Module 2

Which is not a cause for surge voltage in the system?

• RESONANCE

• LIGHTNING

• FAULT

• SWITCHING

What is the type of communication that only one of the two party can transmit at a time?

• Full Duplex

• Bicomm

• Half Duplex

• Simplex

What is the minimum number of wattmeter required to measure unbalanced power of a three phase system?

• 2

• 3

• 4

• 1

Which is true about magnetic flux?

• have sources

• have sink only

• have sources and sink

• do not have source & sink

The current in RLC circuit at resonance

• maximum

• infinity

• minimum

• zero

If the resistance in a series RC circuit is increase in magnitude of the phase angle

• increases

• remain the same

• decreases

• changes in an undertermined manner

An automatic device that operates at preset value is known as

• mercury switch

• relay

• fuse

• contractor

How many ohms will be required for a single electrode pipe

• 5 or less

• 10 or less

• 20 or less

• 25 or less

A capacitance C is charged through resistance R. The time constant of the charging circuit is given by

• RC

• 1/RC

• C/R

• R/C

What is the IEEE standard device number 21?

• Overvoltage Relay

• Distance Relay

• Differential Relay

• Undervoltage Relay