Description : Define the metal solvent action that takes place when copper conductors are soldered together.
Last Answer : The solder dissolves a small amount of the copper, which combines with the solder forming a new alloy; therefore, the joint is one common metal.
Description : Different components of the motherboard of a PC unit are linked together by sets of parallel electrical conducting lines. What are these lines called? A) Conductors B) Buses C) Connectors D) Consecutives
Last Answer : Answer : B
Description : Different components on the motherboard of a PC processor unit are linked together by sets or parallel electrical conducting lines. What are these lines called? a. Conductors b. Buses c. Connectors d. Connectively
Last Answer : Buses
Last Answer : b. Buses
Description : As shown in the illustration, which listed action will occur first when push button 'Q' is depressed? EL-0017 A. Contacts 'H-1', 'H-2' and 'H-3' close. B. Contact 'H-4' closes. C. Operating coil 'C' energizes. D. Switch 'R' opens.
Last Answer : Answer: C
Description : If the permeability of the core of a coil increases, what happens to (a) inductance and (b) true power in the circuit?
Last Answer : (a) Inductance increases; (b) true power decreases.
Description : What term is used to describe the ability of a radar system to distinguish between targets that are close together?
Last Answer : Target resolution
Description : Explain why the water molecule has a bent shape and a bond angle less than 109.5° The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Last Answer : The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Description : What happens when the poles of the two magnets come close together?
Last Answer : What is the answer ?
Description : What amount of flat tape or round cord is required to single lace a group of conductors?
Last Answer : Two and one-half times the length of the longest conductor in the group.
Description : Besides presenting a neat appearance and supporting each other, what is the other purpose for lacing conductors?
Last Answer : To aid in tracing the conductors when alterations or repairs are required.
Description : Why are small-wattage soldering irons not used to solder large conductors?
Last Answer : Although its temperature is as high as the larger irons, it does not have thermal inertia.
Description : What types of losses cause the dielectric material between the conductors to be heated?
Last Answer : Dielectric losses.
Description : State the reason for the establishment of a "unit size" for conductors.
Last Answer : To allow comparisons between conductors of different sizes and resistance.
Description : To minimize magnetic field interaction between electrical conductors in physical proximity, it is best to keep them ___________________. A. parallel and as close as possible to each other B. at right angles ... practicable from each other D. at right angles and as far as practicable from each other
Last Answer : Answer: D
Description : Metal are good conductors, because (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface
Last Answer : they contain free electrons
Description : In conductors, the E and H vary by a phase difference of a) 0 b) 30 c) 45 d) 60
Last Answer : c) 45
Description : Overhead lines generally use (a) copper conductors (b) all aluminium conductors (c) A.C.S.R. conductors (d) none of these
Last Answer : (c) A.C.S.R. conductors
Description : ACSR (Aluminium Conductor Steel Reinforced) are used as (A) over head transmission lines. (B) super conductors. (C) fuse (D) underground cables.
Last Answer : (A) over head transmission lines.
Description : Bundled conductors are mainly used in high voltage overhead transmission lines to (a) Reduce line loss (c) Reduce corona (b) Reduce harmonics (d) Increase strength
Last Answer : Bundled conductors are mainly used in high voltage overhead transmission lines to Reduce corona
Description : Hollow conductors are used in the transmission lines to: (1) Improve heat dissipation (2) Reduce corona loss (3) Reduce skin effect (4) Reduce the line inductance
Last Answer : Hollow conductors are used in the transmission lines to: Reduce corona loss.
Last Answer : Copper conductors are generally used for transmission lines because it has longer life and high conductivity.
Description : When is the maximum voltage induced into a stator coil?
Last Answer : When the rotor coil is aligned with the stator coil.
Description : If two coils are wound on a single iron core, what will a change in current in one coil cause in the other coil?
Last Answer : A change in inductance.
Description : Which oscillator uses a tickler coil for feedback?
Last Answer : Armstrong.
