Answer / sethupathiraja

1. rotary encoder 
2.linear encoder.

These two are had

a.incremental
b.absolute

Answer / abdul ghaffar khoso

1.optical encoder
2.incremental encoder
3.linear encoder
4.magnetic encoder

Answer / scot

Simple answer is two
incremental
absolute.
now from those you can expand on sensing technology (optical, magnetic, inductive, see newall.com)
Expand on mounting: shafted, hollow shaft, modular.
expand on type: rotary, linear.

Answer / krishna

There are three type of encoders
1 shaft encoder
2 hollow encoder
3 blind encoder

Answer / rahul w

these are types of encoders
1.absolute encoder
2.rotary encoder
3.incremental encoder

Answer / mansoor ahmad siddiqui

Two basic Types of encoders.
1- Rotary or shaft encoders.
2- Linear Encoders.

then in each type there are again two types depending upon signal named.
1-Incremental
2-Absolute.

then many types in design as per requirement but every encoder will follow above mentioned type.

Answer / nitika

1> decomal to binary
2> octal to BCD
3> hexadecimal to binary.

Answer / janakiraman

1)3to8 encoder
2)4to16 encoder
3)binary encoder

Answer / rahul

it is an electronic device,which convert mechanical
rotation into electrical energy $it is count in 2000rev=1mm
incrimantal encoder .

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