Description : How do closed-loop capstan drive tape transports overcome the disadvantages of the open-loop drive design?
Last Answer : Closed loop capstan drive transports use more than one capstan to clamp the tape in the area around the magnetic head.
Description : A carbon resistor has the following color bands: The first band is yellow, followed by violet, yellow, and silver. What is the ohmic value of the resistor?
Last Answer : 470,000 ohms (470 kilo ohms).
Description : A carbon resistor has a resistance of 50 ohms, and a tolerance of 5 percent. What are the colors of bands one, two, three, and four, respectively?
Last Answer : The bands are green, black, black, and gold.
Description : What are the two disadvantages of carbon-type resistors?
Last Answer : 1. Change value with age. 2. Limited power capacity.
Description : . Which type of variable resistor should you select for controlling a large amount of current?
Last Answer : The rheostat.
Description : What type of resistor should be used in the circuit described in question 12?
Last Answer : A wirewound resistor.
Description : How is the applications software compatibility problem overcome
Last Answer : Some software comes in several versions so it can run under several different operating systems.
Description : How is the disadvantage of the Gramme-ring armature overcome in the drum-wound armature?
Last Answer : By winding the armature in a way that places the entire coil where it is exposed to maximum flux.
Description : Which digital data encoding method helps overcome a tape recorder’s low-frequency response problems by recording two logic levels for each incoming data bit?
Last Answer : Bi-phase level encoding.
Description : What name is given to a resistor used to replace the normal load in a circuit?
Last Answer : Dummy load or dummy antenna.
Description : A resistor is handed to you for identification with the following color code: the first band is blue, followed by gray, green, gold, and brown. What is the resistor’s value?
Last Answer : 6,800,000 ohms (6.8 mega ohms), with 5% tolerance, and a 1% reliability level.
Description : The same resistor mentioned in question 63 has a yellow fifth band. What does this signify?
Last Answer : The resistor’s chance of failure is 0.001 percent for 1000 hours of operation.
Description : What does the wattage rating of a resistor indicate?
Last Answer : Its ability to dissipate heat
Description : A tube has a transconductance of 800 mhos and a load resistor of 50 kohms. When control grid voltage varies by 6 volts, the plate voltage will vary by what amount?
Last Answer : 240 volts.
Description : If the load in question 50 requires a voltage of +90 V, what should be the value of the bleeder resistor?
Last Answer : 2 kΩ
Description : What term identifies a single resistor that represents total resistance of a complex circuit?
Last Answer : Equivalent resistor or Req.
Description : Four equal resistors are connected in parallel, each resistor has an ohmic value of 100 ohms, what is the equivalent resistance?
Last Answer : 25 ohms
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 : 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 : What is the voltage dropped by each resistor of the circuit described in question 17?
Last Answer : E1 = 60 volts. E2 = 180 volts. E3 = 240 volts.
Description : What is the power used in a circuit that has 10 amperes of current through a 10-ohm resistor?
Last Answer : 1 kilowatt.
Description : What is the time constant of the resistor and capacitor in a peak detector for pam?
Last Answer : At least 10 times the interpulse period.
Description : A circuit is to be designed in which a capacitor must charge to 40 percent of the maximum charging voltage in 200 microseconds. The resistor to be used has a resistance of 40,000 ohms. What size capacitor must be used?
Last Answer : 0.1 microfarads 40% from the graph = 0.5
Description : What is the RC time constant of a series RC circuit that contains a 12-megohm resistor and a 12-microfarad capacitor?
Last Answer : 144 seconds (t=R x C)
Description : What is the voltage drop across the resistor in an RC charging circuit when the charge on the capacitor is equal to the battery voltage?
Last Answer : Zero.
Description : At what instant does the greatest voltage appear across the resistor in a series RC circuit when the capacitor is charging?
Last Answer : At the instant of the initiation of the action.
Description : What factors determine the value of the multiplier resistor?
Last Answer : The current required for full-scale deflection, and the range of the voltage to be measured.
