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Write short notes on: 

1) Phosphor characteristics 

2) Liquid crystal display

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Description : Liquid Crystal Display (LCD)

Answer : Liquid Crystal Display (LCD) LCD stands for Liquid Crystal Display. It is a flat panel electronic display device which uses light modulating properties of liquid crystal. ... pixel and passive pixel display do not consist of switch at each pixel.

Description : Write short notes on diode.

Answer : Diode is made from semiconductor material like silicon or germanium. Diode may use as rectifier which convert AC to DC. It is a electronic component. It is two terminal device, one is anode and second is ... in one direction. Diode is made from P-type and N-type material. Diode have a PN junction.

Description : Write short notes on Arduino.

Answer : Arduino: Arduino is a open source hardware and software. Arduino is a microcontroller. Since Arduino is open source it have many manufacturer. Arduino project was started in about year ... many sensors to the Arduino. Arduino board have microprocessor, crystal oscillator, 5V voltage regulator.

Description : write short notes on single phase system.

Answer : A "phase" in an electrical system is often referred to as the waveform (may be voltage or the current) of the power supply. The waveform in an AC system is typically ... domestic household or commercial supplies and street lighting. Industrial supplies requires three phase electrical supply .

Description : write short notes on BH curve.

Answer : The B-H curve is the relation between Flux density B in Wb/m2 (on Y Axis) and H in AT/m (on X axis) It is also known as magnetization characteristics. This curve particularly useful ... occurs. At point A' material gets magnetically saturated and the curve becomes flat (parallel to X axis) 

Description : write short notes on Low-pass filter.

Answer : low-pass filter (1) filter exhibiting frequency selective characteristic that allows low-frequency components of an input signal to pass from filter input to output unattenuated all high-frequency components are ... the bandwidth of the filter. A filter whose impulse response is a low-pass signal.

Description : write short notes on Linear motor.

Answer : Normal electrical motor produces rotatory motion same the linear motor produces linear motion. Linear motors have low efficiency. Linear motor can directly produce straight line motion linear motor do not required gears or crank shaft to produce linear motion.

Description : crystal oscillator and its applications.

Answer : Need: Any circuit that generates an alternating voltage is called an oscillator. To generate ac Voltage, it takes energy from the dc source. 1. In some applications voltages of low frequency are required where ... generate clock in digital systems.  It is used as sweep circuits in TV and CRO.

Description : Draw the circuit diagram of crystal oscillator and explain its working.

Answer : To excite a crystal for operation in the series-resonant mode it may be connected as a series element in a feedback path, the crystal impedance is the smallest and the amount of positive feedback is the largest. ... which is good.  The resonant frequency is given as  Fo = 1/( 2 π √LC ) 

Description : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal

Answer : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero 

Description : What is a crystal oscillator?

Description : How to restore a bathroom with liquid acrylic?

Answer : During operation, a bathtub, like any other piece of furniture, gradually wears out. Mostly, the enamel coating deteriorates: the gloss and shine of whiteness disappear, traces of rust, smudges, ... be suitable (excess acrylic will drain into the prepared container, directly under the drain hole).

Description : What is liquid wallpaper and how to apply it correctly?

Answer : What is liquid wallpaper and how to apply it correctly? What could be easier than wallpapering the walls? Nothing complicated, but if we are talking about liquid wallpaper - a modern finishing ... house, a modern office - this material will be an excellent solution for decorating any interior.

Description : Following are the different liquid propellants used in rocket engines 

Answer : Following are the different liquid propellants used in rocket engines 1. kerosene, Liquid oxygen and Liquid Hydrogen similar to kerosene 2. Alcohol and its derivatives (Ethyl Alcohol) 3. hydrazine and its derivatives 4. Hydrogen peroxide 5. liquid hydrogen

Description : State gaseous and liquid insulating material.

