Description : Which of the following uses the attractive force on soft iron? (a) Carbon microphone (b) Telephone receiver (c) Simple motor (d) Dynamo
Last Answer : Ans:(b)
Description : Explain simple telephone communication system with circuit and equation of current flow in microphone?
Last Answer : Simple Telephone Communication: In the simplest form of a telephone circuit, there is one way communication involving two entities, one receiving (listening) and the other transmitting (talking). ... carrier wave in AM system. The quantity m is equivalent to the modulation index in AM.
Description : What kind of receiver is used in conventional telephone handset? A. Capacitor B. Electromagnetic C. Carbon D. Ceramic
Last Answer : B. Electromagnetic
Description : What kind of receiver is used in converntional telephone handset? A. Capacitor B. Carbon C. Electromagnetic D. Ceramic
Last Answer : C. Electromagnetic
Description : For sound recording, what is necessary? a) Speaker b) Microphone c) Talker d) Mouse e) Telephone
Last Answer : b) Microphone
Description : What special electromechanical effect is the basis for carbon microphone operation?
Last Answer : The changing resistance of carbon granules as pressure is applied to them.
Description : Dynamo is a device for converting – (1) Heat energy into electrical energy (2) Mechanical energy into electrical energy (3) Magnetic energy into electrical energy (4) Chemical energy into electrical energy
Last Answer : (2) Mechanical energy into electrical energy Explanation: A dynamo is a device for converting mechanical energy into electrical energy, esp. one that produces direct current. A dynamo is an ... were based, including the electric motor, the alternating-current alternator, and the rotary converter.
Description : The Dynamo converts – (1) Electrical Energy into Mechanical Energy (2) Mechanical Energy into Magnetic Energy (3) None of these (4) Mechanical Energy into Electrical Energy
Last Answer : (4) Mechanical Energy into Electrical Energy Explanation: Dynamo is a device for converting mechanical energy into electrical energy, especially one that produces direct current. It uses electromagnetic ... mechanical rotation into a pulsing direct electric current through the use of a commutator.
Description : The dynamo converts – (1) mechanical energy into electrical energy (2) electrical energy into mechanical energy (3) mechanical energy into magnetic energy (4) magnetic energy into mechanical energy
Last Answer : (1) mechanical energy into electrical energy
Description : A dynamo is used to convert – (1) mechanical energy into electrical energy (2) electrical energy into mechanical energy (3) electrical energy into magnetic energy (4) magnetic energy into mechanical energy
Last Answer : (1) mechanical energy into electrical energy Explanation: A dynamo converts mechanical energy into electrical energy by taking advantage of a phenomenon known as electromagnetic induction. It is an electric generator that is similar to those that provide electricity to our homes.
Description : The dynamo is a device for converting (1) Heat energy into electrical energy (2) Mechanical energy into electrical energy (3) Magnetic energy into electrical energy (4) None of these
Last Answer : (2) Mechanical energy into electrical energy
Description : The Dynamo converts (1) Electrical Energy into Mechanical Energy (2) Mechanical Energy into Magnetic Energy (3) None of these (4) Mechanical Energy into Electrical Energy
Last Answer : Mechanical Energy into Electrical Energy
Description : The dynamo converts (1) mechanical energy into electrical energy (2) electrical energy into mechanical energy (3) mechanical energy into magnetic energy (4) magnetic energy into mechanical energy
Last Answer : mechanical energy into electrical energy
Description : A dynamo is used to convert (1) mechanical energy into electrical energy (2) electrical energy into mechanical energy (3) electrical energy into magnetic energy (4) magnetic energy into mechanical energy
Description : Dynamo is a device for converting (1) Heat energy into electrical energy (2) Mechanical energy into electrical energy (3) Magnetic energy into electrical energy (4) Chemical energy into electrical energy
Last Answer : Mechanical energy into electrical energy
Description : Communication management: 1. Is important only in projects involving telephone, television, radio, or newspaper production facilities and operations 2. Is not a big problem for people with normal ... . Involves the originator, the message, the medium and the receiver 4. Preparing an agenda
Last Answer : 3. Involves the originator, the message, the medium and the receiver
Description : . ________ is the recording system which enables sender to leave messages for receiver by telephone. (a) E-Mail ; (b) Voice Mail ; (c) Videoconferencing ; (d) Teleconferencing
Last Answer : (b) Voice Mail ;
Description : What is the difference between a dynamic microphone and a magnetic microphone?
Last Answer : A dynamic microphone has a moving coil and the magnetic microphone has a moving armature.
Description : Social class who rely on relatives for assistance in trouble times and economic support considered asA. upper middles B. working class C. middle class D. upper uppers
Last Answer : working class
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 : The battery has following three major functions to perform: a) To provide a source of current for engine starting, lighting and use of horn. b) To help control the voltage in the electrical system. c ... the current produced by dynamo/alternator and to furnish the current d) all of the above. Ans. d
Last Answer : ans d
Description : Alternators are preferred over dynamo because A. Alternators can produce a strong current of 30-40 amperes. B. Alternators don’t required cutout reiny C. Alternators don’t have commutaters D. All of the above
Last Answer : D. All of the above
Description : main function of the current regulator is A. To prevent the reversal flow of current from the battery when dynamo speed is drops. B. To safeguard against flow of high currents to battery when armature develops ... . C. To prevent building up of high voltage in a circuit. D. None of the above
Last Answer : B. To safeguard against flow of high currents to battery when armature develops more current.
