All Categories MCQs
Topic Notes: All Categories
General Description
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
48971
What is the 'Diesel Cycle'?
Answer:
Constant pressure heat addition
The Diesel cycle is the thermodynamic cycle for diesel engines, characterized by heat addition at constant pressure.
48972
What is the 'Otto Cycle' used for?
Answer:
Petrol (Spark Ignition) Engines
The Otto cycle is the idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine (Petrol engine).
48973
What does Bernoulli's Principle state?
Answer:
An increase in the speed of a fluid occurs simultaneously with a decrease in static pressure
Bernoulli's principle states that for an inviscid flow of a non-conducting fluid, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
48974
What does the 'Reynolds Number' determine?
Answer:
Whether flow is laminar or turbulent
The Reynolds number is a dimensionless quantity used to predict flow patterns in different fluid flow situations (Laminar vs. Turbulent).
48975
What is 'Poisson's Ratio'?
Answer:
Ratio of lateral strain to longitudinal strain
Poisson's ratio is the negative ratio of transverse (lateral) strain to axial (longitudinal) strain.
48976
What is 'Young's Modulus'?
Answer:
Ratio of tensile stress to tensile strain
Young's Modulus (or Modulus of Elasticity) is a measure of the stiffness of a solid material, defined as the ratio of tensile stress to tensile strain.
48977
What does Hooke's Law state?
Answer:
Stress is directly proportional to Strain within the elastic limit
Hooke's Law states that for small deformations, the stress is directly proportional to the strain.
48978
What is 'Strain'?
Answer:
Deformation per unit length
Strain is the ratio of the change in dimension (deformation) to the original dimension of the material.
48979
What is 'Stress' in mechanics of materials?
Answer:
Force per unit area
Stress is defined as the internal restoring force per unit area of cross-section of the body.
48980
What does the Second Law of Thermodynamics state about entropy?
Answer:
Entropy of an isolated system always increases over time
The Second Law states that the total entropy of an isolated system can never decrease over time, implying that natural processes are irreversible.