Isolation amplifier objective questions on physics
This action cannot be undone. This will permanently delete All Practiced Questions. In a common emitter transistor amplifier, the audio signal vlotage across the collector is 3V. The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance R 1 will be. What is the output Y in the following circuit, when all the three inputs A,B,C are first 0 and then 1?
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- NEET 2021 Syllabus by NTA, Exam Pattern & Latest Updates!
- Amplifier Transformers Market Global Industry Analysis and Forecast 2021 – 2027
- 【売れ筋新商品】 235/65R18 110H ミシュラン パイロットスポーツ4 SUV ウェッズ ウェッズスポーツ SA-54R WBC 7.5J 新品サマータイヤホイール4本セット 大きな取引
- Electronic Devices Pdf
- Transformer Multiple Choice Questions
- Sensors MCQ – Top 10 Multiple Choice Questions on Sensors
- Electrical Measurements Lab Viva Questions and Answers
- Need for earthing and double insulation
- Objective-collapse theory
- Multiple Choice Questions and Answers on Op-Amp ( Operational Amplifier )
NEET 2021 Syllabus by NTA, Exam Pattern & Latest Updates!
Explanation: A transformer is an electrical device used to step- up or step-down voltage with constant power. Therefore, a change in voltage level causes a change in current. It means, if the voltage is doubled, the current will be halved. What is the value of secondary voltage if the turn ratio is 10? Explanation: Power transformers are usually used for transmission purposes as a step-up device. Power transformers are not directly linked to the consumer side; therefore, it causes very less load fluctuation.
So, the power transformer can operate on full load. Explanation: The transformer is a static electromagnetic device that transforms the voltage from one side of its coil to the other side of the coil without a change in frequency. As we know, the working principle of transformer is based on Mutual induction, which happens at a constant frequency.
Explanation: Open circuit test is performed to find the core loss in the transformer. In this test, the transformer's secondary winding is kept open-circuited, and a wattmeter is connected to the primary side.
An ammeter Used to measure the current is connected in series with the transformer's primary winding, and rated voltage is applied at the primary side. If normal voltage is applied at the primary side, flux is induced, and iron loss will occur. Hence the iron loss is maximum at rated voltage, and it is measured by using the wattmeter.
Explanation: A high permeable material made up of thin silicon steel laminations are used for lamination of transformer core and other electrical devices for the given reasons:. Considering the generators and transmission network to be lossless, the system frequency for a load of MW is. Explanation: When a current-carrying conductor is placed in a magnetic field, a magnetic flux is induced and travels through the core of a transformer from primary to the secondary winding.
During this process, some unwanted current is produced in the core of the transformer, usually known as eddy current, which is a primary cause of heat losses in the core. So, the transformer core is laminated to reduce the unwanted current eddy current and heat loss.
If the current in the primary coil is 6 Ampere, then what is the current in the secondary coil of a transformer. The short circuit test in the transformer is always carried on the high voltage side mainly due to the power supply limitations used to perform the transformer's short circuit test. The primary purpose of performing a short circuit test in a transformer is to calculate the transformer's positive sequence impedance Z. A short circuit test is also performed to calculate the copper loss.
Explanation: In the back-to-back test or Sumpner's test on a transformer, two identical transformers are connected in such a way that one transformer is kept onto another transformer. The primary side of the two identical transformers is connected in parallel across the supply voltage. In contrast, the secondary side of the transformer is connected in series in such a way that emf's are in series opposition.
It is a method for determining the efficiency, voltage regulation and heading under loaded conditions of the transformer. Explanation: The rating of mostly electrical equipment shows its capability to sustain the mechanical load without overheating. There are two types of losses in the transformer due to the heating effect known as iron loss, and another is known as copper loss. If the primary voltage is V, find the secondary voltage. Explanation: As we know, electric power is the same in both the coils of the transformer, so that the given relationship must be true.
Explanation: Transformers have broad applications for various industries; mainly, distribution transformers are filled with oil. The two-primary function of the transformer oil is given below. Insulator: The transformer oil has high dielectric strength; it means it can withstand very high voltage; this is the only reason it acts as an insulator in the transformer. Coolant : As we know, the transformer's coils are made up of copper and carrying a very high current, so it becomes hot in a very short time.
The transformer oil is a good conductor of electricity and heat, so it reduces the coil's temperature. Explanation: The primary function of the Buchholz relay is the detection of arcing in oil-cooled power transformers. The arcing emits gases that travel on the top of the tank head and increase the pressure over there that starts the relay.
Explanation: The noise of the transformer, also called humming, is mainly due to two reasons. Magnetostriction: Magnetostriction refers to the expansion and contraction of the laminations iron core due to the magnetic effect of the current flowing the coil of the transformer.
