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Why biasing is required for a transistor?

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Description : What is self biasing of transistor?

Description : List various transistor biasing methods.

Answer : Types of biasing methods: i. Base bias (or fixed bias) ii. Base bias with emitter feedback. iii. Base bias with collector feedback iv. Voltage divider bias (or self bias) v. Emitter bias. 

Description : Define biasing of transistor

Answer : Biasing of transistor is the process that makes the base emitter junction of transistor always forward biased and collector junction reverse biased for achieving the faithful amplification .

Description : What do you mean by biasing of a transistor?

Description : What are the types of biasing?

Answer : Biasing is classified into 2 types.The 2 types are 1) Forward biasing 2) Reverse biasing

Answer : The proper flow of zero signal collector current and the maintenance of the proper collector emmiter voltage during passage of single called as transistor biasing

Description : State the need of biasing of BJT.

Answer : Need of biasing: The basic need of transistor biasing is to keep the base-emitter (B-E) junction properly forward biased and the collector-emitter (C-E) junction properly reverse biased ... transistor biasing is necessary for normal and proper operation of transistor to be used for amplification. 

Description : Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJT.

Answer : Two advantages of voltage divider biasing of BJT. 1. It is very simple method of transistor biasing. 2. The biasing conditions can be very easily set. 3. there is no loading of ... 5. The resistor RE introduces a negative feedback. So all the advantages of negative feedback are obtained. 

Description : What type of biasing is used in CE amplifier?

Description : What is emitter biasing?

Description : Why transistor is called as bipolar device.

Answer : BJT is called bipolar device because in BJT current conduction takes place due to majority as well as minority charge carriers that is because of electrons as well as holes.

Description : What is thermal runaway of a transistor?

Description : What is meant by stabilization in transistor?

Description : What is the main use of a transistor?

Answer : Main use of a transistor as amplifier and as switch.

Description : What is role of HFE in transistor ?

Description : Compare P.N.P and N.P.N transistor.

Answer : Parameter PNP transistor NPN transistor Definition Two blocks of p- types semiconductors are separated by one thin block of n-type semiconductor. Transistor in which two ntype layer ... Positive Voltage  Emitter Terminal Collector Terminal Ground Signal High Low

Description : Draw construction of SCR using two transistor model. Explain its operation.

Answer : Two Transistor Model of SCR or Thyristor

Description : Draw the V-I characteristics of power transistor. 

Answer : V-I characteristics of power transistor:

Description : Describe thermal runaway of transistor and explain how it can be avoided.

Answer : Concept of thermal runaway:  1.We know that  IC = β IB + (1+ β) ICO  Where ICO is the leakage current and ICO is strongly dependent on temperature. 2. Leakage current approximately doubles for ...   Thermal runaway can be avoided by : 1) Using stabilization circuitry 2) Heat sink 

Description : Define α and β of the transistor. 

Answer : α: The ratio of collector current IC to emitter current IE for a constant collector to base voltage VCB in the CB configuration is called current gain alpha (α).   β : The ratio of collector ... a constant collector to emitter voltage VCE in the CE configuration is called current gain beta (β) .

Description : Transistor operating configurations

Answer : Transistor operating configurations

Description : Define junction field effect transistor (JFET) and give an example.

Answer : Junction Field-Effect Transistor: It is a semiconductor device having three terminals, namely Gate, Drain and Source, in which the current flow is controlled by an electric field set up by an external voltage applied ... : i) n-channel JFET and ii) p-channel JFET Examples of JFET: BFW 10, BFW 11 

Description : Explain working of n-p-n transistor in unbiased condition.

Answer : Construction of NPN transistor: For an unbiased transistor no external power supplies are connected to it. Base is sandwiched between collector & emitter terminal. It is thin & lightly doped ... providing external power supply to transistor & this process is known as Biasing.

Description : Define α & β and derive the relation between (α) &) (β) of transistor.

Answer : α : The ratio of output collector current IC to input emitter current IE in the CB configuration is called current gain alpha (α).  β : The ratio of output collector current IC to the input base current IB in the CE configuration is ... ( 1/β) + 1  hence 1/ α = (1+β )/ β  Therefore, α = β /(1+β)

Description : With neat diagram explain working of NPN transistor.

Answer : N-p-n transistor is made by sandwiching thin layer of p-type semiconductor between two layers of n-type semiconductor. It has three terminals - Emitter, Base and collector. The npn transistor has two ... up in the collector as it is more positive. In this way, current flows in the transistor.

Description : Draw and explain self-basing of a transistor.

Answer : Transistor Biasing is the process of setting a transistors DC operating voltage or current conditions to the correct level so that any AC input signal can be amplified correctly by the transistor. ExplanationIt ... Applying KVL to o/p loop , Collector-emitter voltage, VCE = VCC − IC RC

Description : Compare between CB , CE & CC transistor configuration.