Answer : i) Gaseous insulating material : 1. Air 2. Nitrogen 3. Hydrogen 4. SF6 ii) liquid insulating material: 1. Transformer oil 2. Capacitor oil 3. Cable oil 4. Pyranol 5. Savotal 6. Savol 7. Vegetable oil 8. Silicon liquids

Description : Give examples of different types of fuels. Also state any two advantages of liquid fuels over solid fuels.

Answer : Examples of different types of fuels:- 1. Indian Coal : It contain 30 to 40 % ash but sulphur content is less than 1%.. 2. Imported coal: It contents low ash about 10% but sulphur ... can be controlled to match the load requirements. 13. Rapid and efficient starting of the boilers from cold.

Description : The material used in liquid fuses is  (1) SF6 (3) carbon tetra chloride (2) distilled water (4) transformer oil

Answer : The material used in liquid fuses is  carbon tetra chloride

Description : Liquid flow rate is measured using (A) a pirani gauge (B) a pyrometer (C) an orifice plate (D) a bourdon tube

Answer : Liquid flow rate is measured using an orifice plate

Description : Diode VI characteristics

Answer : Diode VI characteristics

Description : Draw symbol & V-I characteristics of (i) LASCR (ii) DIAC (iii) TRIAC

Answer : (i) LASCR:  (ii) DIAC:  (iii) TRIAC: 

Description :  basic characteristics of sound signal.

Answer : Level and loudness: The amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound. The loudness of a ... the reproducing system should be capable of handling the maximum and minimum power in the same ratio. 

Description : Compare characteristics of asynchronous and synchronous transmission mode (four points). 

Answer : Synchronous transmission Asynchronous transmission 1. Synchronous transmission are synchronized by an external clock. 1. Asynchronous transmission are synchronized by special signals along the transmission ... for transferring a small amount of data as it is simple and economical.

Description : Explain the characteristics of solar cell.  

Answer : Characteristics of solar cell : Explanation :- Solar cells produce direct current ( DC ) electricity and current times voltage equals power, so we can create solar cell I-V curves representing ... system so that it can operate as close to its optimal peak power point (MPP) as possible.

Description : State characteristics of force.

Answer : i) Magnitude: The quantity of force e.g. 10 N, 100 kN etc.  ii) Direction: It is the line along which the force acts. It is also called as line of action of the force.  iii) Point of ... .  Push: If the arrow head is pointed towards the point of application, the nature of the force is push.

Description : Draw a symbol and neat labeling V-I characteristics of GTO and explain its operation.

Answer : Ans: Symbol and V-I characteristics of GTO: Operation of GTO: i) As the applied anode to cathode voltage is increased above zero, very small current (leakage current) flows through the device. ... low voltage (VBRR). The reverse breakdown voltage is of the order of 20 to 30 volt only. 

Description : Draw a neat labelling V-I characteristics of SCR and explain the region

Answer : (i) Latching current: It is the minimum anode current required to maintain the SCR in the conduction state just after turn-on and the gate signal has been removed.  (ii) Holding current: It is the minimum anode current required to hold the conducting SCR in the ON state. 

Description : List three important characteristics of an electric circuit.

Description : What is the smallest unit of a compound with the same chemical characteristics?

Answer : The molecule is the smallest unit of a compound with the same chemical characteristics.

Description : The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

Answer : The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

Description : The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator

Answer : The terminal characteristics of a dc generator suitable for electric welders is differentially compounded generator

Description : Which of the following does not show non-linear V-I characteristics? (A) Schottky diode (B) Tunnel diode (C) Thermistor, at a fixed temperature (D) p-n Junction diode.

Answer : Which of the following does not show non-linear V-I characteristics? (A) Schottky diode (B) Tunnel diode (C) Thermistor, at a fixed temperature (D) p-n Junction diode.

Answer : The desirable static characteristics of a measuring system are accuracy, sensitivity and reproducibility.

Answer : The speed/load characteristics of a universal motor is same as that of D.C. series motor.

Description : What are the characteristics of a capacitor?