Magnetostriction may be controlled, but it can't be totally removed depending on the transformer's design. Stray magnetic fields: Generally, the steel used in the transformer core and wire used in the transformer coil vibrating at 50 Hz to 60 Hz frequency because of the interaction of the magnetic fields.
Explanation: As we know, a transformer works on the principle of mutual induction, where you need a dynamic magnetic field to generate an induced emf in the secondary winding. In direct current supply, the change in frequency with respect to time is null, which means the dc supply can't produce a dynamic magnetic field; hence mutual induction can't possible on direct current supply since the primary winding of the transformer has a very low value of resistance so it can't oppose the excessive flow of current; therefore, the current having high value can damage the windings.
Explanation: Cruciform shape is used in transformer core to reduce core loss, copper, in the winding, reduce core reluctance, and reduction of iron and copper losses. In a transformer, eddy current losses in the iron core are directly proportional to the core's thickness. To reduce eddy current loss, we usually use thin sheets of the iron core to reduce skin effect.
Explanation: The transformer is a static no moving parts device, so the rate of magnetic flux change is constant for a certain operation. The moving flux in the transformer core is cut by the coils whose frequency is controlled by the primary supply.
Since the coils or stationary conductors are static, the frequency does not change. Explanation: The dielectric strength refers to the withstand value; it means the electrical stress which oil can withstand safely. Usually, we monitored in transformed oil is BDV breakdown voltage , i.
Explanation: In the transformer, the conservatory provides free space for the expansion of the oil. When the transformer is on full load, the oil heats up and expands.
When the load is reduced from the transformer, oil temperature shrinks and oil contracts. Here, the air space in the conservatory enables breathing when oil expands or contracts. It is possible to manufacture a transformer without a conservator, but in that particular case, a tank with a gas cushion is required at the top of the transformer.
Explanation: The Efficiency of the transformer refers to the ratio of useful power output to the input power, the two being measured in the same unit. Explanation: In the transformer, the high voltage winding always has a greater number of turns, as a voltage is directly proportional to the number of turns.
Good voltage regulation is possible with high voltage winding as it carries a large number of turns. The low voltage winding of the transformer carries more current. So, if tapings are provided on the low voltage side, there are difficulties experienced in the interruption of high currents, making it unworkable.
Hence, it is convenient to provide tapings on high voltage HV winding. Explanation: The highest voltage for transmitting electrical power in India is kV. Explanation: As the name suggests, "Breather" helps out the transformer to breathe, i. Generally, the breather comprises silica gel, which absorbs the moisture form air. Explanation: Parallel operation of single-phase transformer is done to increase the load capacity and reliability of the supply. It is done by adding another transformer in parallel simultaneously, given the continuous supply and frequent maintenance can be done evenly.
The ratio of primary and secondary voltage ratings must be identical. It means the same transformation ratio for the transformer. Explanation: The short circuit test is performed to find the copper loss in the transformer. It is done by shorting the low voltage terminal and applying a low voltage across the high voltage terminal because the current in the high voltage terminal will be less and simple to handle and connect a wattmeter to measure the power dissipated in the low voltage terminal.
The wattmeter reflects the full load copper loss. Explanation: Usually, transformer oil has excellent insulating properties so that it is capable of withstanding high temperature. The Flashpoint of a transformer refers to the lowest temperature at which transformer oil gives vapor. Its primary function is to determine the self-ignition temperature of oil for safety reasons. The flashpoint of the transformer is directly proportional to the safe operation of the transformer.
It means the higher the flash point value safer the operation. If the flash point value is lower than the specified value, the risk of fire in the transformer increases. Explanation: An open circuit test is also known as a no-load test. It is used to find the iron loss at the rated applied voltage to the primary side.
Iron loss of the transformer is not varying with a change in load. The iron loss also helps to determine the voltage regulation and efficiency of the transformer. Open circuit test of a transformer is carried out on the low voltage side by keeping the high voltage side open. Explanation: As we know, the transformer is a static device based on the principle of mutual induction with no rotating part, so there is no frictional loss.
Explanation: Sandwich type winding used in three-phase shell-type transformers. It has a distinct circulation of leakage fluxes at two limbs. The total amount of leakage flux flowing through the two limbs depends on the leakage reactance. The sandwich-type winding is carried out, which depends on the flux distribution and applied voltage over two limbs. Explanation: High voltage winding of a transformer has the less cross-sectional area. The net current flowing through the winding calculates the cross-sectional area.
