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NLC #3 +5 volts and ground What voltage level exists in the 7400-serise of 1C chips? 0 and a logic 1 state The majority of simple electronics circuits are based upon a logic... 0000 to 9999 A four decade counter can count from... 1, 0, 1 and 0 If the two inputs to a 2-input AND, NAND, OR, and NOR gate are both at logic 1, the outputs from the four gates are... 1.25 Assume that a length of wire having a resistance of 20 ohms is cut into four equal lengths. The four resistors then are connected in parallel with each other and their resistance measured. The resistance, in ohms, will be... 1.25 A galvanometer has a resistance of 50 ohms and requires 0.05 amperes for full scale. The voltage required for half-scale deflection is... 1 second When R=I megohm and C=I microfarad, the RC time constant has a value of... 2.56 The current in a coil having an inductance of 32 millihenries increases in magnitude from 2 to 6 amperes in 0.05 second. The voltage of self-induction will equal.. 4 Two 50 watt, 120 volt heaters are connected in parallel to a 120 volt DC line. The power consumption is now X times as great as it would be if they were connected in series. Assuming no change in resistance, X will be... 5 A storage cell is connected in series with a resistance of 0.3 ohms. If the resistance of the cell is 0.2 ohms and its EMF is 2.5 volts, the current, expressed in amperes, in the circuit is... 5 A wire 50 feet long has a resistance of 10 ohm. The resistance of 25 feet of this wire is ___ ohms. 6 Two electrical condensers have capacitances of 9 and 18 microfarads, respectively, are connected in series. The capacitance, in microfarads, of the two connected together will be... Upgrade to remove ads Only $35.99/year 6 Three resistors, each of 12 ohms, connected in parallel with each other, are connected in series to a resistor of 6 ohms and to a 60 volt source. The current, in amperes, through the 6 ohms resistor will be... 10, 10 Of the following, the STRONGEST electromagnet is one having ____ amperes and ____ turns. 15 Eight Christmas tree lamps are connected in series on a 120 volt circuit. The voltage across each lamp is... 15 Four resistors of 60 ohms each are connected in parallel. Their combined resistance, in ohms, is... 17.5 A battery has an open circuit voltage of 20 volts and an internal resistance of 0.25 ohm. When it delivers a current of 10 amperes, the terminal voltage will be... 30 Resistors of 5, 10, 15, and 30 ohms are connected in series to a battery. The GREATEST voltage drop will be across the resistor of ____ ohms. 115 A shunt motor having an armature whose resistance is 0.5 ohm is attached to a 120 volt supply. The armature current at full speed is 10 amperes. The back EMF, in volts, will be... 141 A voltmeter showed a reading, when connected to a circuit carrying a sinusoidal alternating current, of 100 volts (RMS value). The MAXIMUM instantaneous voltage was... 400 The combined resistance, in ohms, of four 100-ohm resistors connected in series is... 400 The MOST economical 0.1 mfd condenser to be used, without danger of shorting, on a 250 volt AC line is one whose DC working voltage is rated at... Upgrade to remove ads Only $35.99/year The 7490 is a decade counter, whereas the 7493 is a binary counter What is the difference between a 7490 and a 7493 counter? admittance The current in an alternating current circuit is equal to the voltage multiplied by the... All of the above The term "to enable" a gate is the opposite of which of the following terms? (To close a gate; To disable a gate; To block a gate) AND gate For which type of gate is the following definition CORRECT? A binary circuit with two or more inputs and single output, in which the output is a logic 1 only when all inputs are logic 1, and the output is logic 0 if any one of the inputs is logic 0. attract each other Two adjacent turns in a helical coil through which a constant current is passing through will... both capacitative and inductive reactance As the frequency of an alternating EMF ni a given circuit increases, the current in the circuit at first increases, then decreases. The circuit contains... can be transmitted more economically One great advantage of AC over DC is that AC... capacitance has been increased A variable electrical condenser of the type used in radio sets is completely immersed in oil whose dielectric strength is 3.5. As compared to its former state, its... charge When several capacitors are connected in series and to a source of direct current, each capacitor must have the same... charge