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Geared Stepping Motors Basic working Principle & Advantages

Monday, 18 May 2015

Working Principle and Advantages of Geared Stepping Motors

Speed reduction package have acquire wide use with the general objectives of accelerating force and reducing speed.
However, they're additionally utilized in combination with stepping motors requiring high positioning preciseness for the sake of higher resolution, lower vibration, high inertia drive, and
downsizing.
Here we are going to justify the benefits of meshed stepping motors examination the case for choosing the motor alone and the case for choosing a meshed sort.
This choice procedure calculates the minimum positioning time and calculates numerous parameters for 2 totally different conditions: once the motor alone is chosen for the drive for the index table within the figure on the left and once a meshed sort motor is chosen.
Therefore, this procedure encompasses a totally different sequence in places
from the choice procedure given below.

Drive Inertia:
The ratio of the moment of inertia of the load converted for the motor output shaft and the moment of inertia rotor is called the inertia ratio and expressed with the following equation :




SEMICONDUCTORS MCQ VIVA Electrical Elentronics Answers

Tuesday, 28 April 2015

SEMICONDUCTORS Devices  MCQ-EEE,CSE,ETE

1. The diode is best described as:
 a) Switch c) Electrical Storage Device
 b) Check Valve d) Electrical Momentum


2. A silicon diode begins to conduct current at
approximately:
a) 7 volts c) 0.7 lb.
b) 0.7 volts d) 7 lbs.

3. NPN transistors have:
a) 2 leads c) 2 diodes
b) 3 leads d) b & c

4. NPN and PNP transistors are used to:
a) Create Power c) Control Current
b) Change Resistance d) Control Capacitance

5. The ratio of collector current to base current in a
transistor is called:
a) Beta (b) c) Current Control
b) Amplification d) FET

6. A diode made of Gallium Arsenide is called:
a) Zener Diode c) LED
b) Power Diode d) Detector Diode

7. A Field Effect Transistor controls Source to Drain
current by:
a) Diode Conduction c) Base Voltage
b) Base Current d) Gate Diode

8. A Zener Diode is used as:
a) Voltage Reference c) Resistance Control
b) Current Reference d) b & c

9. An Integrated Circuit contains:
a) Diodes and Resistors c) Inductors
b) Transistors and Small d) a & b
Capacitors

10. If the arrow in the symbol for a transistor points
toward the base lead, the transistor is a:
a) NPN Transistor c) FET Transistor
b) PNP Transistor

Ans : 1.b 2.b 3.d 4.c 5.a 6.c 7.d 8.a 9.d 10.b
More to FindA at My Hubpages

Types of USB Connectors


Universal Serial Bus Connectors Types


USB-A Connectors

USB-A female  is that the standard “host” instrumentation kind. this can be found on computers, hubs, or any device purported to own peripherals blocked into it. it's additionally attainable to appear out extension cables with a feminine A instrumentation and a male A instrumentation on the opposite finish.

exp:USB-A ports on a laptop computer.

Female USB-A ports on the facet of a moveable laptop computer. The blue instrumentation is USB three.0 compliant.

Different types of  USB pin cofiguration
USB-A male is that the standard “peripheral” instrumentation kind. Most USB cables can have one finish terminating in associate very USB-A male instrumentation, and far of devices (such as keyboards and mice) can have a intrinsic cable terminated with a USB-A male instrumentation. It’s additionally attainable to appear out USB-A male connectors that unit of mensuration board mountable, for devices like USB memory sticks.

USB-A male instrumentation examples

Two sorts of Male USB-A connectors, on a SparkFun hellhound cable ANd associate AVR Stick development board.

USB-B Connectors

USB-B female is a conventional for peripheral devices. It’s bulky, but robust, so in applications wherever size isn't a drag, it’s the popular implies that for providing a removable instrumentation for USB property. it's typically a through-hole board mount instrumentation, for GHB trustiness, however there unit of menstruation panel-mount choices for it still.
exp:USB-B instrumentation working on Arduino Uno device
Arduino boards, to boot as this Uno, have long used the feminine USB-B instrumentation, as a results of its low price and strength.
USB-B male is type of totally found at the very best of a cable. USB-B cables unit of mensuration present and low price, that additionally contributes to the recognition of the USB-B affiliation.

Male USB-B instrumentation

USB-B male instrumentation on the very best of a Spark Fun hellhound cable.Use as
USB-Mini Connectors
The USB-Mini affiliation was the primary ancient commit to deflate the scale of the USB instrumentation for smaller devices. USB-Mini feminine is typically found on smaller peripherals (MP3 players, older cell phones, very little external arduous drives), and is typically a surface mount instrumentation, commerce robustness for size. USB-Mini is slowly being phased are available in favor of the USB-Micro instrumentation.

USB-Mini female instrumentation

USB-Mini female instrumentation on knowledgeable to snap skilled mini.
 
