AS112 Practice Quiz #1 Flashcards
The potential difference between two conductors which are insulated from each other is measured in
volts.
Which is correct in reference to electrical resistance?
If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.
When calculating power in a reactive or inductive ac circuit, the true power is
less than the apparent power.
A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watt light is measured, it will be
equal to the voltage across the 20-watt light.
How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each?
25.23 amperes.
How much power must a 24-volt generator furnish to a system which contains the following loads? UNIT RATING One motor (75 percent efficient) 1/5 hp Three position lights 20 watts each One heating element 5 amp One anticollision light 3 amp (Note: 1 horsepower = 746 watts)
450 watts.
Which of the following logic gates will provide an active high out only when all inputs are different?
XOR.
In a P-N-P transistor application, the solid state device is turned on when the
base is negative with respect to the emitter.
A circuit has an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohm resistor. What is the voltage drop across the 10-ohm resistor?
10 volts.
The term that describes the combined resistive forces in an ac circuit is
impedance.
When referencing resistance in a parallel DC circuit, which of the following statements is true?
The total current is equal to the sum of the currents through the individual branches of the circuit.
What is the basic unit of electrical quantity?
Coulomb.
Electrostatic fields are also known as
Electrostatic fields.
The basis for transformer operation in the use of alternating current is mutual
inductance.
If three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28-volt circuit, how much current will flow through the 3-ohm resistor?
0.93 ampere.
What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively?
.170 uF.
A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor?
24 volts.
In a parallel circuit with four 6-ohm resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?
24 volts.
Convert farads to picofarads by:
multiplying farads by 10 to the power of 12.
What may result if water is added to a nickel-cadmium battery when it is not fully charged?
Excessive spewing is likely to occur during the charging cycle.
In an N-P-N transistor application, the solid state device is turned on when the
base is positive with respect to the emitter.
Which of these will cause the resistance of a conductor to decrease?
Decrease the length or increase the cross-sectional area.
Which is correct in reference to electrical resistance?
If one of three bulbs in a parallel lighting circuit is removed, the total resistance of the circuit will become greater.
In nickel-cadmium batteries, a rise in cell temperature
causes a decrease in internal resistance.
A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require? (Note: 1 horsepower = 746 watts)
1,000 watts.
Diodes are used in electrical power supply circuits primarily as
rectifiers.
The voltage drop in a circuit of known resistance is dependent on
the amperage of the circuit
Forward biasing of a solid state device will cause the device to
conduct.
The purpose of providing a space underneath the plates in a lead acid battery’s cell container is to
prevent sediment buildup from contacting the plates and causing a short circuit.
When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
The ground reference.
