ELECTRONICS CHAPTER 6 2

In a de series motor, the torque varies

• Inversely as the armature current

• Inversely as the square of the current

• Directly proportional to the current

• Directly proportional to the square of the current

What is used as the dielectric material in high voltage transformers?

• Porcelain

• Bakelite

• Mica

• Nylon

The winding with the greater insulation is the

• HV winding

• LV winding

• HC winding

• None of these

A device that functions as an inductor and a transformer.

• Flyback transformer

• Autotrans former

• Dipstick

• Solenoid

A sinusoidal waveform mathematically represented by is

• An EVEN function

• An ODD function

• A function that is even as well as have wave symmetric

• A function that is neither odd or even

The principal disadvantage of a voltage multiplier is:

• excessive curtent

• excessive voltage

• insufficient rectification

• poor regulation

A pulse transformer

• a narrowband transformer

• a wideband transformer

• similar to a conventional transformer designed to handle square wave signals

• none of these

The principal disadvantage of a voltage multiplier is

• Excessive current

• excessive voltage

• insufficient rectification

• poor regulation

A three-terminal, unidirectional thyristor.

• DIAC

• Shockley

• TRIAC

• SCR

What rectifier filter circuit has a high output voltage but poor regulation, poor transformer utilization factor but high peak

• RC filter

• Choke filter

• Resistor input filter

• Capacitor input filter