Last Answer : already answered here is mosfet current controlled device?
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172 views
1 answer
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Sep 10, 2017
by
anonymous

Last Answer : Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.
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1.1k views
1 answer
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Sep 10, 2017
by
anonymous

Last Answer : No, BJT is a current controlled device .
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184 views
1 answer
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Sep 10, 2017
by
anonymous

Last Answer : MOSFET are voltage controlled devices.
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151 views
3 answers
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Sep 23, 2017
by
anonymous

Last Answer : BJT is current controlled device.
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144 views
4 answers
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Sep 23, 2017
by
anonymous

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is
Last Answer : Please show the solution for this question
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522 views
2 answers
asked
Apr 29, 2018
by
anonymous

When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is
Last Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2
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1.4k views
1 answer
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Apr 29, 2018
by
anonymous
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Last Answer : In BJT there is movement of electrons and holes accros the junctions which is basicaly current flow.
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364 views
2 answers
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Sep 10, 2017
by
anonymous
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A current controlled voltage source is equivalent to : (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier
Last Answer : A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier
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121 views
1 answer
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Apr 30, 2018
by
anonymous

Last Answer : The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.
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340 views
1 answer
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Mar 21, 2018
by
anonymous

Describe with neat sketch the constructional details of IGBT.
Last Answer : Construction: Insulated gate bipolar transistor or IGBT, is a solid state devices primarily used as an electronic switch which, as it was developed, came to combine high efficiency and fast ... layer and p+ emitter constitute a BJT with a wide base region and hence small current gain.
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248 views
1 answer
asked
May 21, 2020
by
anonymous

Draw construction of IGBT.
Last Answer : construction of IGBT
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363 views
1 answer
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Oct 13, 2019
by
anonymous

Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ? (A) forward conduction (B) latching (C) forward blocking (D) reverse breakdown
Last Answer : Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ? (A) forward conduction (B) latching (C) forward blocking (D) reverse breakdown
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3.2k views
1 answer
asked
Apr 28, 2018
by
anonymous

Compare BJT, MOSFET and IGBT .
Last Answer : BJT MOSFET IGBT BJT is a current controlled device. MOSFET is a voltage controlled device. IGBT is a voltage controlled device. The input impedance of BJT is low. ... is minority carrier device. MOSFET is majority carrier device. IGBT is minority carrier device.
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449 views
1 answer
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Nov 10, 2017
by
anonymous

Last Answer : Because it has a higher switching frequency and heat tolerance.
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143 views
1 answer
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Sep 15, 2017
by
anonymous

Justify the statements. 1. IGBT uses a vertically oriented structure. 2. IGBT is preferred as a power switch over both power BJT and MOSFET. 3. Punch through IGBT structure are more popular and are widely used.
Last Answer : 1. IGBT uses vertically oriented structure. IGBT use vertically oriented structure to reduce the resistance and to increase the current flow area. Hence IGBT uses vertically oriented ... DC circuit applications. Hence punch through IGBT structure are more popular and are widely used.
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1 answer
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Sep 15, 2017
by
anonymous

Also, highlight the problem faced during parallel operation.
Last Answer : Parallel operation of IGBT: Parallel operation of IGBT is done for obtaining high current rating. Paralleling of IGBT reduces conduction losses and thermal stress. IGBT combines the qualities of ... . IGBTs must share losses equally otherwise IGBT may get failure due to thermal differences.
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223 views
1 answer
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Sep 15, 2017
by
anonymous

Last Answer : IGBT is a bipolar device.
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322 views
1 answer
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Sep 13, 2017
by
anonymous

Last Answer : IGBT or Insulated Gate Bi-polar Transistors are typically semiconductor devices aka. controlled switches, which find their applications in Power Electronics circuits such as Inverters, and electrical ... ( buy implementing suitable Pulse Width Modulation scheme ) * Lower cost
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95 views
1 answer
asked
Sep 13, 2017
by
anonymous

Last Answer : IGBT is a bipolar device because current is carried by both holes and electrons.
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136 views
1 answer
asked
Sep 13, 2017
by
anonymous

Last Answer : ON state losses of IGBT is less as compared to MOSFET and BJT.
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142 views
1 answer
asked
Sep 13, 2017
by
anonymous

Give the applications of IGBT
Last Answer : 1) AC and DC motor drives 2) SMPS 3) Inverters 4) Choppers 5) Solid-state Relays 6) solid-state Contactors
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71 views
1 answer
asked
Oct 13, 2019
by
anonymous

The number of terminals present in IGBT is A) 2 B) 3 C) 4 D) 5
Last Answer : The number of terminals present in IGBT is 3
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83 views
1 answer
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Jun 18, 2018
by
anonymous

