Control Systems
The device necessarily used for automatic temperature control in a furnace is

 Any of above.
 Auto-transformer.
 Thermocouple.
 Thermostat.

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Control Systems
An open loop control system, represented by the transfer function G ( s ) = ( s - 1 ) / ( s + 2 )( s + 3 ), is

  unstable and of the non minimum phase type .
  stable and of the non-minimum phase type.
  unstable and of the minimum phase type.
  stable and of the minimum phase type.

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