YOU WERE LOOKING FOR: Electronics Exam Questions And Answers Pdf
A dumb terminal has A an embedded microprocessor B extensive memory C independent processing capability D a keyboard and screen One millisecond is A 1 second B 10th of a seconds C th of a seconds D th of a seconds The output quality of a printer...
Which of the following storage devices can store maximum amount of data? Which computer was considered the first electronic computer until when court invalidated the patent? A physical connection between the microprocessor memory and other parts of...
A B C D Which of the following produces the best quality graphics reproduction? Which of the following is not processing? Software in computer A Enhances the capabilities of the hardware machine B Increase the speed of central processing unit C Both of above D None of above What was that name? A Tabulator Machine Co. B Computing Tabulating Recording Co. C The Tabulator Ltd. D International Computer Ltd. What information does this address specify? What is the responsibility of the logical unit in the CPU of a computer? Abacus was the first A electronic computer B mechanical computer C electronic calculator D mechanical calculator Which is used for manufacturing chips? The value of each bead in heaven is A 1 B 3 C 5 D 7 Mnemonic a memory trick is used in which of the following language? Which was the most popular first generation computer? Which is considered a direct entry input device?
From which generation operating systems were developed? How many address lines are needed to address each machine location in a x 4 memory chip? Why are vacuum tubes also called valves? An integrated circuit is A A complicated circuit B An integrating device C Much costlier than a single transistor D Fabricated on a tiny silicon chip What type of control pins are needed in a microprocessor to regulate traffic on the bus, in order to prevent two devices from trying to use it at the same time? Which of the following is used as a primary storage device? What are the three decisions making operations performed by the ALU of a computer?
Nepal brought a computer for census of BS. This computer was of A first generation B second generation C third generation D fourth generation Algorithm and Flow chart help us to A Know the memory capacity B Identify the base of a number system C Direct the output to a printer D Specify the problem completely and clearly Which statement is valid about computer program?
When was Pascaline invented? Which of the following statement is valid? What is required when more than one person uses a central computer at the same time? Which of the following is the first computer to use Stored Program Concept? The which computer? Once you load the suitable program and provide required data, computer does not need human intervention. What is a brand? A The name of companies that made computers B The name of product a company gives to identify its product in market C A name of class to indicate all similar products from different companies D All of above Dots per sq inch B.
Collector CurveIC 5 10 15 20 25 30 35 40 45VCE1 Set out the load-line equation for the circuit and plot this on the samegraph as the collector curve. Hence or otherwise determine the loadcurrent flowing when the BJT is switched on. The load current is got by finding the intersection of the load line withthe characteristic curve — i. Typically we might expect about 0. Excessive power dissipation in a BJT will lead to the device heating upto a point where the temperature of the device exceeds the maximumrated operating temperature. In this case the device may fail or at leastthe operating lifetime of the device may be shortened. To reduce the heating, the device may be fitted with a heatsink toconduct heat away from the device and radiate this heat to thesurrounding air. Identify the type of rectifier circuit represented in figure 1 and explain theoperation of the circuit with reference to the function of each component withinthe circuit. This is a half-wave rectifier circuit with capacitor smoothing.
The mains voltage is applied to the primary winding of the transformer T1. This typically produces a reduced amplitude voltage on the secondary winding— closer to the desired d. Thetransformer also provides electrical isolation between the mains supply and theload. The diode D 1 performs rectification. On positive half cycles of the secondary voltage, D 1 is forward biased andconducts — connecting positive half cycles across R Load , with the top of R Loadpositive. On negative half cycles of the secondary voltage, D 1 is reverse biased anddoes not conduct. No current flows in the load resulting in zero voltage acrossR Load. In between positive peaks in the transformer secondary voltage, thetransformer voltage drops below the voltage stored on capacitor C.