It means if the current high current flows through the winding, a high cross-sectional area will be obtained since the high voltage winding of a transformer has a low current, so it has a less cross-sectional area. Explanation: The secondary winding of the current transformer is always kept closed because if it open-circuited, the current transformer would develop an extremely high voltage across the secondary terminals.
It may lead to damage to the transformer insulation as well as arcing across the terminal. Explanation: As we know, the transformer has primarily two types of losses Iron loss and copper loss. Iron loss is always constant, whereas copper losses are varying with a load. Both hysteresis loss and eddy current loss do not depend upon load current, which means iron losses are constant with varying load. The transformer is a static electromechanical device that works on the principle of mutual induction.
Transformer transforms:.
Amplifier Transformers Market Global Industry Analysis and Forecast 2021 – 2027
The fundamental idea is that the unitary evolution of the wave function describing the state of a quantum system is approximate. The resulting dynamics is such that for microscopic isolated systems the new terms have a negligible effect; therefore, the usual quantum properties are recovered, apart from very tiny deviations. Such deviations can potentially be detected in dedicated experiments, and efforts are increasing worldwide towards testing them. An inbuilt amplification mechanism makes sure that for macroscopic systems consisting of many particles, the collapse becomes stronger than the quantum dynamics. Then their wave function is always well-localized in space, so well-localized that it behaves, for all practical purposes, like a point moving in space according to Newton's laws. In this sense, collapse models provide a unified description of microscopic and macroscopic systems, avoiding the conceptual problems associated to measurements in quantum theory. Collapse theories stand in opposition to many-worlds interpretation theories , in that they hold that a process of wave function collapse curtails the branching of the wave function and removes unobserved behaviour.
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Ats Mcqs. Uploaded by. ATS Destinaire is a destination for investment and self-use. Explanation: The impulse response of a LTI system is the transfer function itself and hence for the unit step function. The ATS Clinical Cases are a series of cases devoted to interactive clinical case presentations on all aspects of pulmonary, critical care and sleep medicine. The bandwidth of a control system can be increased by using Phase-lead network Phase-lag network Both phase-lead network and phase-lag network Cascaded amplifier in the system 3. Emergency contraceptives are effective if used within. Solved computer practical questions and answers MCQs. Which are important with the exam point of view and for the job tests.
Electronic Devices Pdf
Mini Physics. Earthing is the act of connecting the metal casing of the appliance to earth via a wired connection to the bare ground. Earthing wires are usually have a green and yellow bands around them. Why do you need earthing? Consider this scenario:.
Transformer Multiple Choice Questions
A transducer that converts measurand into the form of pulse is called a Active transducer b Analog transducer c Digital transducer d Pulse transducer Ans : d. Which of the following is a digital transducer? An inverse transducer is a device which converts a An electrical quantity into a non electrical quantity b Electrical quantity into mechanical quantity c Electrical energy into thermal energy d Electrical energy into light energy Ans : a. A strain gauge is a passive transducer and is employed for converting a Mechanical displacement into a change of resistance b Pressure into a change of resistance c Force into a displacement d Pressure into displacement Ans : a. Resolution of a transducer depends on a Material of wire b Length of wire c Diameter of wire d Excitation voltage Ans : c.
Sensors MCQ – Top 10 Multiple Choice Questions on Sensors
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Electrical Measurements Lab Viva Questions and Answers
Dc circuits pdf dc circuits pdf The source should be able to stay constant with a varying load. If R is constant is related to the Zenergy provided by the battery or voltage source. Figures A1 and A2 show two time varying quantities that have non zero average value.
Need for earthing and double insulation
By Science News Staff. January 29, at pm. Updated March 4, at am. In this rapidly evolving epidemic, many unknowns remain. We will update these answers as more information becomes available.
Objective-collapse theory
Learn more. The Patch-clamp technique is a versatile electrophysiological tool for understanding ion channel behavior. Every cell expresses ion channels, but the most common cells to study with patch-clamp techniques include neurons, muscle fibers, cardiomyocytes, and oocytes overexpressing single ion channels. To evaluate single ion channel conductance, a microelectrode forms a high resistance seal with the cellular membrane, and a patch of cell membrane containing the ion channel of interest is removed. Alternatively, while the microelectrode is sealed to the cell membrane, this small patch can be ruptured giving the electrode electrical access to the whole cell. Voltage is then applied, forming a voltage clamp, and membrane current is measured. Current clamp can also be used to measure changes in membrane voltage called membrane potential.
Multiple Choice Questions and Answers on Op-Amp ( Operational Amplifier )
A sensor is a device that takes input from the physical environment. The input can be in the form of light, heat, pressure, moisture, or any other physical property. Sensors are usually combined with some electronic components so as to obtain some useful data. Find brief answer with explanation.
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