ORDER OF OPERATIONS
How do you calculate 2 + 3 x 7? Is the answer 35 or is the answer 23? To know the correct answer, one must know the correct order of operations with respect to addition, subtraction, multiplication, division, etc.
- Rule 20:
Multiplication and division must be completed before
addition and subtraction.
2 + 3 x 7 = 2 + 21 = 23 is the correct answer to the above question.
How do you calculate (2 + 3) x (7 - 3)? Is the answer 32,
20 or is the answer 14? To know the correct answer, one must know the correct order of operations with respect to addition, subtraction, multiplication, division, and with respect to parenthesis.
- Rule 21:
Expressions in parenthesis are treated as one number
and must be calculated first.
(2 + 3) x (7 - 3) = 5 x 4 = 20 is the correct answer to the above
problem
How would you calculate [3 + 7 - (2 + 3 x 6) +2 x 5 -7 +1]?
- Rule 22:
If parenthesis are enclosed in other parenthesis, work from the inside out.
In the expression,
, the expression (2 + 3 x 6) is the inner most parenthesis and must be calculated first. 2 + 3 x 6 = 2 + 18 = 20.
The expression is now modified to
. The next parenthesis to be calculated is 7 - 20 + 2 x 5 = 7 - 20 + 10 = - 13 + 10 = - 3.
The expression is now reduced to [3 + {-3} - 7 + 1] = 0 - 7 + 1 = - 6.
How would you calculate
.
- Rule 23:
The parenthesis instruct you to simplify the
expression within the parenthesis before you proceed. The division
symbol has the same role as the parenthesis. It instructs you to
treat the quantity above the numerator as if it were enclosed in a
parenthesis, and to treat the quantity below the numerator as if it
were enclosed in yet another parenthesis. When you complete that
task, you have what appears to be two fractions that you are adding.
Not so!
writtenand
multiplication must be completed before addition within each
parenthesis..
= Both
parenthesis have been simplified. Now perform the multiplication to
yield
. The last thing to
do is the addition.
Intex Technologies : Trouble Shooting
Trouble Shooting (Computer Peripherals)
SMPS P4
Q - Why there is no power output from the SMPS? What are the possible causes?
A -
- Check the fuse, AC Input switch.
- Check for UPS for AC output.
- Check main power cable.
- Check the Power socket and Plug Point, It should be attached properly.
- Check the SMPS switch. It should be on.
- Check the power switch on the cabinet. It should be connected properly with Main Board.
- Remove the Processor and Add-on cards from the Main Boards and check if it comes on.
Q - What could be the reason for the SMPS fan rotating?
A -
- Check the RAM. It should be fitted properly.
- Remove the Add-on cards then check the system.
- Check the monitor and its VGA cable.
Q - What could be the reason for my system restarting after some time?
A -
- Check the UPS output in case of variation.
- Check whether SMPS fan is ok and working.
- Check the OS for virus infection.
- Check the Main Boards for bulging capacitors.
- Check the CPU cooler fan. It should be working properly.
- Check the 20 pin connector, fitted tightly with mother board.
- Check your system Earth /Ground.
- Check your UPS out put voltage & Earth.
DVD Player
Q - What could be the reason for "No Power" in the DVD?
A -
- Check if the AC power cord is properly connected.
- Check ON/OFF switch.
Q - Why I am not able to receive any picture when I play the DVD?
A -
- Check if the Video cables are connected properly.
- Refer to your TV manual for correct "video-in" channel selection.
Q - Why do I get distorted pictures?
A -
- Check the disc for fingerprints / scratches and wipe the disc with soft clean cloth.
- Connect DVD player directly to the TV. Make sure the disc is compatible with the DVD player.
- Ensure that the DVD player's TV type (aspect ratio) is set to match that of the TV.
Q - What could be the reason for "No Sound" or distorted sound?
A -
- Adjust the volume
- Check that the speakers are connected properly.
- Check the setting of the DVD player's audio set up.
- Check if the audio format of the selected audio language matches your receiver capabilities.
Q - Why I am not getting audio from the "Digital Output" connection?
A -
- Check the digital connections.
- Check if the audio format of the selected audio language matches your receiver's capabilities.
Q - Why does "No disc" appear on the display when I play a disc?
A -
- Ensure the disc label is facing up.
- Check if the disc is defective by trying another disc.
- Use original CD/DVD/VCD.
- Play the DVD cleaning disc.
Q - Why is the Remote Control unit not responding?
A -
- Check the batteries.
- Direct the remote control towards the sensor at the front of the DVD player.
- Reduce the distance to the player and the remote.
- Check the battery polarity and replace is required.
Q - Picture not coming on CRT/TFT monitor (connected with DVD Player with VGA option)
A -
- Check the monitor if it is power ON.
- Check if the setting in General set up for Video is at PC-VGA.
CRT Monitor
Q - What is Convergence and Mis - convergence?
A - Convergence is the process by which all three electron beams (R, G, &B) come together and strike at a single spot on the surface of the CRT. Precise convergence is necessary as CRT displays work on the principal of additive coloration. When Red light, Green light, and Blue light are added in equal amounts they will form a white spot or line. The absence of all color makes a black spot or line. Variation of the relative strengths of the R, G, and B electron beams creates color variation. When the individual electron beams (R, G, &B) do not converge perfectly mis-convergence occurs. Mis-convergence can be seen as shadows which appear around text and graphic images. Convergence error can be caused by a Mis-alignment or damaged "shadow mask" of the CRT. Convergence can also be caused due to a defective Deflection Yoke. Since convergence highly depends on the electron beam striking the proper place on the CRT surface, mis-alignment of the Shadow Mask and Deflection Yoke could cause this error.
Q - What is Moire effect?
A - A wavy distortion pattern caused by the interference between the dot pitch of the CRT and the picture signal. This distortion pattern may vary depending on the pattern, screen amplitude, contrast, brightness, and other characteristics of the input signal
Q -What is Non-interlaced Scanning Mode?
A - A system where the scanning in a CRT monitor occurs in a sequential or continuous. System using Non - Interlaced scanning contains One Frame and only one Field. By this we are able to produce a clear and crisp Picture. This also reduces flickering Which is observer in systems using interlace scanning. This is also called Progressive Scanning.
Q - What is DPMS?
A - When in standby mode, the BIOS reduces power consumption, by spinning down hard disc and reducing power to turn off the monitors that comply with Video Electronics Standard Organization (VERA) and Display Power Management Signaling (DPMS). While in standby mode, the system can still respond to external interrupts, such as those from keyboards and mice, fax / modems or network adaptors. For example any activity from the key board or mouse brings the system out of Standby mode and immediately restores power to the monitor.
Q - What is Interlaced Scanning Mode?
A - A system by which a television decodes an image - a frame is broken into two fields, odd (1, 3, 5, 7.) and even (2, 4, 6, 8.). A television will scan 60 fields per second with 30 odd and 30 even fields created. By combining the two fields every 1/30 of a second, a frame is created thus creating 30 frames per second - a standard in television broadcasting
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