Thisreverse biases D 1. Current is supplied to the load by C discharging throughR Load. The charge lost by C is replaced when the secondary voltage rises backto the next positive peak. Thus C maintains a relatively constant voltage acrossthe load. R Load represents the circuit to which it is desired to supply d. Calculate the peak secondary voltage from the transformer. The power supply unit shown in figure 1 is said to be unregulated -Explain the meaning of the term unregulated as used in relation to powersupplies. An unregulated power supply is one where the output voltage maychange substantially from the stated nominal output voltage underspecific operating conditions.
It is used as shown in the circuit belowShow how a three terminal regulator chip may be used to provide a regulatedoutput voltage. In relation to power supply units, explain the meaning of the terms percentageload regulation and percentage line regulation. Percentage load regulation is a figure of merit used to describe the amount offluctuation in the value of the output voltage from a power supply unit PSU that results when the output current from the PSU is changed between zero andmaximum.
Percentage line regulation is a figure of merit used to describe the amount offluctuation in the value of the output voltage from a power supply unit PSU that results when the mains supply voltage changes between specifiedminimum and maximum values. The lamp is rated at 0. The PLC output is 5 V. Identify on the characteristicthe active region, the saturation region and the breakdown region. Hencedetermine if the PLC output will be powerful enough to turn the lamp on fullyusing this interface circuit. Excessive power dissipation in a BJT will lead to the device heating up to apoint where the temperature of the device exceeds the maximum ratedoperating temperature. In this case the device may fail or at least the operatinglifetime of the device may be shortened. To reduce the heating, the device may be fitted with a heatsink to conduct heataway from the device and radiate this heat to the surrounding air. The motor presents a load resistance of when running. With reference to typical values where necessary, estimate the powerdissipation in the BJT when switched on.
Maximum power dissipation occurs in the BJT as it switches fromfully on to fully off. To reduce the heating, the device may be fitted with a heatsink toconduct and radiate heat away from the device. Explain the reason for including the diode D1 in the circuit. The motor is an inductive load that the transistor is required to switchon and off. Switching the current in an inductor will cause it togenerate a large voltage in an attempt to prevent the current changing. This inductive voltage could potentially be large enough to damage theBJT. D1 is connected so as to present a low impedance to the inducedvoltage and hence protecting the BJT. The diode is reverse biasedunder static operating conditions and does not affect normal operationof the circuit. D1 is often called a flywheel diode. A Darlington circuit is sometimes used in place of the BJT in switchingapplications. Sketch a Darlington switching circuit and explain theadvantages associated with the circuit compared to a single BJT.
The first one provides basecurrent to the second one from its emitter. The result is a10 device with a much higher current gain than is possible with a singleBJT. This allows even smaller control currents to control larger loadcurrents. Figure 3Write out the equation for Ohms law showing the relationship between voltage, current andresistance in an electrical circuit. Increasing R to will cause a reduction in current flowing in the resistor and a consequentreduction in power dissipationThe resistor is replaced by one with a value of Calculate the new value of current flow and therequired power rating for the resistor. A device with a rated power of 5W willheat up excessively and experience a shortened lifetime relative to a higher wattage device. State what a heatsink is and explain why R2 may need one if a 10 10 watt component were used inthe construction of this circuit. A heatsink is a mechanism designed to conduct heat away from a heat sensitive device so that thedevice does not operate at an excessive temperature that would contribute to premature failure of thedevice.
It is usually made of metal for its high thermal conductivity. The surface area will bemaximised using fins to permit heat to escape to the surrounding air. Explain what the term de-rating means and describe how it may be used in order to improve thelong-term reliability of an electronic component. De-rating is a technique used to prolong the service lifetime of a device. A device operated near to itsmaximum specified operating limits will wear out faster than a device operated well below its12 maximum limits. Derating calls for the use of devices with higher rated limits than are strictly neededin an application so that they will provide longer service. Identify the type of rectifier circuit represented in figure 2 and explain the operation of the circuitwith reference to the function of each component within the circuit.
