Interview Questions.

Question 1. What Is The Function Of A Boiler?

Answer :

A Boiler materials dry and saturated steam at the required stress.

Question 2. Briefly Explain The Boiler Mounting, And Name Its Classifications?

Answer :

A specific equipment or device is positioned at the boiler to improve its safety, upkeep convenience and steam deliver, is known as Boiler mounting. Following are the special Boiler mountings,

Water level
Supply valves
Pressure gauge
Stop valve
Feed take a look at valve
Blow off cock
Anti printing pipe
Fusible plugs etc
Mechanical Engineering Interview Questions
Question three. What Is A Valve?

Answer :

A valve is used to manipulate the glide of fluid within the pipeline.

Question 4. Discuss The Function Of Safety, Stop, And Feed Check Valves?

Answer :

Safety valve. This sort of valve is used to preserve the boiler secure by way of controlling the operating stress within the boiler and withstand the blasting because of the excessive stress; the valve is set up with boiler.
Stop valve. This form of valve is used to control the go with the flow of steam from the boiler to the engine. 
Feed Check valve. This sort of valve is used to manipulate the supply of feed water to the boiler. The water level continually stays regular while it works.
Question 5. What Is Meant By A Piston And Cylinder?

Answer :

A piston is a cylinder piece of steel. It is moved within a hole cylinder through the pressure of fluid (liquid, steam or gasoline).Pistons are smooth in shape in the cylinder and piston earrings are used to save you the leakage in between piston and cylinder.

Boilermaker Interview Questions
Question 6. Name The Different Types Of Materials Used To Made Pistons?

Answer :

Pistons are made by exceptional materials which include solid iron, cast metallic, aluminium ,bronze, cast metallic, brass etc.

Question 7. What Is A Locomotive Piston?

Answer :

Locomotive pistons are of disc type which are typically manufactured from cast iron or metal. Its piston earrings are made of solid iron and are located by using dowels.

Power Plant Project Interview Questions
Question 8. What Is The Difference Between Plunger Piston And Bucket Piston?

Answer :

Plunger piston is appropriate when the fluid pressure is acting on one side of the piston handiest.
Bucket piston has one or extra valves which permit the fluid to pass one side to the other.
Question 9. What Is A Buck Piston?

Answer :

It is also referred to as trunk piston that is open ended and is usually made longer. Cross head or piston rod isn't always essential for it.

Dyeing Interview Questions
Question 10. What Are Piston Rod And Piston Valve Of Steam Engine?

Answer :

Piston rod is geared up in the piston. The diameter of this rod is within the piston is decreased to about three/4th of its diameter. Piston valve is tightened by using a nut and locked out by using a pin.

Question 11. Write A Short Note On Steam Engine Piston?

Answer :

Generally box type or hole kind steam engine pistons are used. These are usually product of forged iron. Box kind pistons are cast in one piece with hole center. This piston is secured by means of a nut to the piston rod. To prevent the leakage of the steam two piston jewelry are provided with the piston. In the cutting-edge reciprocating steam engines the piston made from forged steel and of conical shape is used. The piston made from cast metal is pricey than that of cast iron.

Thermal Power Plant Interview Questions
Question 12. What Is A Cross Head Of A Steam Engine?

Answer :

Cross head is used to attach the connecting rod and the piston rod. It is typically made of forged iron, forged steel or forged metallic. The piston rod can be fixed to the pass head either by means of a screw or with the aid of a cotter pin.

Mechanical Engineering Interview Questions
Question 13. Explain About A Crankshaft?

Answer :

The crankshaft converts the rectilinear reciprocating motion into circular movement and vice versa. When the crankshaft actions via 180 diploma, the crank travels over a semicircular direction of the diameter. The crank travels one whole revolution and piston completes  strokes forwards and backwards, whilst the crankshaft actions via 360 degree.

Question 14. What Is A Crank?

Answer :

A Crank is a simple lever which gets the thrust of the piston via the connecting rod. Generally crank disc, eccentric crank, overhung crank, bell crank etc. Are used.

Question 15. Name The Different Types Of Packings Used In Steam Engine?

Answer :

Soft packing. Used for trendy purposes. It is not appropriate for high pressures and temperatures.
Metallic packing. It is commonly used in which excessive pressures and temperatures exist due to the fact it's far extra perfect for this reason.
Semi-metal packing. It is used wherein medium pressures and temperatures exist.
Boiler Operator Interview Questions
Question sixteen. Write The Procedure For Starting The Power Pump?

Answer :

Clean the pump.
Check the ideal amount of the endorsed grade of oil to the pump.
Check the power rotation.
Check grease or oil to the coupling if vital.
Turn the pump through hand(it must run freely)
Open the suction, vent, pass and discharge valves.
Start the pump.
Question 17. Explain Briefly The Metering Pumps?

Answer :

Generally these sorts of reciprocating pumps are enormously small and light in weight. Small reciprocating pumps are fixed on a mild structural frame and other pumps have metallic base bolted with the floor. Tank set up pumps need no foundation however the tank is to be fixed.

