The area between base 1 and base 2 in a UJT acts as what type of common circuit component?

The area between base 1 and base 2 in a UJT acts as what  type of common circuit component?
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1 Answer

Answer :

Variable resistor.
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Related questions

The component labeled 'CR1' in the circuit shown in the illustration __________________. EL-0085 A. varies its anode/cathode polarity depending on 'RL' current B. rectifies the varying voltage from the collector of 'Q1' C. acts as a low capacitive reactance to smooth ripple D. establishes a constant reference voltage for the base of 'Q1'

Description : The component labeled 'CR1' in the circuit shown in the illustration __________________. EL-0085 A. varies its anode/cathode polarity depending on 'RL' current B. rectifies the varying voltage from the ... reactance to smooth ripple D. establishes a constant reference voltage for the base of 'Q1'

Last Answer : Answer: D

What is the normal current path for a UJT?

Description : What is the normal current path for a UJT?

Last Answer : From base 1 to the emitter.

The sequential rise in voltage between the two bases of the UJT is called what?

Description : The sequential rise in voltage between the two bases of the UJT is called what?

Last Answer : A voltage gradient

The UJT has how many PN junctions?

Description : The UJT has how many PN junctions?

Last Answer : One.

Which junction acts as the detector in a common-base detector?

Description : Which junction acts as the detector in a common-base detector?

Last Answer : Emitter-base junction.

Draw the circuit and explain the operation of UJT relaxation oscillator.

Description : Draw the circuit and explain the operation of UJT relaxation oscillator. 

Last Answer : Working: When the supply voltage (VCC) is switched ON, the capacitor charges through resistor (R), till the capacitor voltage reaches the voltage level (VP) which is called as peak point voltage. At ... resistor R is shown as a variable resistor. The sweep period is given by the relation

With neat diagram explain synchronized UJT triggering circuit.

Description : With neat diagram explain synchronized UJT triggering circuit.

Last Answer : Line Synchronized UJT triggering circuit: The UJT is almost ideal as a firing device for SCRs. There are 2 main reasons for the compatibility between UJTs and SCRs. Firstly, the UJT produces a ... , the SCR is sure to have the right polarity between the anode and cathode for turning on.

What is the current gain in a common-base circuit called?

Description : What is the current gain in a common-base circuit called?

Last Answer : Alpha (α).

To what circuit arrangement is a common-base detector equivalent?

Description : To what circuit arrangement is a common-base detector equivalent?

Last Answer : A diode detector followed by a stage of audio amplification.

What component in an amplifier circuit tends to limit the low-frequency response of the amplifier?

Description : What component in an amplifier circuit tends to limit the low-frequency response of the amplifier?

Last Answer : The coupling capacitor (C3).

The head driver circuit in a tape recorder’s direct record electronics component (figure 5-1) performs what function?

Description : The head driver circuit in a tape recorder’s direct record electronics component (figure 5-1) performs what function?

Last Answer : It takes the signal from the summing network, amplifies it, and sends it to the record head for recording.

When you are testing individual components in a circuit, what may cause a defective component to appear good?

Description : When you are testing individual components in a circuit, what may cause a defective component to appear good?

Last Answer : A parallel resistor or diode of similar value.

What component of the D’Arsonval meter movement completes the circuit for current flow to the coil?

Description : What component of the D’Arsonval meter movement completes the circuit for current flow to the coil?

Last Answer : Hairspring.

When you are measuring a component using a bridge, what is the most common cause of inaccurate measurements?

Description : When you are measuring a component using a bridge, what is the most common cause of inaccurate measurements?

Last Answer : The capacitive and inductive characteristics of the test leads.

