Gayatrishakti Paper & Boards Mechanical Maintenance Engineer Interview Questions and Answers

PNP transistor is a type of bipolar junction transistor. Multimeter is used to measure voltage, current and resistance. Tracing a circuit involves identifying the path of current flow. Mounting and unmounting components on PCB involves soldering and desoldering.

• PNP transistor is a three-layer semiconductor device with emitter, base and collector regions.

• Multimeter can be used in different modes such as voltage, current...read more

There are seven types of plastics, each with unique properties and uses.

• There are seven types of plastics identified by the resin identification code (RIC) system.

• The seven types are: PET, HDPE, PVC, LDPE, PP, PS, and OTHER.

• Each type has unique properties and uses, such as PET being used for water bottles and HDPE for milk jugs.

• The OTHER category includes plastics such as polycarbonate and polylactic acid (PLA).

Density and melting point vary for different engineering plastic materials such as ABS, PP, PC, and Nylon.

• Density of ABS ranges from 1.03 to 1.21 g/cm³ and its melting point is around 105°C.

• PP has a density of 0.90 to 0.91 g/cm³ and its melting point is around 160°C.

• PC has a density of 1.20 to 1.22 g/cm³ and its melting point is around 300°C.

• Nylon has a density of 1.12 to 1.15 g/cm³ and its melting point is around 220°