Compressors Interview Questions
Question 18. Name Different Types Of Reciprocating Pumps?

Answer :

Steam pumps, Power pumps, Metering pumps, Axial piston pumps and Sucker rod pumps.

Boilermaker Interview Questions
Question 19. Write The Operational Steps Of A Steam Pump?

Answer :

Make certain that every one the suction, discharge, steam and exhaust lines are open.
Open steam give up drain valves.
Prime via establishing air cock on liquid cylinder cap.
Crack steam valve to heat the pump.
Open the steam valve until the piston begins to transport slowly.
Close the drain valve and open the steam valve until the pump comes as much as the working pace.
To prevent the pump close the steam valve first after which close exhaust, suction and discharge valves.
Question 20. What Are The Reasons When Piping Vibrates In Power Pumps?

Answer :

In a electricity pump the piping vibrates when discharge pipe is undersize or suction pipe is undersize.

Nuclear Power Plant Interview Questions
Question 21. Why A Centrifugal Pump Will Not Start?

Answer :

It is due to,

Impellers locked or no longer adjusted nicely 
Trash in casing
Faulty motor.
Too tons bearing friction.
Question 22. Explain About Hydraulic Ram?

Answer :

It is an automated pump. It is typically used to raise a water falling via a small top. I.E, water falling in big quantity via a small height is lifted to a extra height in small quantity. The automated action of the ram takes region because of the inertia force.

Question 23. Name Different Types Of Rotary Pumps?

Answer :

External equipment pumps, Internal equipment pumps, Sanitary type pumps, External screw pumps, Three screw pumps, Swinging and sliding vane pumps and Flexible rotor pumps.

Mechanical Fitter Interview Questions
Question 24. Why A Centrifugal Pump Does Not Deliver Liquid?

Answer :

The centrifugal pump does now not deliver liquid because of:

Wrong rotation
Pump no longer primed
Speed too low.
Power Plant Project Interview Questions
Question 25. What Are The Causes Of Reduced Capacity Or Pressure In Axial And Radial Piston Pumps?

Answer :

Clogged or leaking suction.
Oil is simply too thick.
Relief valve issues.
Liquid lever is simply too low.
Question 26. Name Different Types Centrifugal Pumps?

Answer :

Multistage pumps, Process type pumps, Chemical system pumps, Canned motor pumps, Paper stroke pumps and Deepwell turbine pumps.

Thermal Engineer Interview Questions
Question 27. What Is The Main Reason Of Steam Pump Breakdown?

Answer :

Steam pump stops due to valve trouble. I.E, incorrectly set or worn steam valves may forestall the steam pump.

Dyeing Interview Questions
Question 28. Why A Steam Pump Does Not Discharge?

Answer :

It is due to ,

Suction air bound
Suction elevate too high
Obstruction in suction line 
Pump not primed.
Question 29. What Is A I.C Engine?

Answer :

It is a warmth engine in which the chemical energy of combustion is released in the engine cylinder, thus gas is fired within the cylinder. It is more useful as compared to the other engines.

Question 30. Write A Short Note About Spark Plug?

Answer :

The spark plug is the principle a part of the engine. In the I.C engine having spark ignition, the gasoline –air combination within the cylinder is ignited thru the medium of spark ignition electrical machine which occurs on the electrode of the spark plug. The fee brought on into the cylinder throughout its cycle’s first system. In the spark ignition engine , the gases compressed in the cylinder in the course of the compression stroke consists of the fuel and air.

Question 31. What Is Connecting Rod Of An I,c Engine?

Answer :

The connecting rod is made from solid metal. Its huge end is connected to the crank and small is hooked up to the piston. The brass inside the big give up is die forged and covered with white metallic. Separate connecting rods are used for petrol, diesel and gas engines.

Question 32. Explain About A Carburetor?

Answer :

The manipulate and regulation of the aggregate electricity can be received mechanically in the engine through carburetor. In its operation air from the air purifier enters the main air passage and passes thru the choke. Fuel from the flow chamber enters and flows to the fuel jet. The melancholy in the choke reasons petrol to waft from the jet where atomization of the gas takes vicinity. The mixture of the gasoline and air passing into the induction machine. The suction piston will rise and fall beneath the impact of engine suction which combined with the position of throttle manage.

Question 33. What Is The Purpose Of Fuel Injector Pump In The Engine?

Answer :

In the modern-day oil engines the injection of the fuel into the cylinder is executed not by way of an air blast however by using injection pump. These pumps are built strongly and accurately. For stopping after drip and consequent burning of the gas left at the spray nozzle hints, its stress have to drop as speedy and as it should be because it rises.

Thermal Power Plant Interview Questions
Question 34. What Do You Meant By A Petrol Engine?

Answer :

It is a spark ignition engine. The induced charge in its cylinder includes a mixture of air and gas. The gasoline used in it can be vaporized easily. The petrol engine can operated at the compression-ignition principle.

