Description : The output from a full wave rectifier is (a) A pulsating uni-directional current (b) A DC voltage (c) Zero (d) An AC voltage
Last Answer : a) A pulsating uni-directional current
Description : One diode of a full-wave rectifier has burned out in a shorted condition. Therefore, the output will be ____________. A. zero B. a rectified half-wave C. a rectified full-wave D. equal to the AC input
Last Answer : Answer: D
Description : A full-wave rectifier has one diode burned out in an open condition, what will be the output characteristic of the device? A. Zero B. Half-wave rectified C. Full-wave rectified D. Equal to the AC input
Last Answer : Answer: B
Description : The most common source of excitation for synchronous motors is a/an ______________. A. stepup transformer B. half-wave rectifier C. DC supply D. AC supply
Last Answer : Answer: C
Description : An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)
Last Answer : Solution:
Description : The illustrated device is a _______. EL-0064 A. full wave bridge rectifier B. half wave bridge rectifier C. solid state voltage regulator D. direct current (DC) filter
Last Answer : Answer: A
Description : The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be • 12.1 volt • 1.21 volt • 0.482 volt • 4.82 volt
Last Answer : The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be 12.1 volt
Description : operation of half wave rectifier type AC Voltmeter.
Last Answer : Half-wave Rectifier Voltmeter The d'Arsonval meter movement only responds to the average or dc value of the current through the moving coil. In order to measure alternating ... ) input voltage signal alternating signal needs to be rectified first by using diode rectifier to produce
Description : An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
Last Answer : An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V
Description : Which component is mainly used in a DC generator: a.slip ring b. commutator c. magnet d. coil
Last Answer : b. commutator
Description : Explain what happens if a DC motor is fed with AC supply
Last Answer : Motor will run at low speed, sparking at brushes, heat due to eddy current will finally burn the motor.
Description : What do we use for welding on ships? AC or DC?
Last Answer : Ask E/O on your ship.
Description : The process of conversion of AC into DC is called (a) Amplification (b) rectification (c) purification (d)magnification
Last Answer : (b) rectification
Description : The only difference between construction of DC generator and Ac generator is that of: a. carbon brush b. Bar magnet c. electromagnet d. Horseshoe magnet
Last Answer : b. Bar magnet
Description : Which of the following converts electric energy into mechanical energy: a. Transformer b. DC generator c. Motor d. AC generator
Last Answer : d. AC generato
Description : Define : i) Average value ii) RMS value of an AC Wave.
Last Answer : i) Average value: The average value is defined as the average of all instantaneous values during one alternation . That is, the ratio of the sum of all considered instantaneous values to the ... as produced by the alternating current when flowing through the same resistance for the same time.
Description : Under ideal conditions, the collector current is (a) Equal to base current (b) Nearly equal to emitter current (c) Less than base current (d) always zero
Last Answer : (b) Nearly equal to emitter current
Description : In the plane of AC generator coil is parallel to the field, then emf induced in coil is: a. maximum b. minimum c. zero d. intermediate
Last Answer : b. minimum
Description : As shown in the illustration, the circuit has been on the line for several days when component 'E1' burns out. The operator receives an alarm, switches over 'B' to energize the standby ... than required for the circuit therefore limiting the current through the alarm relay which will not pick up
Description : The standard reference antenna forthe directive gain isthe a. infinitesimal dipole b. isotropic antenna c. elementary doublet d. half-wave dipole
Last Answer : b. isotropic antenna
Description : Impedance inversionmaybe obtainedwith a. a short-circuited stub b. an open-circuited stub c. a quarter-wave line d. a half-wave line
Last Answer : c. a quarter-wave line
Description : The number of diodes used in bridge rectifier circuit is (a) 4 (b) 3 (c) 2 (d)
Last Answer : (a) 4
Description : Which is the most important building block of electronic devices? (a) Diode (b) p-n junction (c) transistor (d) rectifier
Last Answer : b) p-n junction
Description : The value of ∈r for various dielectrics is always: (a) Larger than unity (b) Less than unity (c) Equal to unity (d) None of above
Last Answer : (a) Larger than unity
Description : The device which converts AC to DC is (1) Oscillator (2) Amplifier (3) Rectifier (4) None of these
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 ... serving as components of DC power supplies and high-voltage direct current power transmission systems.
