Answer / ashwani goel

the pmmc instrument is the cheapest one because EDMis the
most expensive and rectifier and thermocouple types already
contain PMMC intruments. hence pmmc is cheapest

Answer / brijesh kr. bind

pmmc is the cheapest instrument.bcoz edm is costly and pmmc
is also the part of rectifier and thermocouple.

Answer / jignesh

rectifier is cheapest bcoz diode work as arectifier and is
cost is only 1 rs.

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