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16 Cards in this Set
- Front
- Back
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Which of these will cause the resistance of a conductor to decrease?
A. Decrease the length or the cross-sectional area B. Decrease the length or increase the cross-sectional area C. Increase the length or decrease the cross- sectional area |
B. decrease the length or increase the cross-sectional area |
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Through which material will magnetic lines of force pass the most readily? |
B. Iron
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A 48 volt source is required to furnish 192 watts to a parallel circut consisting of three resistors of equal value. What is the value of each resistor?
A. 36 ohms B. 4 ohms C. 12 ohms |
A. 36 ohms |
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Which is correct concerning a parallel circuit?
A. Total resistance will be smaller than the smallest resistor B. Total resistance will decrease when one of the resistances is removed C. Total voltage drop is the same as the total resistance |
A Total resistance will be smaller than the smallest resistor |
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The voltage drop in a circuit of known resistance is dependent on
A. the voltage of the circuit B. only the resistance of the conductor and does not change with a change in either voltage or amperage C. The amperage of the circuit |
C. The amperage of the circuit |
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A thermal switch, or thermal protector, as used in an electric motor, is designed to
A. close the integral fan circuit to allow cooling of the motor B. open the circuit in order to allow cooling of the motor C. reroute the circuit to ground |
A. close the integral fan circuit to allow cooling of the motor |
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When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
A. The circuit breaker B. The switch C. The ground reference |
C. The ground reference |
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What is the purpose of the ground symbol used in electrical circuit diagrams?
A. to show that there is common bus for connection of the source of electrical energy to the load B. To show the source of electrical energy for the load C. To show that there is a return path for the current between the source of electrical energy and the load |
C. to show that there is a return path from the current between the source of electrical energy and the load. |
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In a P-N-P transistor application, the solid state device is turned on when the
A. base is negative with respect to the emitter B. base is positive with respect to the emitter C. emitter is negative with respect to the base. |
A. base is negative with respect to the emiter |
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In an N-P-N transistor application, the solid state device is turned on when the
A. emitter is postive with respect to the base B. base is negative with respect to the emitter C. base is positive with respect to the emitter |
C. base is positive with respect to the emitter |
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Typical application for zener diodes is as
A. full wave rectifiers B. half wave rectifiers C. Voltage regulators |
C. voltage regulators |
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Foward biasing of a solid state device will cause the device to
A. conduct via zener breakdown B. conduct C. turn off |
B. conduct |
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A lead acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2 ohms resistance.The internal resistance of the battery in this instance is
A. 0.52 ohms B. 2.52 ohms C. 5.0 ohms |
A. 0.52 ohms |
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the method used to rapidly charge a nickel cadmium battery utilizes
A. constant current and constant voltage B. constant current and varying voltage C. constant voltage and varying current |
C. constant voltage and varying current |
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The electrolyte of a nickel cadmium battery is the lowest when the battery is
A. being charged B. in a discharged condition C. under a heavy load condition |
B. in a discharged condition |
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The electrolyte of a nickel cadmium battery is highest when the battery is
A. in a fully charged condition B. in a discharged condition C. under a no load condition |
A. in a fully charged condition |
