BME Cheat Sheet 2026

The 30 highest-yield BME facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which of the following transfer functions represents a pure integrator? → K/s
2. Iron and carbon are the basic components of steels. Which of the aforementioned subgroups do they belong ? → Metallic Solid
3. For an ideal (inviscid, incompressible) fluid, Bernoulli's equation assumes which condition along a streamline? → Steady, incompressible, inviscid flow with no shaft work
4. A system's heat input and output are denoted by the symbols __ and ________, respectively. → positive, negative
5. A great refractory material is ceramic. A substance is referred to as refractory if it: → retains its strength at high temperatures
6. What does a high process capability index (Cpk > 1.67) indicate about a manufacturing process? → The process mean is well-centered and variation is well within specification limits
7. Which phase transformation occurs when austenite is rapidly quenched to form a body-centered tetragonal structure in steel? → Martensite formation
8. In fluid mechanics, the stagnation point is the location when the fluid's velocity is . → zero
9. Radial flow reaction turbines' primary components are . → All of the mentioned
10. Which type of stress is induced in a shaft subjected to twisting? → Shear stress
11. Which statement correctly describes the Joule-Thomson effect for an ideal gas? → Temperature remains unchanged during throttling
12. Which non-destructive testing method uses high-frequency sound waves to detect internal flaws in materials? → Ultrasonic testing
13. Which of the following best describes the fundamental tenet of fluid mechanics? → All of the mentioned
14. The Diesel cycle differs from the Otto cycle in that heat addition occurs at constant: → Pressure
15. The concept of 'stress triaxiality' is important in fracture mechanics because higher triaxiality: → Suppresses plastic flow and promotes brittle cleavage fracture
16. For a blackbody, the emissivity (ε) equals: → 1
17. For a type-1 feedback control system subjected to a unit ramp input r(t) = t, the steady-state error is: → 1/Kv, where Kv is the velocity error constant
18. There is some resistance to sliding between two bodies' surfaces when they come into touch; this is called . → Friction
19. In statistical process control (SPC), a process is considered 'out of control' when: → A data point falls outside the control limits or a non-random pattern is detected
20. In the finite element method, the stiffness matrix [K] relates nodal forces to nodal displacements via [K]{u} = {F}. The stiffness matrix is always: → Symmetric and positive semi-definite before boundary conditions are applied
21. For compressible flow in a converging-diverging nozzle, a normal shock wave can appear in the: → Diverging section at supersonic conditions
22. Which failure criterion is most appropriate for ductile metals under multiaxial loading? → von Mises (distortion energy) criterion
23. In ASME Y14.5 GD&T, the Maximum Material Condition (MMC) modifier means: → The feature contains the most material within its tolerances
24. In a just-in-time (JIT) production system, the kanban card primarily serves as a: → Signal to authorize production or material replenishment
25. Which parameter does NOT change when two geometrically similar pumps operate at homologous conditions? → Specific speed
26. In abrasive waterjet (AWJ) machining, the role of the abrasive particles is to: → Erode material through high-velocity impact and micro-cutting
27. Reynolds Transport Theorem relates the time rate of change of an extensive property in a: → Control volume to a system (material volume)
28. When does a fluid become laminar? → Conservation of linear momentum
29. What does fluid dynamics entail? → Study of fluid behaviour at rest and in motion
30. In hot forging, the workpiece is heated above its recrystallization temperature primarily to: → Reduce flow stress and improve ductility for easier deformation