Question 35. What Is A Two Stroke Petrol Engine?

Answer :

It is a easy engine having Piston, Connecting rod and Crankshaft. Valves and valve actuating accessories are removed due to the fact consumption and exhaust gases executed by means of the outlet in the cylinder wall which can be managed by way of the piston. This form of engine has a small horse power output.

Question 36. What Is A Diesel Engine?

Answer :

It is a engine wherein a low grade oil is used. The gasoline is ignited by using the heat of air in this engine.

Boiler Operator Interview Questions
Question 37. Write A Short Note About Two Stroke Diesel Engine?

Answer :

It is an engine wherein two strokes of the piston are required to complete one cycle to operate the engine. The capabilities of each the strokes are as below:

First stroke compress the air inside the engine to ignite the gasoline oil.
Second stroke is the power stroke that is produced by means of the burning gases.
Question 38. Explain About A Gas Engine?

Answer :

It is a slow speed engine in which gaseous gas is used. Variety of fuel fuels are used including town gasoline, natural fuel, blast furnace fuel, oil gas, coke oven fuel and so on. This type of engines are typically of desk bound kind however portable fuel engines also are to be had.

Question 39. What Is The Difference Between Single Acting And Double Acting Engines?

Answer :

Single performing Engine. It is a engine wherein the pressure producing electricity stroke is exerted simplest on one aspect of the piston. It works on both the 2 stroke and four stroke engines.

Double appearing Engine. It is a engine wherein the strain producing strength stroke is exerted first on one side of the piston and then on the opposite stop. It makes every stroke of the piston a power stroke.

Question 40. What Is Meant By Four Stroke Diesel Engine?

Answer :

It is an engine in which 4 strokes of the piston are required to finish one cycle to function the engine. The features of each stroke is as beneath:

First stroke draws air to the cylinder.
Second stroke compresses the air.
Third stroke is the electricity stroke that's produced by the burning gases.
Fourth stroke drives out the burnt gases.
Compressors Interview Questions
Question 41. Define Static Electricity?

Answer :

When a glass rod is rubbed with a silk cloth, it will become nice charge and while a ebonite rod is rubbed with a woolen cloth, it will become a terrible charge. The change produced in glass or ebonite rod is called Static energy. There is not any movement of electrons in this electricity.

Question forty two. What Is Current Electricity?

Answer :

The electrons flow and flow alongside the conductor in this electricity. If direction of waft electrons is continually the same, it is known as Direct Current (D.C). If the direction of flow of electrons is modified constantly, it's miles called Alternative Current (A.C).

Nuclear Power Plant Interview Questions
Question 43. Define Volt?

Answer :

Volt is the force which reasons an electron go with the flow of one ampere via a resistance of 1 ohm.

Question 44. What Are The Advantages Of A.C Over D.C?

Answer :

A.C is produced a good deal greater in comparison to D.C.
An opportunity voltage may be expanded to a preferred restrict with the aid of a transformer whilst D.C can not be extended.
A.C is much less pricey than that of D.C.
A.C induction motors are more useful for constant pace compared to D.C motors.
A.C vehicles require less upkeep in comparison to D.C automobiles.
A.C mills can be made in massive length that could run at excessive pace additionally than that of D.C generators.
Question 45. Define Ampere?

Answer :

It is the amount of electron waft inside the modern . In one ampere 6.28*10/18 electrons has a given factor in the conductor inside a duration of 1 2nd.

Question forty six. Write A Short Note About Fuse?

Answer :

A fuse is a small piece of twine that is normally used inside the circuit. It protects in opposition to the terrible consequences of brief circuiting. When a present day inside the circuit rises above its favored limit, the fuse will be heated and soften which causes the circuit “Open” and saves the components and appliances from the viable damage.

Question 47. What Do You Meant By A Short Circuit?

Answer :

It has no longer resistor. It causes a high current flow which might also heat up the wire. It may additionally motive hearth and harm the electric home equipment within the circuit.

Question 48. What Are The Effects Of Electric Current?

Answer :

Heating effect. When a present day flows in a twine and turbines heat like filament lamp, electric heater, furnace etc. Is called electric powered impact.
Chemical Effect. When strength passes through a chemical solution , it may make chemical like cells, batteries, electroplating etc. It's miles referred to as chemical effect.
Magnetic effect. When a modern-day flows in a coil ,it makes a magnetic discipline like bell, motor, generator, transformer, tape recorder etc. Known as magnetic effect.
Question forty nine. What Is The Difference Between Conductors And Insulators?

Answer :

Conductors. When a material permits electrons to glide through it called conductors. Eg. Copper ,aluminium ,iron ,tin, gold .
Insulators. The substances which save you the float of electrons are known as insulators. Eg: Rubber ,asbestos ,plastics, mica.
Question 50. What Are The Advantages Of D.C?

Answer :

It is suitable for traction work.
It is suitable for charging batteries.
It is suitable for variable pace cars used in printing machines.
It is beneficial lamps used in projectors.