The expected answers were:
(a) Transducers are used to transform energy from one form into another.
(b)

(i)	Transducer	(ii)	Transducer function
Thermocouple		Heat energy-to-electrical energy (Heat
		sensor)
Microphone		Sound energy to electrical energy
		( Pressure sensor)
Strain guage		Mechanical energy to electrical energy
Tachogenerator		Kinetic energy to electrical energy
		( Speed sensor)
Solar cell		Light energy to electrical energy

The question was on Control Circuits. It was quite popular.

As reported, by far the simplest question, in which many candidates scored full marks by stating that the transducer converts energy from one form to another; and identifying common transducers as including the generator, electric motor, microphone, loudspeaker and solar cell.