Description : Main function of cutout relay in electrical circuit is A. To prevent the reversal of current flow from the battery when dynamo speed (engine speed) reduces. B. To restrict the maximum output at ... deliver current to the battery or to the lightening and ignition circuit. D. None of the above
Last Answer : A. To prevent the reversal of current flow from the battery when dynamo speed (engine speed) reduces.
Description : Alternating current is converted into direct current by a (1) transformer (2) dynamo (3) oscillator (4) rectifier
Last Answer : rectifier
Description : What is a major disadvantage of a carbon microphone?
Last Answer : Background hiss resulting from random changes in the resistance between individual carbon granules.
Description : JWin JBM60 Headset microphone not working!
Last Answer : answer:mac or pc what operating system are you using
Description : Why isn't my microphone working on my Mac?
Last Answer : Are you sure the problem is on you end? Does your Mom have the mute on or speakers turned off!
Description : Which of these instruments were not working in Dakota? a) Compass and Radio b) Speedometer and Barometer c) Microphone and Gear d) Lights and Engine
Last Answer : a) Compass and Radio
Description : Describe with the help of diagram the working of crystal type microphone.
Last Answer : Working:-The crystal microphone works on the principle of piezo electric effect. When pressure is applied to any of these crystals electricity is generated, and if an electric charge ... to the crystal unit will generate an electric potential which is proportional to applied pressure.
Description : Two mutually exclusive projects are being considered. Neither project will be repeated again in the future after their current lives are complete. There exists a potential problem though -- ... NPV technique and simply choose the highest IRR since managers are concerned about maximizing returns.
Last Answer : A. Rely on the NPV method and make your choice as it will tell you which one is best.
Description : Microphone is a device which transforms the – (1) sound signal into current signal (2) current signal into sound signal (3) sound signal into light signal (4) light signal into sound signal
Last Answer : (1) sound signal into current signal Explanation: Microphone is a device which transforms the sound signal Into current signal.
Description : A device that converts high frequency current into electromagnetic wave. A. Antenna B. Loudspeaker C. Microphone D. Transducer
Last Answer : A. Antenna
Description : Microphone is a device which transforms the (1) sound signal into current signal (2) current signal into sound signal (3) sound signal into light signal (4) light signal into sound signal
Last Answer : sound signal into current signal
Description : Which of the following microphone does not require polarizing current? (1) Crystal microphone (2) Condenser microphone (3) Carbon microphone (4) All of the above
Last Answer : Crystal microphone.
Description : Draw the TRF receiver block diagram and explain its working.
Last Answer : Explanation:- 1. TRF receivers are simple and having high sensitivity. The AM transmission takes place in MW band and SW band. MW frequency range is 540KHz to 1640KHz. 2. ... power level to drive the loudspeaker. 7. The loudspeaker converts electrical signal into original sound information.
Description : Draw the block diagram of PCM receiver with the help of relevant wave form and explain its working
Last Answer : Block diagram of PCM receiver:- Explanation:- A PCM signal contaminated with noise is available at the receive input. The regeneration circuit at the receiver will separate PCM pulses from noise ... quantized PAM signal is passed through a low pass filter recovers the analog signal x (t).
Description : Explain the working of Direct to Home Receiver (DTH) with its indoor and outdoor unit.
Last Answer : Block diagram: Outdoor unit: It consists of a receiving antenna, low noise amplifier & converter the receiving antenna is parabolic reflector with a horn as the active element. The ... are fed to the normal domestic TV receiver, which after due processing reproduces picture & sound.
Description : Indicate the false statement. Noise figure is defined as A. the ratio of the S/N power supplied at the input terminal of a receiver or amplifier to the S/N power supplied to the output or ... under test, both working at the same temperature over the same bandwidth and fed from the same source
Last Answer : C. an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals
Description : Explain the working of amplitude limiter in FM receiver with circuit diagram.
Last Answer : Amplitude limiter: The function of amplitude limiter is to remove all amplitude variation of FM carrier voltage that may occur due to atmospheric disturbances. Use of amplitude limiter makes the system less noisy Circuit Diagram:
Description : What is the source of electric energy in an artificial satellite? (a) A mini nuclear reactor (b) A dynamo (c) A thermopile (d) Solar cells
Last Answer : Ans:(d)
Description : The device used for converting mechanical energy into electrical energy is called a/an (a) cell (b) transformer (c) dynamo (d) electric motor
Last Answer : Ans:(c)
Description : Which of the following devices converts electrical energy into mechanical energy? (a) Dynamo (b) Transformer (c) Electric motor (d) Inductor
Description : State the functions of the following components in a dynamo /motor.
Last Answer : a) Commutator: It is used to alter the direction of the current in me coil after every half rotation. b) Carbon brushes: it is used to supply a continuous current to the rotating coil through the commutator.
Description : A cyclist riding a cycle fitted with a dynamo to a tyre gets bright light in the bulb connected, when he pedals fast. Why?
Last Answer : More magnetic lines of force change with respect to the coil, leading to more current being produced.
Description : What energy conversion does take place in a dynamo when it is in use?
Last Answer : Mechanical energy changes into electrical energy.
Description : In an AC dynamo, the speed at which the coil rotates is doubled. How would this affect a) the frequency of output voltage b) the maximum output voltage?
Last Answer : a) Frequency is doubled b) Maximum output voltage is doubled.
Description : Suggest two ways in an AC dynamo to produce a higher emf.
Last Answer : a) By increasing the speed of rotation of coil b) By increasing the number of turns of the coil.