A transducer that converts measurand into the form of pulse is called

The correct answer is D. Pulse transducer.

A pulse transducer is a type of transducer that converts a physical quantity into a series of pulses. The pulses can be electrical, mechanical, or optical. Pulse transducers are often used in measurement and control applications.

An active transducer is a transducer that requires an external power source to operate. An analog transducer is a transducer that produces an output signal that is proportional to the input signal. A digital transducer is a transducer that produces an output signal that is in the form of discrete numbers.

Here are some examples of pulse transducers:

• Piezoelectric transducers: These transducers convert mechanical energy into electrical energy or vice versa. They are often used in ultrasonic sensors and actuators.
• Electromagnetic transducers: These transducers convert mechanical energy into electrical energy or vice versa. They are often used in proximity sensors and position sensors.
• Optical transducers: These transducers convert light into electrical energy or vice versa. They are often used in optical sensors and optical switches.