Description : Which of the following does not rely on the magnetic effect of current for its working? (a) Fan (b) Telephone receiver (c) Carbon microphone (d) Dynamo
Last Answer : Ans:(c)
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 : The device used for converting mechanical energy into electrical energy is called a/an (a) cell (b) transformer (c) dynamo (d) electric motor
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 : What is the difference between electric motor and dynamo ?
Last Answer : Electric energy is converted into mechanical energy in an electric motor. But in dynamos mechanical energy is converted 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 : The magnetic meridian at any point, is the direction indicated by a freely suspended (A) Magnetic needle (B) And properly balanced magnetic needle (C) Properly balanced and uninfluenced by local attractive force (D) Magnetic needle over an iron pivot
Last Answer : (C) Properly balanced and uninfluenced by local attractive force
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
Last Answer : Answer: B
Description : When removing ball or roller bearings from the shaft of a motor, you should use a _____________. A. rawhide hammer B. brass mallet C. wheel puller D. soft iron pry bar
Last Answer : Answer: C
Description : Mould board are usually made from a. Soft centre steel b. Hardened carbon steel c. Chilled cast iron d. Mild steel
Last Answer : a. Soft centre steel
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 : 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 : In a radio receiver with simple AGC:
Last Answer : an increase in signal strength produces more AGC
Description : The best way to ensure that what a person has communicated has reached I receiver is: (a) To use simple words (b) To communicate when there is no disturbance (c) To communicate when the receiver is attentive (d) To ask the receiver to tell what they have received
Last Answer : (d) To ask the receiver to tell what they have received
Description : An attacker sits between the sender and receiver and captures the information and retransmits to the receiver after some time without altering the information. This attack is called as .............. (A) Denial of service attack (B) Masquarade attack (C) Simple attack (D) Complex attack
Last Answer : (A) Denial of service attack
Description : Bresenham line drawing algorithm is attractive because it uses (A) Real arithmetic only (B) Integer arithmetic only (C) Floating point arithmetic (D) Real and integer arithmetic
Last Answer : (B) Integer arithmetic only
Description : A sender uses the Stop-and-Wait ARQ protocol for reliable transmission of frames. Frames are of size 1000 bytes and the transmission rate at the sender is 80 Kbps (1Kbps = 1000 bits/second). Size of ... is lost, the sender throughput is __________ bytes/second. a. 2500 b. 2000 c. 1500 d. 500
Last Answer : a. 2500
Description : Who still uses a land line telephone?
Last Answer : Nope. Not for 5 years.
Description : A ………….. is a temporary connection that uses the Public Switched Telephone Network (PSTN) to connect to the Internet. -Technology
Last Answer : dial-up connection
Description : When the computer network uses telephone lines as communication channel -Technology
Last Answer : MODEMperforms the task of Modulation at sender's site and DEModulation at the receiver's end. Basically, our computer generates data in the form of digital signals which needs to be forwarded ... signals should be converted back to the original digital signals, then this is called demodulation.
Description : One advantage of dial-up-internet access is ___ 1) It utilises broadband technology 2) It utilizes existing telephone service 3) It uses a router for security 4) Modem speeds are very fast 5) None of these
Last Answer : Answer :2
Description : Which of the following primarily uses guided media? A) cellular telephone system B) local telephone system C) satellite communications D) radio broadcasting
Last Answer : local telephone system
Description : ………………...is a minimal protocol that allows isolated hosts to link via TCP/IP over the telephone network and ………………..uses a proposed international standard for transmitting HDLC over asynchronous lines. A. LCP, PPP B. PPP, LCP C. SLIP, PPP D. PPP, SLIP
Last Answer : C. SLIP, PPP
Description : A body weighs slightly more at the poles than at the equator because (a) the earth is flat at the poles. (b) the earth has the maximum speed of rotation at the equator (c) the attractive force at the poles increases due to the ice cap (d) none of these is a complete explanation
Last Answer : Ans:(d)
Description : How black hole has a vast attractive force? What is its density in comparison with Earth and Sun? -Space
Last Answer : There are two things that affect the escape velocity - the mass of object and the distance to the center of that object. For example, a rocket must accelerate to 11.2 km/s in order to escape Earth's gravity ... the mass of our sun would need to be squeezed into a volume with a radius of about 3 km.
Description : what attractive force holds molecules of the same substance together?
Last Answer : Cohesion
Description : Is the attractive force of a magnet greatest at its poles?
Last Answer : Yes.
Description : Why do atoms with a weak electronegativity like lithium have a weak attractive force for electrons?
Last Answer : they have few valence electrons and aren't close to having eightvalence electrons
Description : When Atoms with a high electronegativity like oxygen have a strong attractive force for electrons because?
Last Answer : A. they're close to filling their outer shell, fulfilling the octet rule
Description : Atoms with a low electronegativity, like lithium, have a weak attractive force for electrons because?
Last Answer : They have few valence electrons and aren’t close to having eight valence electrons
Description : The nuclear force is - (1) Short range repulsive force (2) Short range attractive force (3) Long range repulsive force (4) Long range attractive force
Last Answer : (2) Short range attractive force Explanation: Nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. They bind protons and neutrons (“nucleons”) into atomic nuclei.
Description : Which two basic forces are able to provide on attractive force between the two neutrons?
Last Answer : Gravitational and Nuclear
Description : When currents are moving in the same direction in two conductors, then the force will be a) Attractive b) Repulsive c) Retracting\ d) Opposing
Last Answer : a) Attractive
Last Answer : Gravitational and Nucl
Description : Two electron beams move parallel to each other. The nature of force between them is a) Attractive b) Repulsive c) Dependent on magnitude of velocity d) None
Last Answer : b) Repulsive
Description : Attack is a sound characteristic that refers to the way a sound begins. Which of the following is NOT an attack of sound? A. Hard B. Soft C. Crisp D. Simple
Last Answer : D. Simple
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
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.
Description : Give reason: Split rings are used instead of slip rings to construct DC dynamo
Last Answer : Split rings make the current to flow in the same direction in the external circuit in both cycles.
Description : What is a DC dynamo?
Last Answer : A dynamo that produces a "direct current" is called DC dynamo.
Description : What is an AC dynamo?
Last Answer : A dynamo that produces an alternating current is called AC dynamo.