Description : How many commutator segments are required in a two-coil generator?
Last Answer : Four
Description : Why is no emf induced in a rotating coil when it passes through the neutral plane?
Last Answer : No flux lines are cut.
Description : What rule should you use to determine the direction of induced emf in a coil?
Last Answer : The left-hand rule for generators.
Description : What is the effect of current flow through the coil in a d’Arsonval meter movement?
Last Answer : A magnetic field is generated around the coil and the attraction of this field with the permanent magnet causes the coil to move
Description : What is the primary disadvantage of the pointer arrangement for indicating coil rotation?
Last Answer : Coil balance.
Description : In a galvanometer, what two methods are used to indicate the amount of coil rotation?
Last Answer : The pointer arrangement and the light and mirror arrangement.
Description : What physical component of a galvanometer provides the restoring force for the coil?
Last Answer : Phosphor bronze ribbons.
Last Answer : he pointer arrangement and the light and mirror arrangement.
Description : (True or False) The larger the current required to produce full-scale deflection of the meter coil, the better the sensitivity of the meter.
Last Answer : False.
Description : What component supplies restoring force to the coil of the D’Arsonval meter movement?
Last Answer : Hairspring.
Description : What component of the D’Arsonval meter movement completes the circuit for current flow to the coil?
Description : What is the mathematical formula for computing the output voltage from a moving coil in a magnetic field?
Last Answer : 8. e = Emax sine θ.
Description : What happens to resistance of conductors when temperature rises?
Last Answer : For conductors an increase in temperature will cause their resistance to increase.
Description : When the motor shown in the illustration is running and the stop button is pushed, which of the following statements will hold true? EL-0010 A. Coil 'M' will now be energized. B. Coil 'CR' will now be energized. C. Contact 'M' will close as contact 'CR' opens. D. Contacts 'M' and 'CR' will open.
Description : A shading coil used in an AC magnetic controller, functions to _____________. A. reduce vibration and noise in the contactor B. prevent flux buildup in the operating coil C. eliminate arcing when the contacts close D. energize the operating coil and 'pull in' the contacts
Last Answer : Answer: A
Description : For a shortened vertical antenna, where should a loading coil be placed to minimize losses and produce the most effective performance? A. As low as possible on the vertical radiator B. Near the center of the vertical radiator C. As close to the transmitter as possible D. At a voltage node
Last Answer : B. Near the center of the vertical radiator
Description : For the close coil helical spring of the maximum deflection is (A) WD3n/d 4N (B) 2WD3n/d 4N (C) 4W²D3n/d 4N (D) 8WD3n/d 4N
Last Answer : (D) 8WD3n/d 4N
Description : The stiffness of the close coil helical spring is (A) d 4N/8D 3n (B) d 4N/4D 3n (C) 4D 3N/d 4n (D) 8D 3N/d 4n
Last Answer : (A) d 4N/8D 3n
Description : Pick up the correct statement from the following: (A) A wire wound in spiral form, is called a helical spring (B) The pitch of a close coil spring, is very small (C) The angle made by the coil with horizontal, is called the angle of helix (D) All the above
Last Answer : (D) All the above
Description : A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is (A) 4WD²n/d 4N (B) 4W²Dn/d 4N (C) 4W²D3n/d 4N (D) 4W²D3n²/d 4N
Last Answer : (C) 4W²D3n/d 4N
Description : A close coil helical spring when subjected to a moment M having its axis along the axis of the helix (A) It is subjected to pure bending (B) Its mean diameter will decrease (C) Its number of coils will increase (D) All the above
Last Answer : (A) It is subjected to pure bending
Description : A spring used to absorb shocks and vibrations is (a) Close-coil helical spring (b) Open coiled helical spring (c) Spiral spring (d) Leaf spring
Last Answer : (d) Leaf spring
Description : Initial gap between two turns of a close coil helical tension spring should be a. 0.5 mm b. based on the maximum deflection c. 1 mm d. zero
Last Answer : d. zero