This is a bridge rectifier circuit. Transformer T provides a reduction in the amplitude of the mains voltage to a value near to that of therequired dc output voltage. It also provides electrical isolation between the mains and the load R. It accumulates electriccharge as the a. After the peak, the capacitor deliversthe stored charge to the load resistor, preventing the load voltage from dropping in between peaks inthe a. R represents the resistance of the load being powered from the supply. Sketch to scale the voltage across R as a function of time showing its relationship to the secondaryvoltage from the transformer.
Assume a value of for R and a mains frequency of 50 Hz. An unregulated power supply is one where the output voltage is not protected from fluctuation in theevent that —The mains input voltage changes within permitted limits The current drawn by the load changes. Either of these occurrences will result in a change in output voltage amplitude from an unregulatedpower supply. Give one example where an unregulated power supply may be acceptable and one example where aregulated power supply is required. An unregulated power supply example is a battery charger — many chargers provide unregulated outputvoltages. A regulated power supply is necessary for powering up digital and microprocessor circuits. Show how a three terminal regulator chip may be used to provide a regulated output voltage andexplain how a regulated output voltage of 9 V may be obtained.
Percentage line regulation is a figure of merit that describes the extent of change in the output voltagefrom a power supply unit as a consequence of a change in the mains amplitude. R1 is a resistorR2 is a potentiometerC1 is a capacitorL1 is a lampT1 is a SCRThe function of the circuit is a Lamp Dimmer controlBriefly describe the principle of operation of the device T1 including an explanation of how thedevice is made to turn on and off. T1 will not conduct when reverse biased — i. When T1 is forward biased it will not commence conduction until a sufficient voltage is applied on thegate terminal.
Once triggered into conduction, the SCR will continue to conduct until it becomesreverse biased at which point it will turn off. The rms voltage is related to the area underneath the LAMP waveform above. Keeping the SCR turnedoff until a point somewhere after zero crossing of the AC waveform has the effect of reducing this areabelow the area given by a complete sine half cycle. Thus in the diagram above, each positive half cycleis only half used giving half the rms voltage. State the likely effect of removing component C1 from the circuit and explain the reason why thebehaviour of the circuit is modified.
This allows triggering to occur almost anywhere between 0 and degrees.. Removing C1 will remove this delay and triggering will only be possible between 0 and 90 degrees. The motor draws 1 Amp from a 24 volt supply when running. Calculate the base current in the BJT whenS 1 is closed. Set out the load-line equation for the circuit and plot this on the same graph as the collector curve. Hence or otherwise determine the load current flowing when the BJT is switched on. The load line intersects the characteristic curve at collector current of 1 Amp approxWith reference to typical values where necessary, estimate the power dissipation in the BJT whenswitched on. Typically, the voltage between the collector and emitter when saturated is about 0.
The self inductance of the motor windings will resist this change in current bycreating a large reverse e. The diode D1 is included to provide adischarge path for this e. Figure
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Logic Gates Questions And Answers Pdf In digital electro nics using other symbols, the logic gates to represent the bit manipulations. Some time Reasoning questions are very confusing and time consuming and candidates face problem in this section as they find it difficult to finish it on time. The output of the gate is the result of applying this rule to one or more "inputs". But in GATE , marks were given to all for this question. Questions 1—5. Every terminal in a logic gate will always be in one of the two binary states 0 or 1. Read the "Index of lessons" for more information. Artificial Intelligence multiple choice questions and answers are given below. Question Explain different logic gates and mention their truth table of operation.
In simple terms, logic gates are the electronic circuits in a digital system. Research the part numbers and datasheets of the following logic gate integrated. Type 1 — Definite Logic. Explaining your problem-solving process and the logic you used to arrive at your answer can help you stand out as a stronger candidate. So, the truth table for the inputs to the logic circuit is as given below:. Digital electronic circuits operate with voltages of two logic levels namely Logic Low and Logic High. Sequential Logic Circuits Circuits with memory : In this type of logic circuits outputs depend on the current inputs and previous inputs.
