Description : The method of magnetization is: (1) hammering a magnet (2) heating a magnet (3) passing direct current through it (4) passing alternating current through it
Last Answer : (1) hammering a magnet Explanation: Hammering a rod will either allow it to become slightly magnetic inlaid along a magnetic field (i.e.North - South) or demagnetize it if laid across the field lines (i.e. East-West). A current passing through a coil will produce a magnetic field.
Description : The charge of a lead-acid battery can be restored by ______. A. passing an alternating electric current through the cell B. passing a direct electric current through the cell C. adding acid to the electrolyte D. all of the above
Last Answer : Answer: B
Description : The purpose of the commutator and brushes on a DC generator is to _____________. A. transfer generated direct current voltage from the armature to the line B. convert the alternating voltage ... contact method to excite the field D. reduce sparking between the armature and the carbon brushes
Description : Rectifiers are used to convert - (1) Direct current to Alternating current (2) Alternating current to Direct current (3) high voltage to low voltage (4) low voltage to high voltage
Last Answer : (2) Alternating current to Direct current Explanation: Converting DC power from one voltage to another is much more complicated. One method of DC-to-DC conversion first converts power to AC (using a ... inverter), then uses a transformer to change the voltage, and finally rectifies power back to DC.
Description : What is the name of the device used to convert alternating cur-rent into direct current? (1) Amreter (2) Galvanometer (3) Rectifier (4) Transformer
Last Answer : (3) Rectifier Explanation: A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification.
Description : Alternating current is converted into direct current by a – (1) Transformer (2) Dynamo (3) Oscillator (4) Rectifier
Last Answer : (4) Rectifier Explanation: A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification.
Description : What is the name of the device used to convert alternating current into direct current ? (1) Ammeter (2) Galvanometer (3) Rectifier (4) Transformer
Last Answer : Rectifier
Description : A transformer works with (1) alternating current only (2) direct current only (3) both AC and DC (4) any signal
Last Answer : alternating current only
Description : Alternating current is converted into direct current by a (1) transformer (2) dynamo (3) oscillator (4) rectifier
Last Answer : rectifier
Description : In the process of magnetisation of a bar (1) The entire bulk of the bar gets magnetised (2) Only the surface of the bar gets magnetised (3) Only the ends of the bar get magnetised (4) Only some parts of the outer layers of the bar get magnetised
Last Answer : The entire bulk of the bar gets magnetised
Description : State the effect of Water hammering effect in penstock of HPS and method to reduce it.
Last Answer : Water hammering effect in penstock of HPS: When load on power plant or alternator decreases then Governor (valve) reduces discharge of water. Due to sudden reduction in water discharge causes ... helps by storing this rejected water immediately. In this way it avoids water hammer effect.
Description : In an AC generator, direct current from a separate source is passed through the windings of the rotor _____________. A. by means of slip rings and brushes B. by means of a commutator C. by means of rotating bar magnet D. to minimize the danger of arc over
Last Answer : Answer: A
Description : What is the difference between alternating current and direct current?
Last Answer : Direct current is a constant flow of electrons in one direction. Alternating current means that the current moves back and forth and transfers the electricity that way. DC is typically used with battery power and AC is used for long distance electricity transportation.
Description : In an alternating current electrical system, a low system power factor is a direct sign of _____________. A. wasted energy B. efficient operation C. a short in the exciter field windings D. an excessive number of minor system grounds
Description : Current flowing in only one direction is called ___________. A. alternating current B. omnidirectional current C. direct current D. sinusoidal current
Last Answer : Answer: C
Description : A device used in an electrical circuit to change alternating current to direct current, is known as a _____________. A. current transformer B. rectifier C. condenser D. shunt
Description : Which of the following components are used to convert alternating current produced in the generator windings to direct current? A. Armature and equalizer B. Commutator and brushes C. Rotor and interpoles D. Field and exciter
Description : The use of four diodes, in a full-wave bridge rectifier circuit, will __________. A. provide unidirectional current to the load B. allow a very high leakage current from the load C. convert direct current to alternating current D. offer high opposition to current in two directions
Description : Alternating current is converted into direct current by using –
Description : What is the device called that will separate alternating current from direct current, or that will separate alternating current of one frequency from other alternating currents of different frequencies?
Last Answer : A filter.
Description : Describe the difference between direct and alternating current.
Last Answer : Direct current is the flow of electricity or charge in one direction.. Alternative current is the flow of charge that doesn't flow in one direction.
