Q1. If we increase the value of resistance in electrical ckt the value of current
(A) increase
(B) decrases
(C) constant
(D) none of these
Answer: decrases
Explanation:
Q2. Which among the following is not type of the conductor?
(A) Solid
(B) Liquid
(C) Gas
(D) Wood
Answer: Wood
Explanation: In electrical and electronic systems, all conductors comprise solid metals molded into wires or etched onto circuit boards. Some liquids are good electrical conductors. Mercury is an excellent example. A saturated salt-water solution acts as a fair conductor. Gases are normally poor conductors because the atoms are too far apart to allow a free exchange of electrons. However, if a sample of gas contains a significant number of ions, it can act as a fair conductor.
Q3. what is resistance
(A) opposition to current
(B) member of thyristor family
(C) both a&b
(D) none of these
Answer: opposition to current
Explanation:
Q4. what is unit of emf
(A) volt
(B) watt
(C) ampere
(D) kelvin
Answer: volt
Explanation: Electromotive force, also called emf and measured in volt . It is the voltage developed by any source of electrical energy such as a battery or dynamo. It is generally defined as the electrical potential for a source in a circuit. A device that supplies electrical energy is called a seat of electromotive force or emf. Emfs convert chemical, mechanical, and other forms of energy into electrical energy
Q5. kirchoffs law is applicable for
(A) resistors
(B) capactiance
(C) inductors
(D) junctions in network
Answer: junctions in network
Explanation: Kirchhoffs circuit laws are two equalities that deal with the current and potential difference in the lumped element model of electrical circuits. Kirchhoffs current law states that the current entering any junction is equal to the current leaving that junction. This law is also called Kirchhoffs first law, Kirchhoffs point rule, or Kirchhoffs junction rule (or nodal rule).The principle of conservation of electric charge implies that: At any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node or equivalently the algebraic sum of currents in a network of conductors meeting at a point is zero.Kirchhoffs voltage law (KVL) states that, the sum of all the voltages around a loop is equal to zero. This law is also called Kirchhoffs second law, Kirchhoffs loop (or mesh) rule, and Kirchhoffs second rule.The principle of conservation of energy implies that The directed sum of the electrical potential differences (voltage) around any closed network is zero
Q6. HTTP is
(A) program
(B) utility
(C) hardware
(D) application layer protocol
Answer: application layer protocol
Explanation: The Hypertext Transfer Protocol is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web. HTTP functions as a request–response protocol in the client–server computing model. A web browser, for example, may be the client and an application running on a computer hosting a web site may be the server. The client submits an HTTP request message to the server. The server, which provides resources such as HTML files and other content, or performs other functions on behalf of the client, returns a response message to the client. The response contains completion status information about the request and may also contain requested content in its message body.
Q7. electric flux unit is?
(A) tesla
(B) coloumb
(C) joules
(D) volt meter
Answer: volt meter
Explanation: In electromagnetism, electric flux is the measure of flow of the electric field through a given area. Electric flux is proportional to the number of electric field lines going through a normally perpendicular surface. Gauss law states that , total of the electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity.
Q8. which of the following is an output device
(A) scanner
(B) printer
(C) mouse
(D) keyboard
Answer: printer
Explanation: In computing, an input device is a peripheral used to provide data and control signals to an information processing system such as a computer or information appliance. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks. An output device is any piece of computer hardware item used to communicate the results of data processing carried out by an information processing system which converts the electronically generated information into human-readable form
Q9. MCB stands for
(A) mini current breaker
(B) miniature circuit breaker
(C) mili current branch
(D) Micro cicuit bus
Answer: miniature circuit breaker
Explanation: A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overcurrent or overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.
Q10. The number of bits used to store a BCD digit is
(A) 4
(B) 2
(C) 6
(D) 1
Answer: 4
Explanation: binary-coded decimal (BCD) is a class of binary encodings of decimal numbers where each decimal digit is represented by a fixed number of bits, usually four or eight.
