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Explain open emitter BJT drive circuit.
asked
Feb 19, 2018
by
anonymous
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Apr 21, 2018
by
anonymous
Explain open emitter BJT drive circuit.
open
emitter
bjt
drive
circuit
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1
Answer
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Feb 20, 2018
by
anonymous
open emitter BJT drive circuit:
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asked
Jun 18, 2018
by
anonymous
If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be
If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55
Last answer:
If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98
bjt
emitter
current
common
base
gain
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1
asked
Feb 19, 2018
by
anonymous
Explain MOSFET gate drive circuit and totem pole configuration.
Explain MOSFET gate drive circuit and totem pole configuration.
Last answer:
MOSFET gate drive circuit: The turning on and turning off of MOSFET can be controlled from gate to source voltage signal. If the gate to source voltage of MOSFET exceeds threshold ... this configuration, the two switches (transistors) are used in totem pole arrangement with a comparator.
mosfet
gate
drive
circuit
totem
pole
configuration
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2
asked
Feb 19, 2018
by
anonymous
Explain DC coupled drive circuit with unipolar output.
Explain DC coupled drive circuit with unipolar output.
Last answer:
DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms
dc
coupled
drive
circuit
unipolar
output
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3
asked
Feb 19, 2018
by
anonymous
Explain thyristor gate drive circuit.
Explain thyristor gate drive circuit.
Last answer:
Thyristor Gate Drive Circuit: The thyristor can be turned on by pulse voltage signal at gate terminal and it does not require continuous drive signal like the transistor. The gate ... circuit provide required minimum gate voltage and gate current then the thyristor conducts properly.
thyristor
gate
drive
circuit
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asked
Nov 14, 2017
by
anonymous
basic gate drive circuit of GTO
basic gate drive circuit of GTO
Last answer:
basic gate drive circuit of GTO
basic
gate
drive
circuit
gto
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5
asked
Jun 29, 2019
by
anonymous
Describe the difference between an open circuit and a short circuit.
Describe the difference between an open circuit and a short circuit.
Last answer:
Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit
describe
the
difference
between
an
open
circuit
and
a
short
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6
asked
Apr 25, 2018
by
anonymous
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is ...
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W
Last answer:
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W
dc
open
circuit
voltage
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7
asked
Mar 21, 2018
by
anonymous
It is required to measure the true open circuit e.m.f. of a battery. The best device is?
Last answer:
It is required to measure the true open circuit e.m.f. of a battery. The best device is D.C. potentiometer.
measure
open
circuit
emf
battery
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105
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8
asked
Mar 19, 2018
by
anonymous
During open circuit test of a transformer?
During open circuit test of a transformer?
Last answer:
During open circuit test of a transformer primary is supplied rated voltage.
open
circuit
test
transformer
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1
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9
asked
Sep 27, 2017
by
anonymous
in open circuit or no load test of transformer which side is open circuited?
Last answer:
High Voltage side is open circuited.
transformer
open
circuit
test
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10
asked
Sep 27, 2017
by
anonymous
in open circuit or no load test of transformer which side is low voltage side and which side is high voltage side?
Last answer:
Primary side is low voltage side and secondary side is high voltage side.
open
circuit
test
transformer
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11
asked
Mar 11, 2018
by
anonymous
Explain transformer isolated drive circuits providing both signal and power.
Explain transformer isolated drive circuits providing both signal and power.
transformer
isolated
drive
circuits
signal
power
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12
asked
Feb 6, 2018
by
anonymous
Explain the formation of parasitic BJT and parasitic diode in Power MOSFET.
Explain the formation of parasitic BJT and parasitic diode in Power MOSFET. Can parasitic diode be used in same power electronics applications?
Last answer:
Parasitic Diode: The parasitic diode is in between drain and source. The MOSFET structure itself contains parasitic diode or body drain diode. This parasitic diode allows the reverse flow of current when the ... of MOSFET as a BJT collector. Parasitic BJT operates in the cut-off region.
parasitic
diode
bjt
power
mosfet
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asked
Sep 15, 2017
by
anonymous
Explain the on state losses in power BJT.
Explain the on state losses in power BJT.
Last answer:
On state losses in power BJT: Transistor have four types of losses one is turn on state losses second is turn off state losses third is turn on switching losses and fourth is turn ... ON = VCE sat x IC With increasing collector current collector to emitter saturation voltage increases.
bjt
on
state
losses
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14
asked
Mar 11, 2018
by
anonymous
What is the need for electrically isolated drive circuits?
