Description : What are the voltage, current, and time delay ratings for a fuse with the designation
Last Answer : a. 125 volts or less, 1.5 amperes, delay b. 250 volts or less, 1/8 ampere standard
Description : What does the voltage rating of a fuse indicate?
Last Answer : The ability of the fuse to quickly extinguish the arc after the fuse element melts and the maximum voltage that cannot jump across the gap of the fuse after the fuse opens.
Description : What does the current rating of a fuse indicate?
Last Answer : The amount of current the fuse will allow without opening.
Description : How are the four distinct layers of the ionosphere designated?
Last Answer : D, E, F1, and F2 layers.
Description : What is meant by diode ratings?
Last Answer : They are the limiting values of operating conditions outside which operations could cause diode damage.
Description : what should be the minimum wattage ratings of R 3 and R 5 ?
Last Answer : R3 = 2 watts; R5 = 6 watts.
Description : What are the three time delay ratings for circuit breakers?
Last Answer : Instantaneous, short time delay, and long time delay.
Description : What is the function of a fuse wire? (a) To prevent an unduly high electric current from passing through a circuit (b) To increase the current supply (c) To decrease the current supply (d) To stabilise the voltage
Last Answer : Ans:(a)
Description : In the illustrated motor controller, the motor fails to start. A voltmeter reading between 1 and 6 reads line voltage, while the voltmeter reading between 2 and 6 reads 0 VAC. The problem is __________. EL- ... in the 'M' coil, 'Ma' contact/start switch or overload contacts D. fuse '10a' is blown
Last Answer : Answer: B
Description : A fuse that blows often should be replaced only with a fuse of _____________. A. the recommended current and voltage rating B. higher current and voltage rating C. higher current and lower voltage rating D. lower current and higher voltage rating
Last Answer : Answer: A
Description : A fuse is placed in series with the cireuit to protect against a. high power b. high voltage c. high current d. over heating
Last Answer : d. over heating
Description : How do we select a cable for a machine as per standards? Is there is any standard to select a cable as per voltage, or as per KVA and as per amps ratings?
Last Answer : Cable size depends upon current carrying capacity and voltage to withstand, to select cable size we must have knowledge of load of machine and operating voltage
Description : Two transformers with identical voltage ratings are working in parallel to supply common load. The percentage impedance of one transformer is higher compared to that of other. The load sharing ... respective impedance (4) Depend on the resistance to leakage reactance ratio of each transformer
Last Answer : Two transformers with identical voltage ratings are working in parallel to supply common load. The percentage impedance of one transformer is higher compared to that of other. The load sharing between the two transformer will: Be inversely proportional of their respective impedance
Description : If the fuse shown on the schematic (figure 3-10) opens, what lights will operate?
Last Answer : Only the brake lights.
Description : List the safety precautions to be observed when replacing a fuse.
Last Answer : Be sure the power is off in the circuit and the circuit is discharged before replacing a fuse. Use an identical replacement fuse if possible. Remove any corrosion from the fuseholders before replacing the fuses.
Description : What two things should you check before replacing a fuse?
Last Answer : Check for the proper type of replacement fuse and proper fit.
Description : How could you check a 1/500-ampere fuse with an ohmmeter?
Last Answer : Use a resistor in series with the fuse when you check it with the ohmmeter.
Description : You have just checked a 1/500-ampere fuse with an ohmmeter and find it is open. Checking the replacement fuse shows the replacement fuse is open also. Why would the replacement fuse indicate open?
Last Answer : The ohmmeter causes more than 1/500 ampere through the fuse when you check the fuse, thus it opens the fuse.
Description : You have just checked a fuse with an ohmmeter and find that the fuse is shorted. What should you
Last Answer : Put it back in the circuit. A good fuse will have zero ohms of resistance.
Description : What are three methods for determining if a fuse is open?
Last Answer : Visual inspection, indicators, and using a meter
Description : What is the new military designation for a fuse with the old military designation F05A20ROB?
Last Answer : F05B32V20A.
Description : Give an example of a device you could protect with each type of time delay fuse.
Last Answer : Delay-Motors, solenoids, or transformers. Standard Automobiles, lighting or electrical power circuits. Fast-Delicate instruments or semiconductor devices.
Description : Current ratings of MCB for Air conditioners is generally used as _________. A. 10/15 Amp B. 5/10 A C. 20/25 Amp D. none of these
Last Answer : Current ratings of MCB for Air conditioners is generally used as 10/15 Amp.
Description : What is the factor of safety used for current ratings in a power installation?
Last Answer : 2 is the factor of safety used for current ratings in a power installation.
