Preboards

The primary advantage of FM over AM is

• FM has a greater bandwidth than AM

• Noise Immunity

• More complex

• Greater capture effect

In which type of electronic communication does the information travel in two directions?

• Simplex

• Bicomm

• Half duplex

• Full duplex

An initially uncharged capacitor C is connected in series with resistor R. This combination is then connected to a battery of emf V0. Sufficient time elapses so that a steady state is reached. Which of the following statements is NOT true?

• The time constant is independent of V0

• The final charge on C is independent of R

• The final total thermal energy generated by R is independent of R

• The total total thermal energy generated by R is independent of V0

Which of the following type of fault used only the equivalent positive sequence impedance of the circuit in the short-circuit calculation?

• Line to line fault

• Three phase fault

• Single line to ground fault

• Double line to ground fault

What is the purpose of reactor in short circuit?

• To open the line in short circuit

• To lessen the current in short circuit

• To decrease the circuit resistance

• To increase the current in short circuit

Ideal transformer assumptions do NOT include

• Zero resistance of the winding

• Zero reactance of the winding

• no saturation of the core

• no leakage flux

For a transmission line terminated in its characteristic impedance, which of the following statement is incorrect:

• It is a smooth line

• The energy distribution between magnetic and electric field is not equal.

• Standing wave does not exist.

• Efficiency of transmission of power is maximum

What is the effects on current flow does in reversing the direction of movement of a conductor

in the magnetic field of a generator?

• It will increase the current flow

• It reverses the direction of current flow

• It will neutralizes the current flow

•  It has no effect on the current flow

The value of inductance in three-phase line is _____ times the loop inductance for single-phase line.

• 2

• 1/2

• 1/3

• 3

What is the main reason that alternating current replaced direct current for general used?

• AC voltages conveniently transformed

• AC generators do not need slip rings

• AC minimizes magnetic fields

• A given AC current does not heat a pover line as much the same as DC current