USB-Mini male is another cable-only instrumentation. like USB-B, it’s quite common, and cables is additionally found cheaply concerning anyplace.

USB-Mini male instrumentation

USB-Mini male instrumentation on the very best of a SparkFun hellhound cable.

USB-Micro Connectors

USB-Micro is a fairly recent addition to the USB instrumentation family. like USB-Mini, the first concern is size reduction, however USB-Micro adds a fifth pin for low-speed signalling, permitting it to be utilized in 

USB-OTG (On-the-go) applications wherever a tool might want to manage as either selection or a peripheral looking on circumstances.
 
USB-Micro female is found on a lot of moderen peripherals, like digital cameras and MP3 players. The adoption of USB-micro as a typical charge port for all new cellular phones and pill computers implies that chargers and knowledge cables have gotten extra and extra common, and USB-Micro is probably aiming to follow USB-Mini at intervals the returning years as a results of the small-factor USB instrumentation of alternative.

Basic Difference between Male & Female in Electronics Connectors

Wednesday, 22 April 2015

Basic Difference between Male & Female in Electronics Connectors

Basic distinction Between Male & female in electronics Connectors

Electronic cables typically have male connectors at every finish.All the electronic devices you utilize in your home electronics have connectors that are available male and female elements. This commonplace arrangement ensures that a connecter fits solely with the alternative gender of constant sort, serving to to standardize cables for power, analog and digital signals. The male differs from the female gender in this it's one or additional signal-carrying pins or protrusions; these work snugly in complementary receptacles on the female connecter. 

figure : DB9 Connectors
Terminology and Identification
Technicians discuss with male electrical connectors as plugs, and to females as receptacles, jacks or sockets. In most cases, you'll simply tell a connector's gender: the male half has sticking metal conductors separated by a plastic dielectric. the female has one or additional sockets simply massive enough to simply accept the male pins. AN RCA male connecter, as an example includes a central pin enclosed by a metal shroud; the female includes a cylindrical metal hole that accepts the pin on the within and also the shroud on the skin. BNC connectors, used for radio-frequency instrumentation, ar tougher to tell apart between male and femalevariations, as each have jutting elements.
 
Orientation and Polarity
The elements in male and female connectors ar homeward specified the 2 work tightly along. additionally, several connectors have a pin layout that stops instrumentation from being connected backwards. A polarized wall plug, as an example, has 2 slots: one for warm and one for neutral power, however the neutral slot is wider. as a result of this distinction, you can't insert a two-pronged electrical device into the female backwards. alternative connectors, like those used for Apple's "Lightning," work along in 2 orientations, and each work properly.
Cable and Panel
Although not a strict rule, most cables have male connectors; females are mounted to instrumentation panels. femalesockets usually have a recessed style, permitting AN instrumentation cupboard to possess a comparatively sleek profile freed from protrusions. within the case of the plug, the female panel connecter has most of the hardware behind the front panel; solely a metal washer and a slim nut extend on the far side the panel's surface.
Design
Because male and female connectors work along, they're similar however ne'er identical. the dimensions of the male pin and female receptacle ar inside thousandths of an in. of every alternative, despite the layout. the female accepts the male usually with a coffee insertion force, creating connections straightforward. On some connectors, like the XLR connecter employed in skilled audio instrumentation, the female includes a latch that captures the male, preventing a user from actuation it out accidentally.






how it works computer power supply

Tuesday, 27 January 2015

We'll find out how laptop power provides work and what the power ratings mean.

In a notebook computer (PC), the facility provide is that the metal box typically found in a very corner of the case. the facility provide is visible from the rear of the many systems as a result of it contains the power-cord receptacle and also the cooling fan.

Power provides, typically remarked as "switching power supplies", use whipper technology to convert the AC input to lower DC voltages. the everyday voltages provided are:     3.3 volts, 5 volts,12 volts.









                                                       PC power supply

               
The 3.3- and 5-volts ar generally utilized by digital circuits, whereas the 12-volt is employed to run motors in disk drives and fans. the most specification of an influence provide is in watts. A watt is that the product of the voltage in volts and also the current in amperes or amps. If you've got been around PCs for several years, you almost certainly bear in mind that the initial PCs had massive red toggle switches that had a decent little bit of heft to them. after you turned the laptop on or off, you knew you were doing it. These switches truly controlled the flow of one hundred twenty V power to the facility provide.

­­Today you switch on the facility with a trifle electrical switch, and you switch off the machine with a menu possibility. These capabilities were other to straightforward power provides many years agone. The software system will send a sign to the facility provide to inform it to show off. The electrical switch sends a 5-volt signal to the facility provide to inform it once to show on. the facility provide additionally features a circuit that provides five volts, referred to as VSB for "standby voltage" even once it's formally "off", in order that the button can work. See future page to find out additional concerning whipper technology.

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