Description : What is the name of the device that provides an increase in current, voltage, or power of a signal without appreciably altering the original signal?
Last Answer : Amplifier.
Description : Which quantity (voltage or current) determines the intensity of an electrical shock?
Last Answer : Current.
Description : Circuits which maintain constant voltage or current outputs are called dc voltage or dc current ___.
Last Answer : Regulators.
Description : . A non-resonant line is a line that has no standing waves of current and voltage on it and is considered to be flat. Why is this true?
Last Answer : The load impedance of such a line is equal to Z0.
Description : How does transit time affect the relationship of the grid voltage and the plate current at high frequencies?
Last Answer : Transit time causes the grid voltage and plate current to be out of phase
Description : What is the relationship of current to voltage in a circuit?
Last Answer : current increases as voltage increases.
Description : Current leads voltage by 90° (ICE)
Last Answer : Current leads voltage by 90° (ICE)
Description : What is the phase relationship between current and voltage in an inductor?
Last Answer : Current lags voltage by 90° (ELI).
Description : how is (a) the current through R2 and (b) the voltage drop across R2 computed?
Last Answer : (a) By adding the bleeder current (IR1) and the current through load 1(b) By subtracting the voltage of load 1 from the voltage of load 2.
Description : If the source voltage for the voltage divider in question 50 supplies 150 volts, what is the total current through the voltage divider?
Last Answer : 495 mA.
Description : If a voltage divider is required for a load that will use 450 mA of current, what should be the value of bleeder current?
Last Answer : 45 mA rule-of-thumb.
Description : A series circuit consists of two resistors in series. R1 = 25 ohms and R2 = 30 ohms. The circuit current is 6 amps. What is the (a) source voltage, (b) voltage dropped by each resistor, (c) total power, and (d) power used by each resistor?
Last Answer : (a) 330 volts. (b) E1 = 150 volts. E2 = 180 volts. (c) 1.98 kilowatts. (d) P1 = 900 watts. P2 = 1.08 kilowatts component but in a parallel circuit total current divides among the available paths.
Description : What would the source voltage (ES) in figure 3-39 be if the current through R2 were 2 milliamps?
Last Answer : 60 volts.
Description : If the current was increased to 4 amps, what would be the voltage drop across each resistor in the circuit described in question 17?
Last Answer : E1 = 80 volts. E2 = 240 volts. E3 = 320 volts
Description : A series circuit consisting of three resistors has a current of 3 amps. If R1 = 20 ohms, R2= 60 ohms, and R 3 = 80 ohms, what is the (a) total resistance and (b) source voltage of the circuit?
Last Answer : (a) 160 ohms. (b) 480 ohms
Description : Using the graph in figure 3-7, what is the approximate value of current when the voltage is 12.5 volts?
Last Answer : 1.25 amperes.
Description : According to Ohm’s law, what happens to circuit current if the applied voltage (a) increases, (b) decreases?
Last Answer : (a) Current increases (b) Current decreases
Description : How does the current-diode detector differ from the voltage-diode detector?
Last Answer : The current-diode detector is in parallel with the input and load.
Description : What is a disadvantage of a direct-current system with respect to supply voltage?
Last Answer : the dc voltage must be generated at the level required by the load.
Description : What type of meter movement reacts to voltage rather than current?
Last Answer : Electrostatic.
Description : How is it possible to use a current sensitive meter movement to measure voltage?
Last Answer : Since the resistance of a meter movement remains the same as the pointer is deflected, the amount of current through the movement is proportional to the voltage applied. Therefore, only the scale of the movement must be changed.
Description : What is the term used to identify the points of minimum current and minimum voltage on an antenna?
Last Answer : Current and voltage nodes.
Description : What is the term used to identify the points of high current and high voltage on an antenna?
Last Answer : Current and voltage loops.
Description : Which of the following precautions should be taken when a blown fuse, rated at 10 amperes, is replaced? A. Short out the fuse before removing it from the circuit. B. Use needle-nose pliers to ... D. Fuses of 10 ampere rating and less are virtually harmless when energized and may be handled freely.
Last Answer : Answer: C
Description : If a voltage tester is being used to check for defective fuses in the circuit, shown in the illustration, which of the readings will indicate that fuse #2 is open? EL-0062 A. C-B full voltage B. A-D full voltage C. A-D no voltage D. C-B no voltage
Description : If fuse #1 shown in the illustration is defective, a voltage tester connected across points 'C' and 'B' will ____________. EL-0062 A. show a reading of 55 volts B. show full line voltage ... C. give positive indication that fuse #2 is good D. give positive indication that fuse #1 is defective
Last Answer : Answer: D