The transconductance of a JFET is computed at constant VDS by: Ratio of change in Id to change of Vgs
Description : The operation of a JFET involves (A) A flow of minority carriers (B) a flow 0f majority carriers (C) recombination (D) negative resistance
Last Answer : The operation of a JFET involves a flow 0f majority carriers
Description : JFET in properly biased condition acts as a: (1) Current controlled current source (2) Voltage controlled voltage source (3) Voltage controlled current source (4) Impedance controlled current source
Last Answer : JFET in properly biased condition acts as a: Voltage controlled current source.
Description : In a JFET drain current is maximum when VGS is (a) zero (b) negative (c) positive (d) equal to Vp
Last Answer : A
Description : A tube has a transconductance of 800 mhos and a load resistor of 50 kohms. When control grid voltage varies by 6 volts, the plate voltage will vary by what amount?
Last Answer : 240 volts.
Description : Transconductance is a measure of the relationship between what two factors?
Last Answer : The changes in plate current and grid voltage.
Last Answer : In BJT transconductance is the ratio of IC to VBE.
Description : The seven segment arrangement for numerical display on consoles, test meters and other applications can be either ________________. A. UJT or BJT B. BCD or OCD C. JFET or IGFET D. LED or LCD
Last Answer : Answer: D
Description : Which of the following low noise transistors is commonly used at microwave frequencies? A. MOSFET B. GASFET C. MESFET D. JFET
Last Answer : C. MESFET
Description : The transistor with the lowest noise figure in the microwave region is a A. MOSFET B. Dual-gate MOSFET C. JFET D. MESFET
Last Answer : D. MESFET
Description : Why JFET is called a unipolar transistor?
Last Answer : In JFET, the current conduction is either by electrons or holes and controlled by means of an electric field between the gate electrode and the conducting channel of the device, So it is called as a unipolar transistor.
Description : What is the importance of JFET?
Last Answer : A JFET acts like a voltage controlled device i.e. input voltage controls the output current. This is different from ordinary transistor where input current controls the output current. JFET has higher input impedance than that of a conventional transistor.
Description : What is pinch off voltage in JFET?
Last Answer : Pinch off voltage (VP): It is the minimum drain source voltage at which the drain current essentially becomes constant.
Description : What is JFET?
Last Answer : A junction FET is a three terminal semiconductor device in which current conduction is by one type of carrier (i.e.) electrons or holes.
Description : When compared to the JFET, what is the input impedance of the MOSFET?
Last Answer : The MOSFET has a higher input impedance.
Description : The input and output signals of a JFET amplifier have what phase relationship?
Last Answer : They are 180 degrees out of phase.
Description : What is the normal current path in an N-channel JFET?
Last Answer : From source to drain.
Description : The source and drain of an N-channel JFET are made of what type of material?
Last Answer : N-type material.
Description : What are the two types of JFET?
Last Answer : N-channel and P-channel.
Description : State 2 advantages of JFET over BJT.
Last Answer : Advantages of JFET over BJT: 1) High input impedance 2) Better thermal stability 3) Produce less noise 4) Smaller than BJT 5) Rugged in construction and simpler to fabricate 6) High degree of isolation between Input and Output.
Description : Draw the transfer characteristics for N-channel JFET.
Last Answer : Transfer characteristics for N-channel JFET:
Description : Sketch p-channel JFET construction.
Last Answer : p- channel JFET constructional diagram:
Description : Sketch construction of N-channel JFET and explain its operating principle.
Last Answer : Construction of N-channel JFET: Working of N channel FET: a)when VGS is zero,ID flows because of VDS b)Now when VGS increases towards negative, depletion layer also increases on both sides. c)so VGS control drain current ID d)so it is called as field effect Transistor
Description : State advantages of MOSFET over JFET.
Last Answer : ➨It can be operated in either enhancement mode or depletion mode. ➨MOSFET have much higher input impedance compare to JFET. ➨They have high drain resistance due to lower resistance of channel. ➨It is easy to manufacture. ➨They support high speed of operation compare to JFETs.
Description : With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
Last Answer : Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage.
Description : Compare JFET with MOSFET.
Last Answer : Particulars JFET MOSFET 1) Type Voltage controlled device Voltage controlled device 2) Mode of operation Operates only in depletion mode Operates in depletion and enhancement ... 6) Gate connection Not isolated from substrate Isolated by SiO2 layer from substrate
Description : Define junction field effect transistor (JFET) and give an example.
Last 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 : Describe operation of N-channel JFET
Last Answer : Operation of N-channel JFET 1) When VGS = 0 volt: When a voltage is applied between the drain and source with a DC supply voltage VDD with VGS = 0 V, the electrons flow from source ... to zero. The gate to source voltage at which current reduces to zero is called as pinch-off voltage.
