# Engineering Mechanics Viva Questions

• What is engineering mechanics?
• What are the fundamental principles of mechanics?
• What is a force and how is it measured?
• What is a moment and how is it measured?
• What is a couple and how is it measured?
• What is a free body diagram and how is it used?
• What is equilibrium and how do you determine if a body is in equilibrium?
• What are the different types of supports and how do they affect the equilibrium of a structure?
• What is a truss and how do you analyze it?
• What is a beam and how do you analyze it?
• What is a frame and how do you analyze it?
• What is stress and how is it calculated?
• What is strain and how is it calculated?
• What is the difference between tensile and compressive stress?
• What is the modulus of elasticity?
• What is Hooke’s law?
• What is the principle of superposition?
• What is a Mohr’s circle?
• What is the difference between a statically determinate and statically indeterminate structure?
• What is the method of joints and how is it used to analyze trusses?
• What is the method of sections and how is it used to analyze trusses?
• What is the bending moment and how is it calculated?
• What is the shear force and how is it calculated?
• What is the shear stress and how is it calculated?
• What is the difference between bending and shear stress?
• What is the second moment of area and how is it calculated?
• What is the maximum stress theory?
• What is the maximum strain theory?
• What is the distortion energy theory?
• What is the difference between a beam and a column?
• What is the Euler buckling load and how is it calculated?
• What is the difference between a pin joint and a fixed joint?
• What is the difference between a cantilever beam and a simply supported beam?
• What is the difference between a concentrated load and a distributed load?
• What is the difference between a statically determinate and statically indeterminate beam?
• What is a moment of inertia and how is it calculated?
• What is the principle of virtual work?
• What is the difference between a kinematic and kinetic analysis?
• What is the difference between a conservative and non-conservative force?
• What is the difference between a scalar and vector quantity?
• What is the law of conservation of momentum?
• What is the difference between linear and angular momentum?
• What is the principle of impulse and momentum?
• What is the difference between elastic and inelastic collisions?
• What is the difference between a static and dynamic equilibrium?
• What is the center of mass and how is it calculated?
• What is the principle of work and energy?
• What is the difference between potential and kinetic energy?
• What is the principle of conservation of energy?
• What is the difference between a machine and a structure?
• What is the difference between an ideal and actual machine?
• What is a gear train and how does it work?
• What is a cam and how does it work?
• What is a flywheel and how does it work?
• What is a belt drive and how does it work?
• What is the difference between static and kinetic friction?
• What is the difference between a coefficient of friction and angle of friction?
• What is the principle of moment of momentum?
• What is the difference between laminar and turbulent flow?
• What is the Bernoulli’s equation and how is it applied in fluid mechanics?
• What is the difference between a laminar and turbulent boundary layer?
• What is the Reynolds number and how is it calculated?
• What is the difference between a closed and open system?
• What is the difference between a compressible and incompressible flow?
• What is the difference between a one-dimensional and two-dimensional flow?
• What is the difference between a hydraulic and pneumatic system?
• What is Pascal’s law?
• What is the difference between gauge pressure and absolute pressure?
• What is the difference between a centrifugal and positive displacement pump?
• What is the difference between a nozzle and diffuser?
• What is the difference between a laminar and turbulent jet?
• What is the difference between a boundary layer and wake?
• What is the difference between a vortex and eddy?
• What is the difference between laminar and turbulent boundary layer separation?
• What is the difference between a velocity and acceleration field?
• What is the principle of continuity in fluid mechanics?
• What is the principle of conservation of mass in fluid mechanics?
• What is the principle of conservation of momentum in fluid mechanics?
• What is the principle of conservation of energy in fluid mechanics?
• What is the difference between a laminar and turbulent flow in a pipe?
• What is the difference between a laminar and turbulent flow in a channel?
• What is the difference between a laminar and turbulent flow in a boundary layer?
• What is the difference between a converging and diverging nozzle?
• What is the difference between a subsonic and supersonic flow?
