MCQs


MCQs

Law of Parallelogram of Forces : 5 in 5 MCQs S01-E01

Consider two forces P and Q acting simultaneously on a particle O as shown in the figure above. Let the angle between these two forces

5 Solved MCQs
Law of Parallelogram of Forces : 5 in 5 MCQs S01-E01
7 min read

Balancing


Balancing

Variation of Tractive Force | Tractive Effort | Effect of Partial Balancing of Locomotives

We will study the effect of variation of tractive force and also derive the equation to calculate the the tractive force. The first thing to remember here is that, the Locomotive engines are reciprocating engines

Variation of Tractive Force | Tractive Effort | Effect of Partial Balancing of Locomotives
5 min read
Balancing of V-Engines

A V-engine is a two cylinder engine, which has a common crank and the axis of cylinder makes a "V" shape. Since V-engines have a common crank and the crank revolves in one plane, there is no primary or secondary couple acting on the engine.

Balancing of V-Engines
8 min read
Concept of Direct and Reverse Crank for V-engines & Radial engines

The method of direct and reverse cranks is applicable on reciprocating engines i.e V engines, radial engines, etc in which the piston performs reciprocating motion.

Concept of Direct and Reverse Crank for V-engines & Radial engines
5 min read
Static and Dynamic Balancing

The method of direct and reverse cranks is applicable on reciprocating engines i.e V engines, radial engines, etc in which the piston performs reciprocating motion.

Static and Dynamic Balancing
2 min read
Multi Cylinder Inline Engine (with firing order) | Numerical

Basic knowledge about Firing Order - The firing order is a sequence of giving spark/firing to the cylinders of multi-cylinder inline engines. Firing order is provided in multi-cylinder inline engines in order to avoid vibrations

Numerical
Multi Cylinder Inline Engine (with firing order) | Numerical
5 min read

Vibration


Vibration

Critically Damped System (ξ = 1)

Critically damped system(ξ=1): If the damping factor `ξ` is equal to one, or the damping coefficient `c` is equal to critical damping coefficient, then the system is said to be a critically damped system

Derivation
Critically Damped System (ξ = 1)
2 min read
Damped free Vibration - Numerical 1

A mass of 85 kg is supported on a spring which deflects 18 mm under the weight of the mass. The vibrations of the mass are constrained to be linear and vertical. A dashpot is provided which reduces the amplitude to one-quarter of its initial value in two complete oscillations. Calculate magnitude of the damping force at unit velocity and periodic time of damped vibration.

Numerical
Damped free Vibration - Numerical 1
3 min read
Damped free Vibration - Numerical 2

The disc of a torsional pendulum has a moment of inertia of 600 kg cm² and is immersed in viscous fluid. The brass shaft attached to it is of

Numerical
Damped free Vibration - Numerical 2
4 min read
Damped free Vibration - Numerical 4

Numerical: A door along with door-closing system shown is shown in the figure below. It has a moment of inertia of $25 kg sdot m^2$ about the hinge axis. If the stiffness of torsional spring is $20 N m/rad$, find the most suitable value of the damping coefficient.

Numerical
Damped free Vibration - Numerical 4
2 min read
Logarithmic Decrement (​δ)

Logarithmic decrement is defined as the natural logarithm of the ratio of successive amplitude on the same side of mean position. The rate of decay in the amplitudes of under-damped system is measured by the parameter known as logarithmic decrement.

Derivation
Logarithmic Decrement (​δ)
4 min read
Over-Damped System (​ξ>1)

We know that the characteristic equation of the damped free vibration system is, mS^2 + cS + K = 0. This is a quadratic equation having two roots S1 and S2

Derivation
Over-Damped System (​ξ>1)
7 min read
Under-Damped System (​ξ < 1)

Under damped system (ξ < 1) If the damping factor ξ is less than one or the damping coefficient c is less than critical damping coefficient, then the system is said to be an under-damped system.

Derivation
Under-Damped System (​ξ < 1)
3 min read