Description : A silicon controlled rectifier (SCR) is a solid state device used to change ________________. A. DC to AC and control relatively low load current B. AC to DC and control relatively high load ... to AC and control relatively high load current D. AC to DC and control relatively low load current
Description : List three meter movements that can measure either ac or dc without the use of a rectifier.
Last Answer : Electrodynamic, moving vane, and hot-wire or thermocouple.
Last Answer : Rectifier
Description : Which rectifier can convert AC to DC? A. Half wave rectifier B. Full wave rectifier C. Bridge wave rectifier D. All of these
Last Answer : Which rectifier can convert AC to DC? A. Half wave rectifier B. Full wave rectifier C. Bridge wave rectifier D. All of these
Last Answer : NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.
Last Answer : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.
Description : The number of electrons in one coulomb charge is equal to: (a) 6.2 × 1018 electrons (b) Zero electrons (c) 1.6 × 10−22 electrons (d) 6.2 × 1021 electrons
Last Answer : (a) 6.2 × 1018 electrons
Description : A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5 A without any ripple. The armature resistance is 2 Ohm. The ... of the motor will be (A) 339 rpm (B) 359 rpm (C) 366 rpm (D) 386 rpm
Last Answer : 359
Description : Is a full-wave rectifier output easier to filter than that of a half-wave rectifier?
Last Answer : Yes.
Description : In the plane of the A.C generator coil is perpendicular to the field, then induced emf in the coil is: a. Maximum b. minimum c. zero d. intermediate value
Description : Paramagnetic materials have relative permeability (a) slightly less than unity (b) equal to unity (c) slightly more than unity (d) equal to that ferromagnetic mate rials
Last Answer : (c) slightly more than unity
Description : Electron can exist in the atom but outside the nucleus because a) speed of electron is equal to the speed of light b) speed of electron is more than speed of light c) speed of electron is less than speed of light d) None of these
Last Answer : c) speed of electron is less than speed of light
Description : What effect does an open diode have on the output voltage of a half wave rectifier and on a full wave rectifier?
Last Answer : An open diode will result in no output from a half waverectifier, and an open diode will cut the output of a full waverectifier in half.
Description : The correct term for the illustrated circuit is a ________. EL-0063 A. single phase half wave high power rectifier B. three phase half wave rectifier C. three phase full wave rectifier D. a single phase full wave rectifier
Description : In the illustrated circuit, section II is considered to be a _______. EL-0085 A. full wave rectifier B. half wave rectifier C. quarter wave rectifier D. short wave rectifier
Description : Which of the following expresses the relationship of the input and output frequencies in a full wave rectifier? A. The output frequency is the same as input frequency. B. The output frequency is ... frequency is twice the input frequency. D. The output frequency is four times the input frequency.
Description : Difference between half wave and full wave rectifier?
Last Answer : A10: The efficiency of half wave rectifier is not so good as that of full wave rectifier Because only one half of the input waveform reaches the output, it is very inefficient if used for ... reduced in the full-wave rectifier and being reduced further with the increase in the number of phases.
Description : Half wave rectifier?
Last Answer : In a half wave rectifier only one half cycle of ac voltage is taken.Here only one diode is used. During the positive half cycle of ac voltage the diode conducts. So current flows through load. During ... with a single diode in a one-phase supply, or with three diodes in a three-phase supply.
Description : If a half-wave rectifier is added to a half-wave voltage doubler, the resulting circuit is a voltage ___
Last Answer : Trippler.
Description : If the output of a half-wave rectifier is 50-volts peak, what is the average voltage
Last Answer : 15.9 volts.
Description : What is the output of a half-wave rectifier?
Last Answer : A pulsating dc voltage.
Description : What is the equation for determining average voltage in a half-wave rectifier?
Last Answer : Eavg = 0.318 × Emax
Description : What is the Ripple frequency of a half-wave rectifier if the input frequency is 60 Hz?
Last Answer : 60 hertz.
Description : Explain the working of Half wave rectifier with suitable diagram
Last Answer : The half-wave rectifier circuit using a semiconductor diode (D) with a load resistance RL but no smoothing filter is given in the figure. The diode is connected in series with the secondary of the ... . Since only half-cycles of the input wave are used, it is called a half wave rectifier.