Description : A depletion MOSFET differs from a JFET in the sense that it has no (A) channel (B) gate (C) P-N junctions (D) substrate
Last Answer : A depletion MOSFET differs from a JFET in the sense that it has no P-N junctions
Description : A JFET has the disadvantage of 1. Having low input impedance 2. Having high output impedance 3. Having small gain band-width product 4. Possessing positive temperature coefficient
Last Answer : A JFET has the disadvantage of Having small gain band-width product
Description : The voltage gain of a common -source JFET amplifier depends up on its (1) Input impedance (2) Amplification factor (3) Dynamic drain resistance (4) Drain load resistance
Last Answer : B
Description : While biasing JFET if drain and source are interchanged, then (A) device will work normally (B) device will get damaged (C) device will work but value of drain current will affected (D) device will not operate at all
Description : The transit time of the current carriers through the channel of a JFET decides it's?
Last Answer : The transit time of the current carriers through the channel of a JFET decides it's gate characteristics.
Description : Is it just a coincidence that the day of the week can be computed as if the Gregorian calendar started on a Sunday in the year 0?
Last Answer : W A A A A Y too much time on your hands, is that a coincidence? ? ?
Description : What do you mean by Computed tomography scan?
Last Answer : A CT Scan combines a series of X-ray images taken from different angles around your body and uses computer processing to create cross sectional images of bones,blood vessels and soft tissue inside your body.
Description : A bomb blast victim presents with nausea and abdominal pain. A Computed Tomography (CT) scan shows no hemorrhage. What treatment should be recommended?
Last Answer : watch for hematoma to develop
Description : An antenna efficiency is computed by using one of the following equations. A. Efficiency = (radiation resistance / transmission resistance) B. Efficiency = (total resistance / radiation resistance) x ... / transmitter output) x 100% D. Efficiency = (radiation resistance / total resistance) x 100%
Last Answer : D. Efficiency = (radiation resistance / total resistance) x 100%
Description : Positive deviation from Raoult's law means a mixture whose total pressure is (A) Greater than that computed for ideality (B) Less than that computed for ideality
Last Answer : (A) Greater than that computed for ideality
Description : For water-ethanol system, the minimum reflux ratio (A) Is computed from the slope of the upper operating line that is tangent to the equilibrium curve (B) Is computed from the intercept of the operating line (C) Cannot be computed (D) Is the optimum reflux ratio
Last Answer : (A) Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Description : CT Scan stand for-----? A. Computed Tomography Scan (Answer) B. Computer Topography Scan C. Computed Topography Scan D. Computer Tomography Scan
Last Answer : A. Computed Tomography Scan (Answer)
Description : Which one of the following techniques is safest for the detection of cancers? (a) Magnetic resonance imaging (MRI) (b) Radiography (X-ray) (c) Computed tomography (CT) (d) Histopathological studies
Last Answer : (a) Magnetic resonance imaging (MRI)
Description : A CPA who is engaged to prepare an income tax return has a duty to prepare it in such a manner that the tax is: a. The legal minimum. b. Computed in conformity with generally accepted ... principles. c. Supported by the client's audited financial statements. d. Not subject to change upon audit
Last Answer : The legal minimum
Description : The correct sequence to find H, when D is given is a) D-E-B-H b) D-B-E-H c) It cannot be computed from the data given d) D-H
Last Answer : a) D-E-B-H
Description : It cannot be determined from Gauss law, whereas the remaining options can be computed from Gauss law. 10. Gauss law for magnetic fields is given by a) Div(E) = 0 b) Div(B) = 0 c) Div(H) = 0 d) Div(D) = 0
Last Answer : b) Div(B) = 0
Description : The divergence theorem for a surface consisting of a sphere is computed in which coordinate system? a) Cartesian b) Cylindrical c) Spherical d) Depends on the function
Last Answer : d) Depends on the function
Description : The area of sphere can be computed from the sphere volume. State True/False. a) True b) False
Last Answer : a) True
Description : Which of the following quantities are computed by using the hydraulic radius for non-circular ducts? (A) Velocity and relative roughness (B) Head loss and velocity (C) Reynold number, relative roughness and head loss (D) Reynolds number and friction factor
Last Answer : (C) Reynold number, relative roughness and head loss
Description : Grams of butane (C4H10 ) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be (A) 580 (B) 640 (C) 1160 (D) Data insufficient; can't be computed
Last Answer : (C) 1160
Description : The process of the JobTracker creates one map task for each computed input split by the user node and assigns the map tasks to the execution slots of the TaskTrackers is called as a) Task Execution b) Task Running Check c) Job Submission d) Task Assignment
Last Answer : Task Assignment
Description : A back sight (A) Is always taken on a point of known elevation or can be computed (B) Is added to the known level to obtain the instrument height (C) Taken on an inverted staff is treated as negative (D) All the above
Last Answer : (D) All the above
Description : The distance between terminal points computed from a subsidiary traverse run between them, is generally known, as (A) Traverse leg (B) A base (C) Traverse base (D) All the above
Last Answer : (C) Traverse base