Review EE

Given the following expressions:

v = 120 sin (377t + 30ᴼ) volts

i = 3 sin (377t + 60ᴼ) amps

Determine the average power.

• 155.88 watts

• 90 watts

• 103.92 watts

• 311.77 watts

An impedance coil having a resistance and inductance of 2-Ω and 1.5-mH respectively is connected in series with a capacitor. Calculate the value of capacitance if the circuit will operate at resonance. The voltage source is 220-volts, 4.5-kHz.

• 341.95 nF

• 833.92 nF

• 652.39 nF

• 256.43 mF

A 10-hp, 3 phase induction motor is connected to a balanced source of 220 volts, 60 Hz. If the efficiency and power factor of the motor is 85% and 91% respectively, determine the total apparent power.

• 8776.47

• 9644.47

• 8197.8

• 4238.68

Two watt-meters connected to measure power read W1 = 30kW and W2 = 55kW. Determine the total power.

• 19.41

• 85

• 25

• 147.22

Two wattmeter are used to measure the power drawn by a balanced 3-phase, wye connected load. If wattmeter A and B read 3,200 watts and 1,500 watts respectively, calculate the load power factor.

• 0.707

• 0.866

• 0.85

• 0.92

What does a voltmeter indicate?

• Total current

• Coulombs per second

• Potential Difference

• Resistance per meter

A meter device that tests insulation resistance is the:

• Megohmmeter

• Transistor checker

• Gauss meter

• Voltage tester

The generated emf in a dc generator is directly proportional to

• Flux

• Speed

• Both a and b

• parallel paths

Two 10 ohm resistances are connected in parallel. The two are then connected in series with a 5 ohm resistance. If then connected across a 24 volt battery, find the voltage across the 5 ohm resistor.

• 12 volts

• 24 volts

• 9 volts

• 15 volts

Two charges of 2x10^-5 C and 3x10^-6 C are placed 10 cm apart. Find the force in kg on each charge?

• 5.5 kg

• 7.7 kg

• 10 kg

• 2.25 kg