What is the need for electrically isolated drive circuits?
electrically
isolated
drive
circuits
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15
asked
Mar 11, 2018
by
anonymous
What are the fundamental requirements of gate drive ICs?
What are the fundamental requirements of gate drive ICs?
fundamental
gate
drive
ics
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16
asked
Sep 4, 2018
by
anonymous
Why common emitter configuration is commonly used?
Why common emitter configuration is commonly used?
Last answer:
Common emitter configuration is commonly used for amplifications because 1. The common emitter configuration (CE) provides maximum voltage and current gain and hence provides maximum power gain. The ... automatic impedance matching maximum power transfer will take place from one stage to other.
common
emitter
configuration
commonly
used
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17
asked
Apr 30, 2018
by
anonymous
The ac bypassing of RF by CF in a common emitter configuration :
The ac bypassing of RF by CF in a common emitter configuration : (A) increases ac signal across emitter -base junction (B) decreases ac signal across emitter -base junction (C) decreases voltage amplification (D) stabilizes the Q -point
Last answer:
The ac bypassing of RF by CF in a common emitter configuration : increases ac signal across emitter -base junction
ac
common
emitter
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18
asked
Mar 22, 2018
by
anonymous
What is emitter biasing?
What is emitter biasing?
emitter
biasing
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19
asked
Apr 27, 2020
by
anonymous
Explain the open delta (delta-delta) test on transformer.
Explain the open delta (delta-delta) test on transformer.
open
delta
delta-delta
test
transformer
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20
asked
Apr 28, 2018
by
anonymous
Which phenomenon is present in thyristors but absent in BJT, MOSFET and IGBT ?
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
thyristors
bjt
mosfet
igbt
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21
asked
Feb 20, 2018
by
anonymous
What is the difference between beta and forced beta for BJT?
What is the difference between beta and forced beta for BJT?
difference
between
bjt
beta
forced
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22
asked
Feb 3, 2018
by
anonymous
Operating frequency of power MOSFET is higher than that of power BJT. Justify the statement.
Operating frequency of power MOSFET is higher than that of power BJT. Justify the statement.
Last answer:
Power MOSFET have high turning on and turning off capability high switching speed of MOSFET is due to the high rate of change of drain voltage. The switching losses of power MOSFET ... lower frequency. Hence, operating frequency of power MOSFET is higher than that of power BJT.
mosfet
bjt
frequency
operating
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23
asked
Nov 10, 2017
by
anonymous
Compare BJT, MOSFET and IGBT .
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.
compare
bjt
mosfet
igbt
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24
asked
Sep 15, 2017
by
anonymous
why IGBT is preferred as a power switch over both power BJT and MOSFET?
Last answer:
Because it has a higher switching frequency and heat tolerance.
igbt
bjt
mosfet
power
switch
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110
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25
asked
Sep 13, 2017
by
anonymous
why igbt is used instead of bjt and mosfet?
Last answer:
ON state losses of IGBT is less as compared to MOSFET and BJT.
igbt
bjt
mosfet
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1
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26
asked
Sep 5, 2018
by
anonymous
Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJT.
Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJT.
Last 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.
voltage
divider
biasing
advantages
bjt
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1
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27
asked
Jul 6, 2019
by
anonymous
Adjustable-speed drive
Adjustable-speed drive
Last answer:
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
adjustable-speed
drive
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1
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28
asked
Apr 28, 2018
by
anonymous
In an adjustable speed ac drive which quantity gets reduced above rated speed ?
In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
Last answer:
In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
adjustable
speed
ac
drive
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72
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1
answer
29
asked
Mar 20, 2018
by
anonymous
For constant torque drive which speed control method is preferred ?
Last answer:
For constant torque drive armature voltage control speed control method is preferred.
constant
torque
drive
speed
control
method
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85
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1
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30
asked
Mar 18, 2018
by
anonymous
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
Last answer:
The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.
synchronous
motor
leading
power
factor
drive
mechanical
load
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69
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1
answer
31
asked
Mar 10, 2018
by
anonymous
What is the difference between AC and DC drive?
What is the difference between AC and DC drive?
Last answer:
AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz
difference
between
ac
dc
drive
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132
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1
answer
32
asked
Mar 10, 2018
by
anonymous
What is an electric motor drive?
