ELECTRONICS CHAPER 7 2

A potentiometer is used to:

• compare voltages

• measure power factor

• compare currents

• measure phase sequence

The synchronous modems are more costly than the asynchronous modems because

• they produce large volume of data

• they contain clock recovery circuits

• they transmit the data with stop and start bits.

• they operate with a larger bandwidth

The term 'Poison's ratio' is connected With

• strain gauge

• LVDT

• Bourdon tube

• capacitance transducer

Which of the following is needed to extend the range of a milliammeter to read wotages of the order of 100 V?

• parallel high-value resistance

• a series high-value resistance

• a parallel low-value resistance

• a series low-value resistance

Which would refer to a moving iron instrument?

• An uneven scale, measuring d.c. and a.c

• An even scale, measuring d.c and a.c.

• An uneven scale, measuring a.c. only

• An uneven scale, measuring d.c. only

Which would refer to a moving coil rectifier instrument?

• An uneven scale, measuring d.c.

• An even scale, measuring a.c.

• An uneven scale, measuring a.c.

• An even scale, measuring d.c.

What device is similar to an RTD but has a negative temperature coefficient?

• Strain gauge

• Thermistor

• Negative-type RTD

• Thermocouple

If an ideal current source is suppressed, it is represented by

• a short circuit

• an open circuit

• its internal resistance

• an short circuit current

One variation of the original D'Arsonval meter movement is called:

• Tension spring movement

• Taut band movement

• Moving coil movement

• spring band movement

Damping provides

• Good accuracy

• Starting torque of the meter pointer

• Braking action on a meter pointer

• Counter torque to deflection torque