 mm shaft reached about 81.5 MPa shear stress.
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QUESTION05
The Pump That Needed 14 kW to Deliver 9.81 kW to the Water
The water received 9.81 kW. A 70% efficient pump required about 14.0 kW of shaft input.
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QUESTION06
The 50 m Pipe That Lost 20 kPa
The velocity stayed at 2 m/s, yet wall friction consumed 20 kPa of pressure over the pipe length.
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QUESTION07
The Fast-Looking Oil Flow That Was Still Laminar
The oil was moving at 2 m/s, but its Reynolds number was only 1700.
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QUESTION08
The Refrigerator With a COP Greater Than One
The refrigerator removed 6 kW of heat using 2 kW of work. A COP of 3 was correct, not impossible.
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QUESTION09
The Turbine That Produced 1.2 MW From an Enthalpy Drop
The turbine power came from a 600 kJ/kg enthalpy drop, not from subtracting internal energies blindly.
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QUESTION10
The Sealed Tank That Reached 150 kPa, Not 133
The gas temperature rose from 300 K to 450 K. The pressure did not scale with Celsius temperature.
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How do I practice FE Mechanical questions?
Choose a topic, solve the problem before seeing the conclusion, and use the final reasoning trail to identify where your original assumption was supported or needed revision. The goal is not only to reach the answer, but to understand the engineering check behind it.