Choose the wrong statement (A) The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface (B) The horizontal component acts through the center of pressure for the vertical projection (C) The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area (D) The vertical component passes through the center of pressure of the volume

Description : Choose the wrong statement (A) The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface (B) The horizontal component ... above the area (D) The vertical component passes through the center of pressure of the volume

Last Answer : Answer: Option D

When replacing component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its base B. there is a danger of phosphor poisoning should 'B''s bulb break C. component 'D' must be closed during the replacement to provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Description : When replacing component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its ... provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Last Answer : Answer: D

When changing out component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its base B. there is a danger of phosphor poisoning should 'B''s bulb break C. component 'D' must be closed during the replacement to provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Description : When changing out component 'B' of the circuit shown in the illustration, it is important to know that ____________. EL-0081 A. it is polarity sensitive and must be inserted as indicated on its ... provide the capacitor's initial charge D. it must match the circuit voltage and component 'C' wattage

Last Answer : Answer: D

What is represented by the two parallel lines within component 'A' of the circuit shown in the illustration? EL-0081 A. A ground connection B. An iron core C. Ventilation openings D. A mounting base

Description : What is represented by the two parallel lines within component 'A' of the circuit shown in the illustration? EL-0081 A. A ground connection B. An iron core C. Ventilation openings D. A mounting base

Last Answer : Answer: B

To perform microminiature component repair, a 2M technician must be currently certified in what area?

Description : To perform microminiature component repair, a 2M technician must be currently certified in what area?

Last Answer : Microminiature component repair.

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

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

Which is the most suitable power device for high frequency ( more 100 kHz) switching application? a) Power MOSFET b) BJT c) SCR d) UJT

Description : Which is the most suitable power device for high frequency ( more 100 kHz) switching application? a) Power MOSFET b) BJT c) SCR d) UJT

Last Answer : Ans: Power MOSFET

Draw the characteristics of UJT and state its working principle.

Description : Draw the characteristics of UJT and state its working principle.

Last Answer : The characteristics of Unijunction Transistor (UJT) can be explained by three parameters: * Cutoff Region * Negative Resistance Region * Saturation Region Cutoff Region : The ... in its ON position. The emitter voltage VE remains almost constant with the increasing emitter current.

State the working principle of UJT

Description : State the working principle of UJT

Last Answer : Figure shows the equivalent circuit of a unijunction transistor with voltage source VEE connected across emitter and base 1 and VBB connected across base 1 and base 2. Hence the Emitter diode is reversed ... emitter current begins to flow ,the UJT is said to be fired, triggered or turned on.

Describe triggering of SCR using UJT relaxation oscillator.

Description : Describe triggering of SCR using UJT relaxation oscillator. 

Last Answer : I need it's operation

State the main difference between PUT and UJT.

Description : State the main difference between PUT and UJT.

Last Answer : Difference between PUT and UJT: (i) The intrinsic stand-off ratio of a UJT is fixed hence operating characteristics cannot be alterd. The PUT, on the other hand has operating characteristics that ... time, which allows faster rise in current and provides healthy output pulses as compared to UJT.

Draw and explain the characteristic of UJT.

Description : Draw and explain the characteristic of UJT. 

Last Answer : UJT Characteristics: The UJT characteristic is emitter voltage versus emitter current characteristic, as shown in the figure. There three operating regions in UJT  1.Cut off region: For ... in IE will place the device into saturation and hence after valley point there is valley point. 

A UJT can........

Description : A UJT can   (A) be triggered by any one of it's three terminals (B) not be triggered (C) be triggered by two of its three terminal only (D) be triggered by all of its terminals only.

Last Answer : A UJT can be triggered by two of its three terminal only

In the emitter characteristic of UJT, the negative resistance portion.

Description : In the emitter characteristic of UJT, the negative resistance portion.  1.lies in the cut-off region 2.continues up to peak point 3.lasts until the valley point is reached 4.does not exist 

Last Answer : In the emitter characteristic of UJT, the negative resistance portion. lasts until the valley point is reached

To turn a UJT ON, the forward bias on emitter diode should be:

Description : To turn a UJT ON, the forward bias on emitter diode should be:  1. more than the peak point voltage 2. less than the peak point voltage 3. Equal to the peak point voltage 4. Equal to the stand - off voltage  

Last Answer : To turn a UJT ON, the forward bias on emitter diode should be: more than the peak point voltage 

A UJT exhibits negative resistance region :

Description : A UJT exhibits negative resistance region : (A) Before the break point (B) Between peak and valley point (C) After the valley point (D) Both (A) and (C)

Last Answer : A UJT exhibits negative resistance region Between peak and valley point

UJT has : -............

