Council of Scientific and Industrial Research Project Assistant Level 1 Interview Questions and Answers

3D refers to three-dimensional, which is a representation of objects or environments that have height, width, and depth.

• 3D is a term used to describe objects or environments that appear to have depth and dimension.

• It is a visual representation that adds depth to a flat surface, creating a more realistic and immersive experience.

• 3D can be achieved through various techniques such as stereoscopy, computer graphics, or hol...read more

There are several types of brakes including disc brakes, drum brakes, regenerative brakes, and hydraulic brakes.

• Disc brakes use calipers to squeeze brake pads against a disc rotor to slow down or stop the vehicle.

• Drum brakes use brake shoes that press against the inside of a drum to create friction and slow down or stop the vehicle.

• Regenerative brakes convert the kinetic energy of the vehicle into electrical energy, wh...read more

Engineering drawing is a visual representation of an object or structure, created using technical drawing techniques.

• Engineering drawing is used to communicate design and manufacturing information.

• It includes details such as dimensions, materials, and assembly instructions.

• Common types of engineering drawings include mechanical, electrical, and architectural drawings.

• Engineering drawings are typically created using CAD...read more

Gate valves are used to control the flow of fluids by opening or closing a gate. There are several types of gate valves.

• Rising stem gate valve

• Non-rising stem gate valve

• Wedge gate valve

• Parallel gate valve

• Knife gate valve

• Slab gate valve

The two types of cooling towers are natural draft cooling towers and mechanical draft cooling towers.

• Natural draft cooling towers use natural air circulation to cool the water, with no mechanical fans.

• Mechanical draft cooling towers use mechanical fans to circulate air and cool the water.

• Examples of natural draft cooling towers include hyperbolic cooling towers, while examples of mechanical draft cooling towers include...read more

A perfect gas is an idealized model of a gas that meets certain conditions.

• The gas consists of a large number of tiny particles that are in constant random motion.

• The particles are assumed to have no volume.

• The particles do not interact with each other except through perfectly elastic collisions.

• The gas is assumed to be in a closed container.

• The temperature, pressure, and volume of the gas are related by the ideal gas ...read more

The vital conditions of a perfect gas are state equation and constant specific heat.

• Perfect gas must satisfy state equation

• Specific heat should remain constant

• Examples: Ideal gas, real gas at low pressure and high temperature

Torque is a measure of the twisting force that causes rotation.

• Torque is a vector quantity, meaning it has both magnitude and direction.

• It is calculated by multiplying the force applied by the distance from the axis of rotation.

• Units of torque are typically expressed in Newton-meters (Nm) or pound-feet (lb-ft).

• Examples of torque include the force applied by a wrench to tighten a bolt or the rotational force of an engin...read more

Nitrogen is used in welding to prevent oxidation and improve weld quality.

• Nitrogen is an inert gas that does not react with the metal being welded, preventing oxidation and contamination.

• It creates a protective atmosphere around the weld, reducing the risk of defects and improving the overall quality.

• Nitrogen can be used in various welding processes such as TIG (tungsten inert gas) and laser welding.

• Other gases that ca...read more

The mechanical advantage of a double pulley is the ratio of the output force to the input force.

• A double pulley has two grooved wheels, allowing a rope or cable to pass through.

• The mechanical advantage is determined by the number of supporting ropes or cables.

• With a double pulley, the mechanical advantage is equal to the number of supporting ropes or cables.

• For example, if there are two supporting ropes, the mechanical...read more

A universal coupling is a mechanical device that connects two rotating shafts allowing them to move in any direction.

• It is also known as a universal joint or U-joint.

• It is commonly used in automobiles to connect the drive shaft to the transmission.

• It allows for the transmission of power between two shafts that are not in a straight line.

• It consists of a cross-shaped component with four bearings that allow for movement ...read more

One disadvantage of supercritical boilers is their high cost.

• Supercritical boilers are expensive to manufacture and install.

• They require high-quality materials to withstand high pressures and temperatures.

• Maintenance and repair costs for supercritical boilers are also high.

• Supercritical boilers may have limited flexibility in terms of load changes.

• They require a longer startup time compared to subcritical boilers.

Mechanical engineers use various computer programs for design, simulation, and analysis.

• CAD software for designing and modeling mechanical components and systems

• Finite element analysis (FEA) software for simulating and analyzing stresses and deformations in mechanical structures

• Computational fluid dynamics (CFD) software for analyzing fluid flow and heat transfer in mechanical systems

• Programming languages such as MATLA...read more