EE 2nd set greenbok

Which of the following is NOT a property of magnetic field lines?

• The field is stronger where the lines are closer together.

• The lines intersect surfaces of equal intensity at right angles.

• Magnetic field lines have no beginning and no ends.

• The lines cross themselves only at right angles.

Which of the following effects are generally less for an alternating current than for a direct current?

• heating effects

• chemical effects

• magnetic effects

• impedance

Which of the following cannot have a single unit of 100 MW?

• Hydro power plant

• Steam power plant

• Diesel power plant

• Nuclear power plant

In the left hand rule, thumb always represents direction of the .

• voltage

• force on conductor

• current

• magnetic field

Three 3-ohm resistors are connected in parallel. This combination is then placed in series with another 3-ohm resistor. What is the equivalent resistance in ohm?

• 12

• 9

• 4

• 6

Copper loss of a transformer are determined by means of a/an test.

• open-circuit

• polarity

• short-circuit

• inductive-circuit

What is/are the main reason's for using high voltage in the transmission of power in the grid system?

I. to transmit bulk power with minimum line losses

II. Increase system reliability

• II only

• both I and II

• either I and II

• I only

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

• Half duplex

• Full duplex

• Multiplex

• Bicomm

A voltage divider of two resistors is designed with a total resistance of the two resistors equal to 50 ohm. If the output voltage is 10% of the input voltage, what are the values of the two resistors in the circuit?

• 49.5 and 0.50 ohms

• 40 and 10 ohms

• 42.5 and 7.5 ohms

• 45 and 5 ohms

Which of the following insulators will be selected for high voltage applications?

• strain type

• disc type

• suspension type

• pin type