EE subjects

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

A lead storage battery is rated 12V. If the internal resistance is 0;01Ω, what is the maximum power that can be delivered to the load?

• 1,200 W

• 3,600 W

• 7,200 W

• 7, 800 W

The result of capacitance C1 = 6μF and C2 connected in series is 3μF. Capacitance C2 in microfarads is

• 3

• 4

• 8

• 6

Three resistors 10Ω, 15Ω and 20Ω are connected in series across a 48-V source. What is the voltage across the 15Ω resistor?

• 20V

• 16V

• 24V

• 45Ω

How many calories does an electric heater of 100W generate per second?

• 10

• 1,000

• 23.88

• 42.25

What is 1kWhr in BTU?

• 4,186

• 746

• 1,000

• None of these

A 7.5 MVA, 69/13.8kV, 3-phase transformer has 8% impedance. What is the per unit impedance at 10MVA base

• 0.24

• 0.106

• 0.06

• 0.096

What do you call the element that conducts electricity very readily?

• Semi-conductors

• conductors

• insulators

• dielectric

A 5mH pure inductance is connected in parallel with one microfarad capacitor. What frequency will the circuit be antiresonance?

• 250Hz

• 2250Hz

• 60Hz

• 100Hz

A three-terminal resistor with one or more sliding contacts which functions as an adjustable voltage divider

• Rheostat

• Bleeder resistor

• IC

• Potentiometer