• What is the Mach number and how is it calculated?
• What is the difference between a hydraulic and electric actuator?
• What is the difference between a hydraulic and electric brake?
• What is the difference between a hydraulic and electric motor?
• What is the difference between a hydraulic and electric pump?
• What is the difference between a hydraulic and electric valve?
• What is the difference between a flow control valve and pressure control valve?
• What is the difference between a proportional and on-off control valve?
• What is the difference between a hydraulic accumulator and filter?
• What is the difference between a hydraulic cylinder and motor?
• What is the difference between a hydraulic hose and tube?
• What is the difference between a hydraulic power unit and system?
• What is the difference between a hydraulic reservoir and tank?
• What is the difference between a hydraulic schematic and diagram?
• What is the difference between a hydraulic symbol and drawing?
• What is the difference between a hydraulic and pneumatic cylinder?
• What is the difference between a hydraulic and pneumatic motor?
• What is the difference between a hydraulic and pneumatic pump?
• What is the difference between a hydraulic and pneumatic system?
• What is the difference between a hydraulic and pneumatic valve?
• What is the difference between a pressure and flow control valve?
• What is the difference between a proportional and servo valve?
• What is the difference between a hydraulic and pneumatic accumulator?
• What is the difference between a hydraulic and pneumatic filter?
• What is the difference between a hydraulic and pneumatic hose?
• What is the difference between a hydraulic and pneumatic power unit?
• What is the difference between a hydraulic and pneumatic reservoir?
• What is the difference between a hydraulic and pneumatic schematic?
• What is the difference between a hydraulic and pneumatic symbol?
• What is the difference between a hydraulic and pneumatic drawing?
• What is the difference between a hydraulic and pneumatic cylinder?
• What is the difference between a hydraulic and pneumatic motor?
• What is the difference between a hydraulic and pneumatic pump?
• What is the difference between a hydraulic and pneumatic system?
• What is the difference between a hydraulic and pneumatic valve?
• What is a heat exchanger and how does it work?
• What is the difference between a shell-and-tube and plate heat exchanger?
• What is the difference between a cross-flow and counter-flow heat exchanger?
• What is the difference between a single-pass and multi-pass heat exchanger?
• What is the difference between a co-current and counter-current heat exchanger?
• What is the difference between a parallel and series heat exchanger?
• What is the difference between a sensible and latent heat transfer?
• What is the difference between a conduction and convection heat transfer?
• What is the difference between a radiation and convection heat transfer?
• What is the difference between a steady-state and transient heat transfer?
• What is the difference between a heat flux and temperature gradient?
• What is the difference between a thermocouple and RTD sensor?
• What is the difference between a thermistor and thermocouple sensor?
• What is the difference between a thermocouple and thermistor sensor?
• What is the difference between a thermocouple and RTD sensor?
• What is the difference between a thermistor and RTD sensor?
• What is the difference between a single and dual-point calibration?
• What is the difference between a contact and non-contact temperature measurement?
• What is the difference between an isothermal and adiabatic process?
• What is the difference between an isobaric and isochoric process?
• What is the difference between an isothermal and isochoric process?
• What is the difference between an isentropic and adiabatic process?
• What is the difference between a closed and open system in thermodynamics?
• What is the difference between a steady-state and transient system in thermodynamics?
• What is the difference between a reversible and irreversible process in thermodynamics?
• What is the difference between a work and heat transfer in thermodynamics?
• What is the difference between a first and second law of thermodynamics?
• What is the difference between an internal and external combustion engine?
• What is the difference between a petrol and diesel engine?
• What is the difference between a four-stroke and two-stroke engine?
• What is the difference between a reciprocating and rotary engine?
• What is the difference between a spark-ignition and compression-ignition engine?
• What is the difference between a supercharger and turbocharger?
• What is the difference between a carburetor and fuel injection system?
• What is the difference between a camshaft and crankshaft?
• What is the difference between a governor and flywheel?
• What is the difference between a radiator and intercooler?