Last Answer : Yes IGBT is costlier than BJT and MOSFET.
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2.6k views
1 answer
asked
Sep 29, 2017
by
anonymous

State classification of Phase controlled rectifiers.
Last Answer : Classification of phase controlled rectifiers:
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106 views
1 answer
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May 21, 2020
by
anonymous

Single-phase mid-point controlled rectifier with RL load
Last Answer : Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.
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213 views
1 answer
asked
Oct 13, 2019
by
anonymous

Single-phase Midpoint controlled rectifier with Resistive load
Last Answer : Single-phase Midpoint controlled rectifier with Resistive load: 1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.
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619 views
1 answer
asked
Oct 13, 2019
by
anonymous

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
Last Answer : Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.
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897 views
1 answer
asked
Jul 25, 2019
by
anonymous

Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.
Last Answer : Single phase fully controlled half wave converter: The circuit diagram of single-phase half-wave controlled rectifier with RL load and without freewheeling diode is shown in Fig. (a). The SCR T is ... , when again pulse is applied, the SCR is turned on & the above cycle is repeated.
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2 answers
asked
Jul 25, 2019
by
anonymous

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V
Last Answer : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V
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184 views
1 answer
asked
Apr 28, 2018
by
anonymous

The device which allows reverse power flow and withstands highest switch frequency is (A) GTO (B) MOSFET (C) IGBT (D) Inverter grade SCR
Last Answer : The device which allows reverse power flow and withstands highest switch frequency is MOSFET
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89 views
1 answer
asked
Apr 28, 2018
by
anonymous

Application one lamp controlled from two places
Last Answer : Application one lamp controlled from two places: 1. For Stair case wiring 2. Hospital Wiring ( For operating the lamp in room and nursing station) 3. Bedroom Lighting.
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108 views
1 answer
asked
May 7, 2020
by
anonymous

How are nuclear reactors controlled? Explain two different methods in brief.
Last Answer : Nuclear reactor is controlled using control rods: Control rods are made up of very high neutron absorbing material like boron, cadmium. By adjusting height of control rods on reactor core ... of nuclear reaction will increase. Whereas by pushing control rod towards the core it will reduce.
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115 views
2 answers
asked
Sep 8, 2018
by
anonymous

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last Answer : The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases
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237 views
1 answer
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May 1, 2018
by
anonymous

In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals
Last Answer : In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage
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136 views
1 answer
asked
Apr 28, 2018
by
anonymous

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
Last Answer : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25
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2.2k views
1 answer
asked
Apr 27, 2018
by
anonymous

Last Answer : The speed of a locomotive is controlled by gear box.
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88 views
1 answer
asked
Mar 22, 2018
by
anonymous

How many servos can be controlled by Arduino?
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69 views
0 answers
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Mar 15, 2018
by
anonymous

Chopper controlled DC motor
Last Answer : Chopper controlled DC motor
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238 views
1 answer
asked
Aug 25, 2017
by
anonymous
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State any four materials used in fabrication of semiconductor device and describe its need.
Last Answer : For fabrication of semiconductor devices like transistors diode, solar cell etc. we have to make use of following types of materials 1. Substrate: o It is used for deposition of thin ... . o Metal cans and sealed glass containers satisfy the extreme requirements of space and military users.
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63 views
1 answer
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Aug 5, 2019
by
anonymous

Linear and non-linear device
Last Answer : Linear and non-linear device
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123 views
1 answer
asked
May 16, 2019
by
anonymous

Why transistor is called as bipolar device.
Last 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.
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78 views
1 answer
asked
Sep 4, 2018
by
anonymous

Which of the following device is used for coupling microwave energy? A) Resonator B) Waveguide C) Loop D) Antenna
Last Answer : A
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1.2k views
2 answers
asked
Jun 18, 2018
by
anonymous

Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode
Last Answer : Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode
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199 views
1 answer
asked
Jun 18, 2018
by
anonymous

A snubber circuit is connected to the power semiconductor device to reduce the (A) turn-on time (B) turn-off time (C) electrical stresses (D) thermal resistance
Last Answer : A snubber circuit is connected to the power semiconductor device to reduce the electrical stresses
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174 views
1 answer
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Apr 28, 2018
by
anonymous

71 views
0 answers
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Mar 22, 2018
by
anonymous

Last Answer : Wagner earthing device is used to eliminate errors due to electrostatic coupling.
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91 views
1 answer
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Mar 21, 2018
by
anonymous

Last Answer : Basically a potentiometer is a device for comparing two voltages.
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113 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : A damping device prevents the oscillation of the moving system and enables the latter to reach its final position quickly.
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169 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : A switchgear is device used for switching, controlling and protecting the electrical circuit and equipment.
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259 views
1 answer
asked
Mar 20, 2018
by
anonymous