Answer : Parameter CB CE CC I/P impedance Low Or 50Ω Medium Or 600Ωto 4kΩ High Or 1 MΩ Current Gain Less than or equal to 1 High Highest Voltage Gain Medium Medium Less ... k Ω to 50 k Ω Low Or 50 Ω Phase shift between input and output 0° 360° 0° 

Description : Which of the following statements is wrong for transistor biasing methods:  1. The base resistor method does not provide stabilization of operating point 2. The biasing with feedback ... than collector feedback method 4.Voltage divider bias is widely used because it has stable operating point

Answer : Which of the following statements is wrong for transistor biasing methods:  1. The base resistor method does not provide stabilization of operating point 2. The biasing with feedback ... than collector feedback method 4.Voltage divider bias is widely used because it has stable operating point 

Description : A bipolar junction transistor (BJT) is used as a power control switch by biasing it in the cut-off region (OFF state) or in the saturation region (ON state). In the ON state, for ... base-collector junction is reverse biased (D) both the base-emitter and base-collector junctions are forward biased

Answer : A BJT is as a power control switch by biasing it in cut-off region (OFF state) or in the saturation region (ON state). In  ON state, for BJT both the base-emitter and base- collector junctions are forward biased

Description : In a transistor biasing circuit with voltage divider bias circuit, if the operating point is on the left on the load line. (a) peak of the input voltage is clipped. (b) one side peak of the output ... . (c) both positive and negative peaks are clipped. (d) there will be a distortion in the middle.

Description : What is the need for biasing?

Answer : To get proper collector current Proper base emmiter voltage Proper emmiter collector voltage In short to maintain operating point such as faithful amplification is produced

Description : For a transistor, Ceb=20pF, Ccb=5pF, re=1kOhm. Its figure of merit (in MHz) is about  A) 65 B) 650 C) 130 D) 13 

Description : For an NMOS transistor, Vt= 2 V, Vgs= 3 V, Vdd= 10 V,µnCox=20 µA/V2 , L=10 meter, W= 400 µmeter. The drain current (in mA) is  A) 2 B) 1.2 C) 0.4 D) 0.2

Answer : The encapsulation of transistor is necessary for mechanical ruggedness.

Description : Why inter-coolers are required for multi-stage reciprocating compressors?  

Answer : The intercoolers reduce the temperature of air/gas discharged between stages. Ideally, the intake temperature at each stage should be the same as that at the first stage (referred to a perfect cooling), so that the volume of air to be compressed does not increase and hence reduced power consumption.

Description : Why do you support the five stage method of Herbart? Options: A) In this there is no scope for individual diversity of students. B) Under this, generalization is not required to be done while ... In this method, it is difficult to make co-ordination between various subjects. D) All of these

Answer : D) All of these 

Description : Why is water not suitable for putting out a petrol fire ? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns 

Answer : Water, being heavy, slips below petrol which thus remains in contact with air and burns

Description : Why starter is required for starting an induction motor?

Description : For an ADC, full scale output voltage is about 10 V.For a resolution of about 9.78mV, number of bits required is  A) 6 B) 8 C) 10 D) 12

Description : Timing resistor of a monostable using 555 is 100 kOhm. The timing capacitance (in nF) required for pulsewidth of 100mS is about  A) 100 B) 300 C) 600 D) 900

Answer : DC energy required for satellites is generally derived from Solar cells and nickel-cadmium cells.

Description : For a class A operation, the biasing resistor should be adjusted such that  (A) Q-point never lies (B) Q-point lies in the middle of the load line (C) Q-point lies in the cut off region (D) Q-point lies on the operating region

Description : In the common–emitter transistor circuit, if the current gain is 100 and the collector current is 10 mA, the base current is: (1) 10 µA (2) 100 µA (3) 1 A (4) 10 A 

Answer : In the common–emitter transistor circuit, if the current gain is 100 and the collector current is 10 mA, the base current is: 100 µA

Description : The set of transistor characteristics which enable α to be determined directly from the slope is (a) CB transfer characteristics (b) CE transfer characteristics (c) CB input characteristics (d) CE output characteristics

Answer : The common base transfer characteristics

Description : In a transistor Colpitts oscillator, C1 = 0.001 µF, C2 = 0.01 µF and L = 5 µH. The frequency of oscillation in MHz will be (a) 2.37 MHz (b) 10.00 MHz (c) 11.54 MHz (d) 9.09 MHz 

Answer : c

Description : A transistor has a typical value of β = 200 , If the collector current is 15 mA, then base current will be

Answer : A transistor has a typical value of β = 200 , If the collector current is 15 mA, then base current will be 0.075 mA

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