• What is the difference between a shaft and axle?
• What is the difference between a strut and tie rod?
• What is the difference between a stud and bolt?
• What is the difference between tensile and compressive stress?
• What is the difference between shear and bending stress?
• What is the difference between ductile and brittle materials?
• What is the difference between yield strength and ultimate strength?
• What is the difference between stress and strain?
• What is the difference between modulus of elasticity and modulus of rigidity?
• What is the difference between Hooke’s law and Poisson’s ratio?
• What is the difference between isotropic and anisotropic materials?
• What is the difference between a simple and compound beam?
• What is the difference between a statically determinate and indeterminate beam?
• What is the difference between a fixed and simply supported beam?
• What is the difference between a cantilever and overhanging beam?
• What is the difference between a propped and continuous beam?
• What is the difference between a point and distributed load on a beam?
• What is the difference between a concentrated and distributed load on a beam?
• What is the difference between a uniformly distributed and varying load on a beam?
• What is the difference between a positive and negative moment on a beam?
• What is the difference between a neutral axis and centroid of a beam?
• What is the difference between a section modulus and moment of inertia?
• What is the difference between a structural steel and aluminum beam?
• What is the difference between a truss and frame structure?
• What is the difference between a pin joint and rigid joint in a truss?
• What is the difference between a tension and compression member in a truss?
• What is the difference between a chord and web in a truss?
• What is the difference between a statically determinate and indeterminate truss?
• What is the difference between a simple and compound truss?
• What is the difference between a Howe and Pratt truss?
• What is the difference between a space and planar truss?
• What is the difference between a beam and plate element in Finite Element Analysis?
• What is the difference between a tetrahedron and hexahedron element in Finite Element Analysis?
• What is the difference between a mesh and grid in Finite Element Analysis?
• What is the difference between a linear and nonlinear analysis in Finite Element Analysis?
• What is the difference between a static and dynamic analysis in Finite Element Analysis?
• What is the difference between a transient and steady-state analysis in Finite Element Analysis?
• What is the difference between a stiffness and mass matrix in Finite Element Analysis?
• What is the difference between a displacement and stress analysis in Finite Element Analysis?
• What is the difference between a 2D and 3D analysis in Finite Element Analysis?
• What is the difference between a laminar and turbulent flow?
• What is the difference between a Newtonian and non-Newtonian fluid?
• What is the difference between a pressure and velocity boundary condition in fluid mechanics?
• What is the difference between a streamline and pathline in fluid mechanics?
• What is the difference between a control volume and control surface in fluid mechanics?
• What is the difference between a stagnation point and separation point in fluid mechanics?
• What is the difference between a laminar and turbulent boundary layer?
• What is the difference between a hydraulic and pneumatic system?
• What is the difference between a reciprocating and centrifugal pump?
• What is the difference between a positive displacement and dynamic compressor?
• What is the difference between a single-stage and multi-stage compressor?
• What is the difference between a nozzle and diffuser in fluid mechanics?
• What is the difference between a Francis and Pelton turbine?
• What is the difference between a single and double effect evaporator?
• What is the difference between a parallel and counterflow heat exchanger?
• What is the difference between a condenser and evaporator in refrigeration?
• What is the difference between a single and double pipe heat exchanger?
• What is the difference between a shell and tube heat exchanger and plate heat exchanger?
• What is the difference between a sensible and latent heat transfer?
• What is the difference between thermal conductivity and thermal diffusivity?
• What is the difference between conduction, convection, and radiation heat transfer?
• What is the difference between a thermocouple and resistance temperature detector?
• What is the difference between a positive and negative feedback system in control engineering?
• What is the difference between a proportional, integral, and derivative controller?
• What is the difference between a feedback and feedforward control system?
• What is the difference between a time and frequency domain in control engineering?
• What is the difference between a stable and unstable system in control engineering?
• What is the difference between an open-loop and closed-loop control system?
• What is the difference between a lead and lag compensator in control engineering?
• What is the difference between a dead time and time constant in control engineering?