Q11. negative feedback in amplifier
(A) reduces the voltage gain
(B) does not effect voltage gain
(C) increase voltage gain
(D) convert the amplifier into an oscillator
Answer: reduces the voltage gain
Explanation: practical benefits of negative feedback:Stabilization of voltage gain,Decreasing output impedance,Increasing input impedance,Decreasing distortion,Increasing bandwidth
Q12. a bistable multivibrator is a
(A) free running oscillator
(B) triggered oscillator
(C) crystal oscillator
(D) saw tooth wave generator
Answer: triggered oscillator
Explanation: bistable multivibrator can be flipped from one state to the other by an external trigger pulse. This circuit is also known as a flip-flop. It can be used to store one bit of information
Q13. Base 10 refers to which number system
(A) hexadecimal
(B) octal
(C) binary
(D) decimal
Answer: decimal
Explanation: The decimal numeral system (also called base 10 or occasionally denary) has ten as its base. It is the numerical base most widely used by modern civilizations.
Q14. The function of AM detector circuit is
(A) to rectify the input signal
(B) to discard the carrier
(C) to provide the audio signal
(D) All of the above
Answer: All of the above
Explanation: One of the advantages of amplitude modulation is that it is cheap and easy to build a demodulator circuit for a radio receiver.A number of methods can be used to demodulate AM, but the simplest is a diode detector.It operates by detecting the envelope of the incoming signal which it does by rectifying the signal.The AM detector or demodulator includes a capacitor at the output. Its purpose is to remove any radio frequency components of the signal at the output.
Q15. Wave guides are generally made of
(A) cast iron or steel
(B) bronze or aluminium
(C) plastic or bakelight
(D) white metal or gun metal
Answer: bronze or aluminium
Explanation: A waveguide is a structure that guides waves, such as electromagnetic waves or sound waves.
Q16. In a transistor leakage current mainly depends on
(A) doping of base
(B) size of emitter
(C) temperature
(D) rating of transistor
Answer: temperature
Explanation: Reverse leakage current in a semiconductor device is the current from that semiconductor device when the device is reverse biased.When a semiconductor device is reverse biased it should not conduct any current at all, however, due to increased barrier potential, the free electrons on p side are dragged towards positive terminal of the battery, while holes on n side are dragged towards negative terminal of the battery. This produces a current of minority charge carriers and hence its magnitude is extremely small. For constant temperature reverse current is almost constant though applied reverse voltage is increased up to certain limit. Hence it is also called as reverse saturation current.
Q17. the audio frequency range lies between
(A) 20 to 20,000 Hz
(B) 20 to 20,000 KHz
(C) 50 to 5000 Hz
(D) 400 to 4000 Hz
Answer: 20 to 20,000 Hz
Explanation: The SI unit of audio frequency is the hertz (Hz). It is the property of sound that most determines pitch. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
Q18. Very small time intervals are accurately measured by the
(A) Pulsars
(B) White dwarfs
(C) Atomic clocks
(D) Quarts clocks
Answer: Atomic clocks
Explanation: an extremely accurate type of clock which is regulated by the vibrations of an atomic or molecular system such as caesium or ammonia.
Q19. A properly biased JFET will act as
(A) current controlled current source
(B) voltage controlled voltage source
(C) voltage controlled current source
(D) current controlled voltage source
Answer: voltage controlled current source
Explanation: In BJTs, the emitter current is proportional of the base current , while in FETs the source/drain current is proportional to the gate voltage.
Q20. a transformer provides a path for magnetic flux of
(A) low conductivity
(B) high reluctance
(C) low reluctance
(D) high conductivity
Answer: low reluctance
Explanation: Reluctance of a magnetic path is inversely proportional to the magnetizing inductance of that path in the electrical circuit. So, if you have high reluctance, your magnetizing inductance Lm will be low. Generally transformers have a large Lm and low reluctance
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