Description : The arrow drawn through the resistor shown in the illustration indicates that it is _____________. EL-0086 A. for use in low power applications B. a carbon composition type C. a wire-wound type D. one whose resistance is variable
Last Answer : Answer: D
Description : What are the primary disadvantages of the magic-T?
Last Answer : Low power-handling capability and power losses
Description : What are the two main disadvantages of an LC capacitor filter?
Last Answer : Cost and size of the inductor.
Description : What are two disadvantages of procedure oriented languages?
Last Answer : They require more space in memory and they process data at a slower rate than symbolic languages.
Description : What are some disadvantages of operating a transmitter at or near the muf?
Last Answer : Frequent signal fading and dropouts.
Description : What are some disadvantages of operating transmitters at or near the luf?
Last Answer : Signal-to-noise ratio is low and the probability of multipath propagation is greater.
Description : . What are the two main disadvantages of an LC capacitor filter?
Last Answer : Cost of the inductor and size of the inductor.
Description : List the three disadvantages of the air coaxial line
Last Answer : Expensive to construct, must be kept dry, and high frequency losses limit the practical length of the line.
Description : What are the two primary disadvantages of a two-wire open line?
Last Answer : High radiation losses and noise pickup.
Description : What is one of the major disadvantages of multilayer printed circuit boards?
Last Answer : Difficulty of repair of internal connections.
Description : What are the disadvantages of point-to-point wiring?
Last Answer : "Rat's nest" appearance and unwanted interaction, such as capacitive and inductive effects.
Description : There are two types of tape transport configurations, open loop capstan drive and closed-loop capstan drive. What are two major disadvantages of open-loop capstan drive tape transports?
Last Answer : a. Only operates in one direction. b. The tape tension and head-to-tape contact can vary.
Description : What are two disadvantages of the take-up control reeling system?
Last Answer : a. It only works in one direction. b. The tape tension varies as the supply reel unwinds, which can cause damage during starts and stops.
Description : What are two disadvantages of using a recorder’s erase head to erase data recorded on a magnetic tape?
Last Answer : Using an erase head is slow, and it may not completely erase the tape.
Description : What are the disadvantages of radiotelephone communications?
Last Answer : Static, enemy interference or a high local noise level.
Description : Name two major disadvantages of transistors.
Last Answer : Sensitive to heat and minor overloads.
Description : What are the disadvantages of the parasitic array?
Last Answer : Their adjustment is critical and they do not operate over a wide frequency range.
Description : What are some disadvantages of the end-fire array?
Last Answer : Extremely low radiation resistance, confined to one frequency, and affected by atmospheric conditions.
Description : The sequence of bands marked on a carbon resistor is yellow , red orange and silver. What is its (a) resistance and (b) tolerance ?
Last Answer : The sequence of bands marked on a carbon resistor is yellow , red orange and silver. What is its (a) resistance and (b) tolerance ?
Description : A voltage of 30 V is applied across a colour coded carbon resistor with first, second and third rings of blue, black and yellow colurs. What is the cu
Last Answer : A voltage of 30 V is applied across a colour coded carbon resistor with first, second and ... What is the current flowing through the resistor ?
Description : Copper and carbon wires are connected in series and the combined resistor is kept at `0^(@)C`. Assuming the combined resistance does not vary with tem
Last Answer : Copper and carbon wires are connected in series and the combined resistor is kept at `0^(@)C`. Assuming the combined ... C)` A. 4 B. 8 C. 6 D. 2
Description : A carbon film resistor has cololur code green, black, violet, gold. The value of the resistor is
Last Answer : A carbon film resistor has cololur code green, black, violet, gold. The value of the resistor is A. `50M ... `500 pm 5%M Omega` D. `500 pm 10%M Omega`
Description : The resistance of a carbon resistor of colour code Red-Red Green Silver is (in `k Omega`)
Last Answer : The resistance of a carbon resistor of colour code Red-Red Green Silver is (in `k Omega`) A. `22 00 pm 5%` ... pm 10%` C. `220 pm 10%` D. `220 pm 5%`