• What is the difference between a mechanical and electrical system?
• What is the difference between a linear and nonlinear system?
• What is the difference between a lumped and distributed system?
• What is the difference between a deterministic and stochastic system?
• What is the difference between a discrete and continuous system?
• What is the difference between a feedback and feedforward system in control engineering?
• What is the difference between a time and frequency domain in control engineering?
• What is the difference between a proportional, integral, and derivative controller in control engineering?
• What is the difference between a stable and unstable system in control engineering?
• What is the difference between an open-loop and closed-loop system in control engineering?
• What is the difference between a lead and lag compensator in control engineering?
• What is the difference between a dead time and time constant in control engineering?
• What is the difference between an actuator and sensor in control engineering?
• What is the difference between a position and velocity sensor?
• What is the difference between a linear and rotary actuator?
• What is the difference between an analog and digital signal?
• What is the difference between a binary and decimal number system?
• What is the difference between an AC and DC voltage signal?
• What is the difference between an op-amp and comparator?
• What is the difference between a microcontroller and microprocessor?
• What is the difference between RAM and ROM memory?
• What is the difference between a single-phase
• What is the difference between an induction and synchronous motor?
• What is the difference between a series and parallel circuit?
• What is the difference between a diode and transistor?
• What is the difference between an insulator and conductor?
• What is the difference between a magnetic and electric field?
• What is the difference between a scalar and vector quantity in physics?
• What is the difference between a force and torque in mechanics?
• What is the difference between mass and weight?
• What is the difference between velocity and acceleration?
• What is the difference between work and power in mechanics?
• What is the difference between static and dynamic friction?
• What is the difference between elastic and plastic deformation?
• What is the difference between stress and strain?
• What is the difference between a beam and column in structural mechanics?
• What is the difference between an axial and bending load?
• What is the difference between a compression and tension load?
• What is the difference between a truss and frame in structural mechanics?
• What is the difference between a cantilever and simply supported beam?
• What is the difference between a moment and torque in mechanics?
• What is the difference between a shear and moment diagram in mechanics?
• What is the difference between an impulse and momentum in mechanics?
• What is the difference between a free body diagram and shear/moment diagram in mechanics?
• What is the difference between a closed and open system in thermodynamics?
• What is the difference between a reversible and irreversible process in thermodynamics?
• What is the difference between an isothermal and adiabatic process in thermodynamics?
• What is the difference between a state and path function in thermodynamics?
• What is the difference between internal energy and enthalpy in thermodynamics?
• What is the difference between heat and temperature?
• What is the difference between a thermodynamic cycle and process?
• What is the difference between the first and second law of thermodynamics?
• What is the difference between a Carnot and Rankine cycle in thermodynamics?
• What is the difference between a heat engine and heat pump?
• What is the difference between a vapor and gas in thermodynamics?
• What is the difference between a saturated and superheated vapor in thermodynamics?
• What is the difference between a compressor and turbine in thermodynamics?
• What is the difference between a throttle and expansion valve in thermodynamics?
• What is the difference between a single and double-stage compressor in thermodynamics?
• What is the difference between a condenser and evaporator in thermodynamics?
• What is the difference between a subcooled and superheated liquid in thermodynamics?
• What is the difference between a power cycle and refrigeration cycle in thermodynamics?
• What is the difference between an adiabatic and isentropic process in thermodynamics?
• What is the difference between a heat transfer coefficient and heat flux in thermodynamics?
• What is the difference between a heat sink and heat source in thermodynamics?
• What is the difference between a thermal and electrical conductivity?
• What is the difference between a steady and unsteady flow in fluid mechanics?
• What is the difference between a compressible and incompressible flow in fluid mechanics?
• What is the difference between a laminar and turbulent flow in fluid mechanics?
• What is the difference between a boundary layer and wake in fluid mechanics?
• What is the difference between a streamline and streakline in fluid mechanics?
• What is the difference between a flow rate and velocity in fluid mechanics?