Description : Explain the characteristics of inductor to be considered while designing it. What is the effect of over current and increase in temperature on inductor.

Description : Explain the electrical characteristics of transformer.

Answer : Transformer electrical characteristics: Area of primary and secondary conductors, Apri and Asec: Winding loss Pw: Flux density and core loss: Leakage inductance: ... transformer span. The rise in temperature may breakdown insulation which may cause failure of the transformer.

Description : What are the desirable characteristics of ideal switch?

Answer : Desirable characteristics of the ideal switch: It is desirable to have power switches characteristics closer to ideal switch. The ideal switch should have the following characteristics. Zero resistance when ... . 100% efficiency. Able to control power flow with zero power dissipation.

Answer : Liquid Crystal Display:-An LCD is a low-cost, low power device capable of displaying text and images. LCD's are extremely common in embedded systems since such system often does not have video monitors ... toggles the enables bit and acts as a delay so that the command can be processed and executed.

Description : Write short notes on multiple fruits.  

Answer : Ans: Multiple fruits are developed from inflorescence. These are of two types known as Sorosis and Syconus. 1. Sorosis: It is developed from Spadix, Spike and Catkin inflorescences. In Morus and ... . Each female flower develops into an achene. The fleshy part is peduncle.Ex: Ficus species.

Description : Write short notes on aggregate fruits.  

Answer : Ans: Fruits developed from bi or multicarpellary apocarpous ovaries are called as aggregate fruits. Ovary of each carpel develops into a small fruit called as fruitlet. All the fruitlets are attached to ... and Nelumbo, etaerio of follicles as in Magnolia and etaerio of drupes as in Rubus. 

Description : Write short notes on single fruit like inflorescence. 

Answer : Ans: Hypanthodium is fruit like inflorescence. The peduncle is condensed, fleshy cup like hollow structure with an apical opening. The flowers are small, sessile unisexual and monochlamydeous. Inner surface of ... flowers. Opening of flowers is not in a definite order. Ex: Ficus species

Description : Write short notes on leaves that help in vegetative reproduction

Answer : Ans: Leaves which have epiphyllous buds help in vegetative reproduction. Such leaves are called as reproductive leaves. In Bryophyllum, notches of leaf margins have epiphyllous buds which upon shedding strike ... buds arise at the leaf tip and in Begonia from the wounded regions of leaf.  

Description : Write short notes on storage roots  

Answer : Ans: Modified roots that become swollen due to accumulation of excessive food materials are called as storage roots. They may be developed from tap root or tap root system which appear in conical shape in ... , fruiting and seed setting. Hence they must be harvested at the end of first year.   

Description : Write short notes on fire extinguishing methods adopted in electrical engineering. 

Answer : Stand 6 to 8 feet away from the fire and follow the four-step PASS procedure. If the fire does not begin to go out immediately, leave the area at once. Always be sure ... fire causing the particles to expand chemically inhibiting combustion and expelling the oxygen thereby smothering the flames. 

Description : Write short notes on 3 phase AC system.

Description : write short notes on thyristor CSI .

Answer : Current-source inverter (CSI) is an inverter with a DC current input. Current source inverters are most commonly used in very high power AC motor drives.

Answer : ADC-Amplifier interface: In most data acquisition system analog to digital converter (ADC) is interfaced with the amplifier. There are different interface architectural schemes. Operational ... . The interaction between analog to digital converter and amplifier affects the system performance.

Description : Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.

Answer : Gate Turn Off Thyristor (GTO) Conventional Thyristor can be turned on with gate terminal but can not turn off from gate terminal. But in case of Gate Turn Off Thyristor (GTO), we can turn it on and off ... subdivided as storage period (Ts), fall period (Tp) and tail period (Tt).

Answer : Timers:-A timer is a peripheral device that can measure time intervals. Timers can be used to1. General events at the specific time or to determine the duration of two external events.eg. Keeping a ... the number of times the car wheel rotates in one second, in order to determine cars speed.

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