These describe the only two states that exist in digital logic systems and will be used to represent the in and out conditions of logic gates. Word Count: Logic gates are the basic building blocks of any digital system. Although these circuits may be. Answer this question: You explored ripple-carry adders and creating a single logic block for adding two 4 bit numbers. Computer Architecture multiple choice questions mcqs and answers page contain 5 questions from chapter Digital Logic Circuits.
In any electronic circuit we can execute a certain logic with the help of the logic Gates. Logic Gates 4 OO Software Design and Construction 2-input Logic Gate Hierarchy It is sensible to view each of the 2-input logic gates as a specialized sub-type of a generic logic gate a base type which has 2 input wires and transmits its output to a single output wire. International Human Resource Management study material includes international human resource management notes, book, courses, case study, syllabus, question paper, MCQ, questions and answers and available in international human resource management pdf form.
Question 1. Also, cite any source you use please. In this worked example with questions and answers, we start out with a digital logic circuit, and you have to make a Boolean expression, which describes the logic of this circuit. Here we will try to come up with NOR gate using alternative way. CMOS interview questions. And that's all the information they get. You can also contribute practice questions with answers and explanations on GATE. Explain what is a combinational circuit? In a combinational circuit, the output depends upon present input s only i. How the logic circuits can be designed using these gates?. Although there are extra transistors given that it uses clocks. Also includes a nod to binary addition and the half-adder logic circuit. Answer for question no 15 is correct. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. On worksheet No. Logic gates are idealized to implement a boolean function in all circuits of a computer.
These are "1 of 47 Coding - Decoding" questions answers of "Coding - Decoding" Verbal Reasoning with explanation for various competitive examination and entrance test. The unofficial Answer Key for NEET is out, it is important that candidates have their question papers with them to assess their performance properly and check their NEET scores. It is an electronic circuit having one or more than one input and only one output. The inputs to the combinational logic would usually. All logic gates obey their truth table. Each problem gives you premises information and asks which conclusion follows logically. A logic gate is an electronic component that can be used to conduct electricity based on a rule.
These verbal ability and reading comprehension question tests will be very useful for the CAT Verbal preparation. We provide complete international human resource management pdf. Logic Gates Questions and Answers. It is the integration of no. The logical effort of a logic gate will depend slightly on the mobilitiy ratio in the fabrication process used to build it. See Propositional Logic. This quiz tests the very basics of logic gates. Although fractions do not need to be reduced to lowest terms, they may need to be reduced to fit in the grid.
Choose the one alternative that best completes the statement or answers the question. Digital logic design MCQs has multiple choice questions. When drawing a truth table, the binary values 0 and 1 are used. Digital Logic multiple choice questions answer for various academic and competitive exams. The AND Gate. Logic gates are the building blocks from which most. Explanation are given for understanding. Make sure to clearly label all inputs and outputs. Aspirants have to figure out the appropriate answers for that. The logical symbol for two-input AND gate and the truth table is given below.
Questions include constructing truth tables, applications of these logic gates to suit the requirements of automated devices such as automatic gates, alarm systems, automated checking machinery. Logic Scripts has been defined as a set of SQL or MDX programming structure which are meant for performing some customized functions for flexibility and manage data models. Welcome Think Maths. The best introduction to logic is to DO some logic. The one shown in this figure has two entries, however you can have more.
The solved questions answers in this Combinational Logic Circuits - MCQ Test quiz give you a good mix of easy questions and tough questions. Reveal Answers. A programmable logic device PLD is an electronic component used to build reconfigurable digital circuits. It is frankly great to train the minds of the little ones to solve funny riddles. These questions are asked by many aspirants and candidates. Since we are focusing on only one gate and its expression, it is easy. Payment of Rs. Set theory begins with a fundamental binary relation between an object o and a set A.
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