Description :  UJT has : -  a) two base leads b) one emitter lead c) two emitter leads and one base lead d) one emitter lead and two base leads

Last Answer :  UJT has : - one emitter lead and two base leads

A UJT has - - - PN Junction

Last Answer : A UJT has one PN Junction

What is the most common type of integrated circuit packaging found in military equipment?

Description : What is the most common type of integrated circuit packaging found in military equipment?

Last Answer : DIPs (dual inline packages).

The varactor is a pn junction that acts as what type of electronic device?

Description : The varactor is a pn junction that acts as what type of electronic device?

Last Answer : Variable capacitor.

What type of force acts ONLY through the center of gravity of a gyro, and does NOT cause precession?

Description : What type of force acts ONLY through the center of gravity of a gyro, and does NOT cause precession?

Last Answer : Force of translation.

If current gain is required from an rf amplifier, what type of component should be used as an output coupling element?

Description : If current gain is required from an rf amplifier, what type of component should be used as an output coupling element?

Last Answer : A step-down transformer.

What is the output current in the common-collector circuit?

Description : What is the output current in the common-collector circuit?

Last Answer : IE.

What is the input current in the common-emitter circuit?

Description : What is the input current in the common-emitter circuit?

Last Answer : Base current (IB).

The large surface area of a waveguide greatly reduces what type of loss that is common in two-wire and coaxial lines?

Description : The large surface area of a waveguide greatly reduces what type of loss that is common in two-wire and coaxial lines?

Last Answer : Copper loss.

What is the responsibility of an auditor who is engaged to audit the financial statements of a government entity? a. Assess control risk with respect to each component of internal control. b. Assume responsibility for assuring that the entity complies with applicable laws and regulations. c. Obtain an understanding of the possible financial statement effects of laws and regulations having direct and material effects on amounts reported. d. Design the audit to provide reasonable assurance that the statements are free of material misstatements resulting from illegal acts having direct or indirect effects

Description : What is the responsibility of an auditor who is engaged to audit the financial statements of a government entity? a. Assess control risk with respect to each component of internal ... the statements are free of material misstatements resulting from illegal acts having direct or indirect effects

Last Answer : Obtain an understanding of the possible financial statement effects of laws and regulations having direct and material effects on amounts reported.

What component in a blocking oscillator controls pulse width?

Description : What component in a blocking oscillator controls pulse width?

Last Answer : Transformer.

What component is in parallel with the output in a parallel limiter?

Description : What component is in parallel with the output in a parallel limiter?

Last Answer : The diode.

What component(s) is/are used for low-frequency compensation for Q2?

Description : What component(s) is/are used for low-frequency compensation for Q2?

Last Answer : R9 and C5.

What compWhat component(s) is/are used for high-frequency compensation for Q1?

Description : What component(s) is/are used for high-frequency compensation for Q1?

Last Answer : L1, L2, and R5.

Which receiver component converts the IF pulses to video pulses?

Description : Which receiver component converts the IF pulses to video pulses?

Last Answer : Detector.

Which component of the receiver produces the signal that is mixed with the received signal to produce the IF signal?

Description : Which component of the receiver produces the signal that is mixed with the received signal to produce the IF signal?

Last Answer : Local oscillator.

What transmitter component allows the radiation of a large number of discrete frequencies over a wide band?

Description : What transmitter component allows the radiation of a large number of discrete frequencies over a wide band?

Last Answer : . Frequency synthesizer.

What radar component permits the use of a single antenna for both transmitting and receiving?

Description : What radar component permits the use of a single antenna for both transmitting and receiving?

Last Answer : Duplexer.

In an electron tube regulator, the electron tube replaces what component?

Description : In an electron tube regulator, the electron tube replaces what component?

Last Answer : Variable resistor.

Which fiber optic component (splice, connector, or coupler) makes a permanent connection in a distributed system?

Description : Which fiber optic component (splice, connector, or coupler) makes a permanent connection in a distributed system?

Last Answer : Splice.