MECHANICAL ENGINEERING INTERVIEW QUESTIONS

MECHANICAL ENGINEERING INTERVIEW QUESTIONS

1.     What is meant by COP?

The coefficient of performance or COP (sometimes CP) of a heat pump is a ratio of heating or cooling provided to work required. Higher COPs equate to lower operating costs.

2.     What is meant by quality?

Fitness for use

3.     What is meant by entropy?

a thermodynamic quantity representing the unavailability of a system's thermal energy for conversion into mechanical work, often interpreted as the degree of disorder or randomness in the system.

"the second law of thermodynamics says that entropy always increases with time"

4.     What is meant by enthalpy?

a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.

5.     Density of steel?

8,050 kg/m³

The density of steel varies based on the alloying constituents but usually ranges between 7,750 and 8,050 kg/m³ (484 and 503 lb/cu ft), or 7.75 and 8.05 g/cm³ (4.48 and 4.65 oz/cu in).

6.     Density of water?

1,000 kg/m³

Type of steel	Percentage of carbon
Mild steel	Up to 0.25%
Medium carbon steel	0.25% to 0.45%
High carbon steel	0.45% to 1.50%

7.     Amount carbon percentage in steels?

8.     What is meant by firing order?

The firing order is the sequence of power delivery of each cylinder in a multi-cylinder reciprocating engine. This is achieved by sparking of the spark plugs in a gasoline engine in the correct order, or by the sequence of fuel injection in a Diesel engine.

The general firing order of a 4 cylinder engine is- 1---3---4---2.

9.     What is meant by curie point?

In physics and materials science, the Curie temperature (T_C), or Curie point, is the temperatureat which certain materials lose their permanent magnetic properties, to be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature

10. What is meant by tensile strength?

the resistance of a material to breaking under tension.

Material	Yield strength (MPa)	Ultimate tensile strength (MPa)
Steel, structural ASTM A36 steel	250	400-550
Steel, 1090 mild	247	841
chromium-vanadium steel AISI 6150	620	940
Human skin	15	20

GENERAL AWARENESS QUESTIONS

1.     What is meant by bitcoin?

a type of digital currency in which encryption techniques are used to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank.

"bitcoin has become a hot commodity among speculators"

"bitcoins can be used for online transactions between individuals"

1 Bitcoin = 40160.14 Indian Rupee

2.     What is meant by PTC?

Paid to click (PTC) is an online business model that draws online traffic from people aiming to earn money from home. PTC websites act as middlemen between advertisers and consumers; the advertiser pays for displaying ads on the PTC website, and a part of this payment goes to the viewer when he views the advertisement.

3.     What is meant by ITC?

Its diversified business includes five segments: Fast-Moving Consumer Goods (FMCG), Hotels, Paperboards & Packaging, Agri Business & Information Technology. Established in 1910 as the Imperial Tobacco Company of India Limited, the company was renamed as the Indian Tobacco Company Limited in 1970 and further to I.T.C.

4.     How torrent works?

If 10,000 people are downloading the same file, it doesn't put a lot of stress on a central server. Instead, each downloader contributes upload bandwidth to other downloaders, ensuring the torrent stays fast. Importantly, BitTorrent clients never actually download files from the tracker itself.

5.     The manufacturer of apple phones?

Hon Hai Precision Industry Co., Ltd., trading as Foxconn Technology Group, is a multinational electronics contract manufacturing company headquartered in New Taipei, Taiwan. Foxconn is the world's largest electronics contractor manufacturer, and the third-largest information technology company by revenue.

The company signs all its products, "Designed by Apple in California," but in the U.S., design is as far as Apple is willing to go. The tech giant outsources hundreds of thousands of manufacturing jobs to countries like Mongolia, China, Korea and Taiwan.

6.     What is meant by C – level executives?

The highest-level executives in senior management usually have titles beginning with "chief" forming what is often called the C-suite. The traditional three such officers are chief executive officer (CEO), chief operations officer (COO), and chief financial officer (CFO).

7.     what is meant by OLED?

a light-emitting diode containing thin flexible sheets of an organic electroluminescent material, used for visual displays.

"because OLEDs emit light, they consume significantly less power"

8.     What Is meant by Wi-Fi?

The definition of WIFI is Wireless Fidelity.

9.     The basic plat form for android OS?

Java

The official language for Android development is Java. Large parts of Android are written in Java and its APIs are designed to be called primarily from Java. That said, it is possible to develop C and C++ apps using the Android Native Development Kit (NDK), however it isn't something that Google promotes.

10. Name five Languages used for computer programming?

SQL. It's no surprise SQL (pronounced 'sequel') tops the job list since it can be found far and wide in various flavors. ...

Java. The tech community recently celebrated the 20^th anniversary of Java. ...

JavaScript. ... C# ... C++ ... Python. ... PHP. ... Ruby on Rails.