# Engineering Mechanics Viva Questions

• What is the difference between statics and dynamics in engineering mechanics?
• Define force and its units.
• What is the principle of superposition of forces?
• What is the difference between a scalar and a vector quantity? Give examples.
• Explain the concept of moment of a force and its units.
• State the conditions of equilibrium for a rigid body.
• What is a couple? How does it differ from a force?
• Define the term ‘friction’ and explain the different types of friction.

• What is the law of conservation of energy?
• What is the difference between elastic and inelastic collisions?
• Explain the concept of work and energy.
• What is meant by the term ‘center of mass’?
• What is the difference between centroid and center of mass?
• Explain the concept of torque and its relationship with angular acceleration.
• What is meant by the term ‘moment of inertia’?
• State the law of conservation of momentum and its significance.
• Explain the concept of projectile motion.
• What is Hooke’s law?

• Explain the concept of stress and strain.
• What is the difference between tensile and compressive stress?
• Explain the concept of shear stress and its applications.
• Define modulus of elasticity and its units.
• What is the Poisson’s ratio? How is it calculated?
• What is the difference between a beam and a column?
• Explain the concept of bending moment and shear force in a beam.
• What is the difference between a scalar and a vector quantity? Give examples.

• Explain the concept of moment of a force and its units.
• State the conditions of equilibrium for a rigid body.
• What is a couple? How does it differ from a force?
• Define the term ‘friction’ and explain the different types of friction.
• What is the law of conservation of energy?
• What is the difference between elastic and inelastic collisions?
• Explain the concept of work and energy.
• What is meant by the term ‘center of mass’?
• What is the difference between centroid and center of mass?
• Explain the concept of torque and its relationship with angular acceleration.
• What is meant by the term ‘moment of inertia’?
• State the law of conservation of momentum and its significance.
• Explain the concept of projectile motion.
• What is Hooke’s law?
• Explain the concept of stress and strain.
• What is the difference between tensile and compressive stress?
• Explain the concept of shear stress and its applications.
• Define modulus of elasticity and its units.
• What is the Poisson’s ratio? How is it calculated?
• What is the difference between a beam and a column?
• Explain the concept of bending moment and shear force in a beam.

• What is the difference between a statically determinate and indeterminate structure?
• What is the difference between a truss and a frame?
• Define the term ‘deflection’ and its units.
• What is the relationship between load, bending moment, and deflection in a beam?
• What is the difference between a concentrated and a distributed load?
• What is the principle of virtual work?
• What is the difference between a cantilever and a simply supported beam?
• What is the difference between a rigid and a deformable body?
• Define the term ‘moment’ and its units.
• What is the principle of virtual work and how is it used in engineering mechanics?

• What is the difference between static and dynamic equilibrium?
• What is a free-body diagram?
• What is the difference between a scalar and a vector quantity?
• Explain the concept of a force vector and its components.
• What is the difference between a force and a torque?
• Define the term ‘moment arm’ and how it is related to torque.
• Explain the concept of a couple and how it differs from a single force.

• What is the difference between kinetic and potential energy?
• What is the work-energy principle?
• What is the difference between a conservative and a non-conservative force?
• What is the law of conservation of energy and how is it used in engineering mechanics?
• What is the difference between an elastic and an inelastic material?

• Define the term ‘strain’ and its units.
• Explain the concept of stress and its units.
• What is the difference between tensile and compressive stress?
• What is the difference between shear stress and normal stress?
• What is the difference between a beam and a cantilever?
• Explain the concept of beam bending and how it is related to bending moment.
• What is the difference between a simply supported and a fixed beam?

• Define the term ‘deflection’ and its units.
• Explain the concept of thermal stress and how it is calculated.
• What is the difference between a reversible and an irreversible process in thermodynamics?
• What is entropy and how is it related to the second law of thermodynamics?
• What is the Carnot cycle and why is it important in thermodynamics?

• What is the difference between a heat engine and a heat pump?
• Define the term ‘heat transfer’ and its units.
• What is the difference between work and power?
• What is the difference between a conservative and a non-conservative force?
• What is the difference between an elastic and an inelastic material?
• Explain the concept of strain energy and its importance in engineering mechanics.
• What is the difference between a truss and a frame?
• What is the difference between a statically determinate and indeterminate structure?

• What is the difference between a concentrated and a distributed load?
• What is the difference between a cantilever and a simply supported beam?
• What is the difference between a closed and an open system in thermodynamics?
• What is the difference between a heat engine and a heat pump?
• What is the difference between conduction and convection heat transfer?
• What is the difference between shear stress and tensile stress?
• Explain the concept of thermal expansion and how it is related to temperature change.
• What is Hooke’s law and how is it applied in engineering mechanics?

• Define the term ‘yield strength’ and its units.
• What is the difference between ultimate strength and yield strength?
• What is the difference between ductile and brittle materials?
• What is the difference between strain and deformation?
• Define the term ‘stress concentration’ and its causes.
• What is the difference between a bending moment and a twisting moment?
• What is the difference between a centroid and a center of gravity?
• What is the difference between a static and a dynamic load?
• Explain the concept of a stress-strain curve and its importance in material testing.

• What is the difference between a tensile and a compressive load?
• What is the difference between a strain gauge and a load cell?
• Define the term ‘fatigue failure’ and its causes.
• What is the difference between a bolt and a screw?
• What is the difference between a beam and a column?
• Explain the concept of a statically determinate structure and give an example.
• What is the difference between an internal and an external force?
• Define the term ‘couple moment’ and its importance in structural analysis.
• What is the difference between a statically indeterminate and determinate structure?

• What is the difference between a beam and a truss?
• What is the difference between a pinned and a fixed support?
• What is the difference between a reaction force and a shear force?
• Define the term ‘deflection’ and its importance in structural analysis.
• What is the difference between a moment of inertia and a second moment of area?
• What is the difference between a statically determinate and indeterminate beam?
• What is the difference between a continuous and a simple beam?
• Explain the concept of an eccentric load and its effects on a structure.

• Define the term ‘torsion’ and its units.
• What is the difference between a shear force and a bending moment?
• What is the difference between a simply supported and a cantilever beam?
• What is the difference between a tension and compression member in a truss?
• What is the difference between a concentrated and a distributed load on a beam?
• Explain the concept of an influence line and its use in structural analysis.

• What is the difference between a concentrated and a distributed load on a truss member?
• What is the difference between a force and a pressure?
• Define the term ‘bulk modulus’ and its units.
• What is the difference between a shear modulus and a Young’s modulus?
• What is the difference between a torsional shear stress and a bending shear stress?
• What is the difference between a beam and a plate?
• Explain the concept of a plate bending and its relation to bending moment.
• What is the difference between a simply supported and a fixed plate?

• What is the difference between a rectangular and a circular plate?
• Define the term ‘principal stress’ and its importance in structural analysis.
• What is the difference between a stress and a strain?
• What is the difference between a moment and a torque?
• Define the term ‘shear flow’ and its importance in beam design.
• What is the difference between a statically determinate and indeterminate frame?