What is an electric motor drive?
electric
motor
drive
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53
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0
answers
33
asked
Mar 10, 2018
by
anonymous
What is a drive in electrical controls?
What is a drive in electrical controls?
drive
electrical
controls
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60
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0
answers
34
asked
Mar 10, 2018
by
anonymous
What does an electric drive do?
What does an electric drive do?
electric
drive
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44
views
0
answers
35
asked
Mar 10, 2018
by
anonymous
Can a power surge erase a hard drive?
Can a power surge erase a hard drive?
power
surge
erase
hard
drive
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0
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41
views
0
answers
36
asked
Aug 25, 2017
by
anonymous
Scherbius Drive System
Scherbius Drive System
Last answer:
Scherbius Drive System
scherbius
drive
system
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175
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1
answer
37
asked
Aug 25, 2017
by
anonymous
Kramer Drive System
Kramer Drive System
Last answer:
Kramer Drive System Kramer drive is a rotor side speed control drive of induction motor. Slip is the difference between synchronous speed and rotor speed. It is the ... and DC motor. The static Kramer drive is costlier because of the cost of DC motor.
kramer
drive
system
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372
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2
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38
asked
Aug 9, 2017
by
anonymous
Advantages of Variable Frequency Drive (VFD)
Advantages of Variable Frequency Drive (VFD)
Last answer:
Advantages of Variable Frequency Drive (VFD)
advantages
variable
frequency
drive
vfd
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72
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2
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39
asked
Jul 4, 2019
by
anonymous
What are the disadvantages of Open loop control system?
What are the disadvantages of Open loop control system?
Last answer:
Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.
open
loop
system
control
disadvantages
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55
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1
answer
40
asked
Sep 6, 2018
by
anonymous
Why CT is never operated with an open secondary ?
Why CT is never operated with an open secondary ?
Last answer:
CT secondary should never be kept open because it will cause saturation of the core to a high level and very high voltage will appear across the secondary which can breakdown the insulation. One terminal of PT secondary is always grounded to avoid capacitive induction and for human safety
ct
operated
open
secondary
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66
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2
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41
asked
Jun 18, 2018
by
anonymous
What will happen to the gain margin if the gain of the open loop system is doubled?
What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth
Last answer:
What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth
gain
margin
open
loop
system
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143
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1
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42
asked
Apr 30, 2018
by
anonymous
If the gain of the open loop system is doubled, the gain margin
If the gain of the open loop system is doubled, the gain margin (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth
Last answer:
If the gain of the open loop system is doubled, the gain margin Becomes half
open
loop
system
doubled
gain
margin
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345
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1
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43
asked
Mar 25, 2018
by
anonymous
An open resistor, when checked with an ohm-meter reads?
An open resistor, when checked with an ohm-meter reads?
Last answer:
An open resistor, when checked with an ohm-meter reads infinite.
open
resistor
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85
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1
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44
asked
Mar 20, 2018
by
anonymous
Open circuited armature coil of a D.C. machine is?
Last answer:
Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.
open
circuited
armature
coil
dc
machine
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121
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1
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45
asked
Mar 20, 2018
by
anonymous
If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will?
Last answer:
If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.
field
winding
unloaded
salient
pole
synchronous
motor
open
circuited
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115
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1
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46
asked
Mar 10, 2018
by
anonymous
What is an example of an open loop system?
What is an example of an open loop system?
Last answer:
Open loop system. Ex. Electric heater, washing machine, fan, electric switch, etc
example
open
loop
system
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47
asked
Mar 10, 2018
by
anonymous
What are the advantages of open loop control system?
What are the advantages of open loop control system?
Last answer:
Open loop control system are simple to design. Open loop control system are generally stable.
advantages
open
loop
control
system
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90
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48
asked
Dec 4, 2017
by
anonymous
what is open loop and close loop control system?
what is open loop and close loop control system?
Last answer:
A) In open loop system the input is independent of output but output is depends on input. A-1. no feedback path in open loop s/m -2. less accuracy than close loop s/m. Ex. Washing ... -3. high accuracy. Ex. Air conditioner ( AC ), rocket launcher, radar system, etc
open
loop
close
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49
asked
May 21, 2020
by
anonymous
Draw the circuit diagram of battery charger using SCR and explain it’s working.
Draw the circuit diagram of battery charger using SCR and explain it’s working.
Last answer:
Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.
circuit
diagram
battery
charger
scr
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