Description : A 1000W heater is rated to operate at a direct current (DC) of 10A. If the heater is supplied alternating current (AC) for producing the same quantity of heat the value of current should be a. Iav=10A b. Irms=10A c. Ipeak=10A
Last Answer : A 1000W heater is rated to operate at a direct current (DC) of 10A. If the heater is supplied alternating current (AC) for producing the same quantity of heat the value of current should be Irms=10A
Description : A direct current passing through a wire coiled around a soft iron core is the description of a simple ____________. A. magnetic shield B. electromagnet C. piezoelectric device D. electromagnetic domain
Description : Dipoles in any electric field undergo a) Magnetism b) Electromagnetism c) Magnetisation d) Polarisation
Last Answer : d) Polarisation
Description : The ratio of intensity of magnetisation to the magnetisation force is known as (a) flux density (b) susceptibility (c) relative permeability (d) none of the above
Last Answer : (b) susceptibility
Last Answer : The magnetic materials exhibit the property of magnetisation because of spin of nucleus.
Last Answer : The ratio of intensity of magnetisation to the magnetisation force is known as susceptibility.
Description : What nails do carpenters hate hammering?
Last Answer : Fingernails
Description : Hard peening is a) Hammering the weld across the length while the joint is hot b) Hammering the weld along the length while the joint is hot c) Hammering the weld along the length while the joint is cold d) Hammering the weld across the length while the joint is cold
Last Answer : b) Hammering the weld along the length while the joint is hot
Description : The ability of a material to be formed by hammering or rolling is known as _________ a) Malleability b) Ductility c) Harness d) Brittleness
Last Answer : a) Malleability
Description : Powder metallurgy process does not make metal powder by (A) Atomisation (B) Grinding/milling (C) Hammering (D) Electrolytic deposition
Last Answer : Option C
Description : The following operation is not carried out by an plough a) sowing seeds b) breaking the clods c) crushing the soil d) hammering the soil
Last Answer : sowing seeds
Description : Which of the following statements about continuous cardiac output monitoring are true? A. Continuous cardiac output monitoring may unmask events not detected by intermittent cardiac output measurements. ... stroke volume by detecting changes in resistance to a small, applied alternating current.
Last Answer : Answer: AD DISCUSSION: Various techniques are available to measure cardiac output continuously. The advantages of continuous cardiac output monitoring, as compared with intermittent methods, are (1) ... function of the stroke volume, which then can be used to calculate the cardiac output
Description : Graph of alternating current is a A. cos wave B. tan wave C. curve D. sine wave
Last Answer : sine wave
Description : In transformer, alternating current is induced inA. primary coil B. secondary coil C. iron core D. resistor
Last Answer : primary coil
Description : The doorbell on your house requires a 12 volt alternating current. A transformer having a primary winding of 1,600 turns is to be used to step down your house's 110-volt alternating current. How many turns are there on the secondary winding?
Last Answer : ANSWER: 175 TURNS
Description : Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C ... (B) Heating only (C) Both heating and humidification (D) Evaporative cooling
Last Answer : (C) Both heating and humidification
Description : Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the (A) Hot scarfing of steel slabs (B) Mixing with blast furnace gas (C) Coke oven battery heating (D) Steel ladle drying
Last Answer : (C) Coke oven battery heating
Description : Sum of e.m.f around any loop equals A. sum of current B. sum of potential difference C. sum of resistances D. sum of charges passing through it per second
Last Answer : sum of potential difference
Description : If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is A. 500Ω B. 400Ω C. 300Ω D. 200Ω
Last Answer : 500Ω
Description : Which method, vapor phase oxidation or direct-melt process, transforms deposited material into a solid glass preform by heating the porous material without melting?
Last Answer : Vapor phase oxidation.
Description : How would the compass react if the alternating current through the conductor was a high frequency?
Last Answer : The compass needle would vibrate rapidly around the zero current point ac meter (magnetic north).
Description : When an alternating current passes through an ohmic resistance the electrical power converted into heat is?
Last Answer : When an alternating current passes through an ohmic resistance the electrical power converted into heat is true power.
Description : Can you make alternating current through a battery?
Last Answer : Yes, we can make AC through a battery using an inverter.
Description : Flemings "Left hand Rule" is associated with the effect of – (1) Electric field on current (2) Magnetic field on magnet (3) Electric field on magnet (4) Magnetic Field on current
Last Answer : (4) Magnetic Field on current Explanation: Whenever, a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, if a conductor ... conductor. In both of the phenomenon, there is a relation between magnetic field, current and force.
Description : Magnetic field can be produced by using A. permanent magnet B. electric current C. temporary magnet D. both A and B
Last Answer : permanent magnet
Description : Induced current in coil by a magnet turns it into an A. straight wire B. magnet C. ammeter D. electromagnet
Last Answer : electromagnet
Description : By accelerating the magnet inside the coil, the current in it A. increases B. decreases C. remains constant D. reverses
Last Answer : increases
Description : Flemings “Left hand Rule” is associated with the effect of (1) Electric field on current (2) Magnetic field on magnet (3) Electric field on magnet (4) Magnetic Field on current
Last Answer : Magnetic Field on current