20+ Nirma Interview Questions and Answers

To reduce losses in power line, proper maintenance, use of efficient transformers, and voltage regulation are key skills.

• Regular maintenance of power lines and transformers can prevent losses due to wear and tear.

• Using efficient transformers can reduce losses due to heat dissipation.

• Voltage regulation can prevent overloading and reduce losses due to resistance.

• Implementing smart grid technology can also help in reducing losses.

• Proper insulation and grounding can prevent leaka...read more

Control systems use feedback to maintain desired outputs and adjust inputs to achieve stability and accuracy.

• Control systems receive input signals and compare them to desired output signals.

• Feedback is used to adjust inputs to achieve desired outputs.

• Control systems can be open-loop or closed-loop.

• Examples include thermostats, cruise control in cars, and autopilot systems in airplanes.

There are three types of heat transfer methods: conduction, convection, and radiation.

• Conduction: transfer of heat through a material without any movement of the material itself

• Convection: transfer of heat through the movement of fluids or gases

• Radiation: transfer of heat through electromagnetic waves

• Examples: boiling water (convection), touching a hot stove (conduction), feeling the warmth of the sun (radiation)

Min. Sbc. stands for minimum safe bearing capacity. If soil bearing capacity is low, shallow foundations like spread footings or mat foundations may be used.

• Min. Sbc. is the minimum safe bearing capacity of the soil, which is the maximum pressure that can be applied to the soil without risking shear failure.

• If the soil bearing capacity is low, shallow foundations such as spread footings or mat foundations may be used instead of deep foundations.

• Spread footings distribute the ...read more

Main subjects in a BE program in Mechanical Engineering include Thermodynamics, Fluid Mechanics, and Mechanics of Materials.

• Thermodynamics: study of energy and heat transfer in mechanical systems, laws of thermodynamics, applications in engines and refrigeration

• Fluid Mechanics: study of fluids in motion, properties of fluids, Bernoulli's equation, applications in pumps and turbines

• Mechanics of Materials: study of behavior of materials under different loads, stress and strain ...read more

Unit process involves a series of operations to achieve a specific goal, while unit operation is a single step in a process.

• Unit process involves multiple unit operations to achieve a specific goal.

• Unit operation is a single step in a process that involves physical or chemical changes.

• Examples of unit processes include distillation, filtration, and crystallization.

• Examples of unit operations include mixing, drying, and evaporation.

Types of pumps include centrifugal, reciprocating, and rotary pumps. Valves can be classified as gate, globe, ball, and butterfly valves. Heat exchangers include shell and tube, plate, and finned tube exchangers.

• Types of pumps: centrifugal, reciprocating, rotary

• Types of valves: gate, globe, ball, butterfly

• Types of heat exchangers: shell and tube, plate, finned tube

Bearings are mechanical components that reduce friction between moving parts.

• Bearings are used in machines to support rotating shafts and reduce friction.

• There are several types of bearings including ball bearings, roller bearings, and plain bearings.

• Ball bearings use balls to reduce friction and are commonly used in applications such as skateboards and bicycles.

• Roller bearings use cylindrical rollers to reduce friction and are commonly used in applications such as conveyor b...read more

Types of pumps include centrifugal, positive displacement, and axial flow pumps. Heat transfer types in distillation include conduction, convection, and radiation.

• Types of pumps: centrifugal, positive displacement, axial flow

• Heat transfer types in distillation: conduction, convection, radiation

Induction motors work by inducing a current in the rotor through electromagnetic induction.

• Induction motors have a stator with coils that are connected to an AC power source.

• When the AC power is applied, it creates a rotating magnetic field in the stator.

• This rotating magnetic field induces a current in the rotor, causing it to rotate.

• The rotor does not have any electrical connections and relies on induction to generate motion.

• Induction motors are commonly used in household a...read more

Gears are mechanical components that transmit power and motion between rotating shafts. There are various types of gears.

• Gears are used to transmit power and motion between rotating shafts

• They are made up of teeth that mesh with each other to transfer torque

• Types of gears include spur, helical, bevel, worm, rack and pinion, and planetary gears

• Spur gears are the most common type and have straight teeth

• Helical gears have angled teeth and produce less noise and vibration than sp...read more

Market experience refers to the knowledge and understanding of the industry, customers, competitors, and trends gained through working in the market.

• Market experience is the understanding of the market dynamics, including customer needs, preferences, and behavior.

• It involves knowledge of the industry, including the products, services, and trends.

• It also includes understanding the competition and their strengths and weaknesses.

• Market experience helps in identifying opportuniti...read more

An induction motor is a type of AC motor where power is supplied to the rotor by electromagnetic induction.

• Consists of a stator and a rotor

• Does not require any physical connection between the rotor and the stator

• Commonly used in industrial applications for driving pumps, fans, compressors, and conveyor systems

A centrifugal pump is a mechanical device that uses rotational energy to move fluid through a piping system.

• Centrifugal pumps work by converting rotational kinetic energy into hydrodynamic energy to move fluid.

• They consist of an impeller that rotates within a casing, creating a centrifugal force that pushes the fluid outwards.

• The fluid enters the pump through the center of the impeller and is accelerated radially outward.

• Common applications of centrifugal pumps include water ...read more

Types of distillation columns include batch, continuous, fractional, and steam distillation.

• Batch distillation: Used for small-scale production and involves separating components based on boiling points.

• Continuous distillation: Used for large-scale production and involves a continuous feed of mixture and product removal.

• Fractional distillation: Used for separating components with close boiling points by creating multiple vaporization-condensation cycles.

• Steam distillation: Us...read more

Types of starters used in electrical engineering for controlling the starting of motors.

• Direct On-Line (DOL) starter

• Star-Delta starter

• Auto-transformer starter

• Soft starter

• Variable frequency drive (VFD) starter

Coupling is a device used to connect two shafts together at their ends for transmitting power.

• Couplings are used to transmit power from one shaft to another.

• They are used to compensate for misalignment between the shafts.

• Couplings can also be used to absorb shock and vibration.

• Examples of couplings include gear couplings, jaw couplings, and fluid couplings.

Types of pumps include centrifugal pumps, positive displacement pumps, and axial flow pumps.

• Centrifugal pumps: use rotating impellers to increase the velocity of the fluid.

• Positive displacement pumps: trap a fixed amount of fluid and then force it into the discharge pipe.

• Axial flow pumps: move fluid parallel to the pump shaft.

• Examples: Centrifugal pump - water pump, Positive displacement pump - gear pump, Axial flow pump - propeller pump

A motor is a device that converts electrical energy into mechanical energy to produce motion.

• Motors can be classified into different types such as AC motors and DC motors.

• Common examples of motors include induction motors, synchronous motors, and brushed DC motors.

• Motors are used in various applications such as industrial machinery, household appliances, and automotive systems.