a storage battery Only direct-current electricity may be used to... Upgrade to remove ads Only $35.99/year charge storage batteries Direct current is necessary in order to... curve in a vertical plane An electron stream sent horizontally through a magnetic field whose lines of force are horizontal and at right angles to the electron stream will... electrons A flow of electricity in a copper wire consists of a movement of... expands at the same rate as glass The alloy used for lead-in wires of electric lamps is chosen PRINCIPALLY because it... F/2 If the capacitance in an oscillator circuit of frequency F is increased fourfold, the frequency of the oscillator becomes... four gates The 7400, 7402, 7408, and 7432 IC chips each contain... frequency In speaking of 60-cycle alternating current, the term 60 cycle refers to... frequency In describing an alternating current, the term 60 cycles per second refers to the... from a logic 0 to a logic 1 and back to logic 0 A clock pulse is a transition... galvanometer Very small electric currents are measured by a(n)... Upgrade to remove ads Only $35.99/year A gate is essentially a one-way device, whereas a switch is a two-way device. A gate and a switch differ in which of the following ways? higher current The wire in the primary of a step-up transformer is usually thicker than the wire in the secondary because the primary has the... highest wattage In a parallel circuit, the device with the LOWEST resistance has the... high; series A voltmeter is a galvanometer that has its movable coil connected with a _____ resistance in _____ Inverted input date A gating input of logic 0 to a 2-input NOR gate will allow what type of digital information to appear at the output of the gate? is easily magnetized and demagnetized The core of an electromagnet is made of soft iron because soft iron... logic 1 and logic 0 If the two inputs to a 2-input AND gate and a 2-input NOR gate are left unconnected, the outputs from these two gates are, respectively... logic 1, logic 0, logic 0, logic 1 In the truth tables for a 2-input AND, NAND, OR, and NOR gate, the unique output state is, respectively... Logic 1 state A gating input logic 0 to a 2-input NAND gate will allow what type of digital information to appear at the output of the gate? makes sure that the output from the switch can be controlled to produce a single clock pulse at a time When one debounces a SPDT switch, he... monostable multivibrator The 74121-IC chip is a... moved back by the spring The armature in an electric doorbell moves away from the magnet because it is... NAND When one inverts the output from an AND gate, he converts it into a(n) ____ gate. NAND The 7400, 7420, 7430 IC chips are all ____ gates. negative trailing In a positive clock pulse, the transition from logic 1 to logic 0 occurs on the ____ edge not operate A condenser is connected in series with a 25-watt lamp to a 120-volt DC source. The lamp will... Peltier When a current is made to flow in a circuit consisting of two unlike metals, heat is absorbed at one of the junctions and given off at the other junction. This phenomenon is known as the ____ effect. reverses the direction of the current in the armature coils A commutator on a direct-current motor... the same as The current in a fuse is ____ the current in the circuit it protects. the same as in A In circuit A, one ampere of AC flows for 1 hour and generates X calories. In circuit B, one ampere of DC flows for 1 hour. The heat generated in circuit B is... the same as the field current In a series would DC electrical generator, the current in the line is... store electricity A condenser is used to... transformer All of the following devices can be operated from a steady direct current EXCEPT a... transformer Of the following (flatiron, heating coil, lamp, transformer), the device that should NOT be connected to a DC source is a... transformer Steady direct current cannot be used to operate a(n)... Two A common cathode display has the following inputs to its segments: C,F=0 and A,B,D,E,G=1 ; What dose the display indicate? two, three, four, eight The 7400, 7420, and 7430 IC chips have gates that have, respectively, the following numbers of inputs... voltage between cathode and anode The penetrating power of the x-rays produced by a Coolidge x-ray tube can be increased by increasing the.. volts The potential difference in a circuit is measured in... zero In an AC circuit in which the current and voltage are out of phase by 90 deg, an ammeter reads 2 and a voltmeter reads 120. The power expended by this circuit, in watts, equals...