Engineering - February 2007

2007-02-07 07:49:28 · 7 answers · asked by billy2eagles@rogers.com 1

2007-02-07 07:12:19 · 1 answers · asked by soham 1

I am a final year student of electronics & telecom... eng... want to produce consumer's electronics products.So i don't know which technology i use & from where i get the mechinaries,components & circuit design.

2007-02-07 07:05:49 · 3 answers · asked by soham 1

2007-02-07 06:39:49 · 1 answers · asked by sheikh n 1

I've got two frequencies (converted to a digital signal with a schmitt trigger), however, I need to measure them, preferably using a PICmicro, compare them and output the difference on a multiplexed 7 Segment Display.

2007-02-07 06:22:04 · 2 answers · asked by Alexander M 1

I am installing 2 split air conditioners of 1.5 ton capacity each in a brick walled room of 4725cub.ft.

In Chennai (India) can I connect both the air conditioners to a single phase of a 3-phase electrical connection (the electrical meter on this 3-phase connection is rated 10-40 amps)?

2007-02-07 05:06:01 · 4 answers · asked by shipjenn 1

2007-02-07 04:44:14 · 4 answers · asked by Anonymous

from the corners of the rectangular sheet of tin whose length is twice its width. What size sheet will produce a box having a volume of 112in^3 ?

2007-02-07 04:40:36 · 2 answers · asked by Anonymous

2007-02-07 04:26:50 · 2 answers · asked by naurinbutt 1

Consider a series RC circuit for which R = 7.0 M, C = 3.0 µF, and = 33 V. Find the charge on the capacitor 14 s after the switch is closed.
???????????

2007-02-07 03:49:03 · 1 answers · asked by Anonymous

A lamp (R = 155 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 117 V line.
(a) What total current is supplied to the circuit?
(b) What is the voltage across the fan?
(c) What is the current in the lamp?
(d) What power is expended in the heater?

i m sooo confused,,, i tried all the parts but gettin wrong answers!!!help plz

2007-02-07 03:47:41 · 2 answers · asked by Anonymous

2007-02-07 03:46:04 · 3 answers · asked by ☆Soon 2 be Mom of 2☆ 4

2007-02-07 03:41:32 · 3 answers · asked by John C 1

2007-02-07 03:01:34 · 2 answers · asked by Ray K 1

what does science & math are tools of engineering mean???

2007-02-07 02:53:51 · 4 answers · asked by Anonymous

e.g.
RxLevel for 2G High-rise buildings >= -70dBm.
RxLevel for 2G Low-rise buildings >= -80dBm.

How do we explain the above?

2007-02-07 02:19:14 · 1 answers · asked by LucKY 3

2007-02-07 02:01:39 · 3 answers · asked by onlyme 1

2007-02-07 01:24:52 · 3 answers · asked by zte_eric 1

2007-02-07 00:54:34 · 2 answers · asked by Henny W 1

anything on atmospheric valves,hot wells vacuum pumps,secondary condensers

2007-02-07 00:41:07 · 3 answers · asked by goomizer 1

what are the applications, atleast three,
principles etc

2007-02-07 00:37:24 · 1 answers · asked by aswin 1

1. In selecting the wire size for a line cord, you should remember that
A. No. 16 is larger than No. 12.
B. No. 14 carries more current than No. 18.
C. No. 8 is smaller than No. 10.
D. No. 4 carries less current than No. 6.

2. Which one of the following appliance parts gets the hardest service?
A. Switch
B. Thermostat
C. Heating element
D. Line cord

3. The color used for the hot side of house wiring is
A. green.
B. white.
C. gray.
D. black.

4. An AWG No. 16 line cord with type HPN insulation has an ampacity of
A. 12 amp.
B. 13 amp.
C. 15 amp.
D. 17 amp.

5. To heat a room quickly, some electric room heaters are provided with
A. a heavy metal case.
B. a motor-driven fan.
C. a push-button switch.
D. an automatic thermostat.

6. If the current flowing through an electric heater increases from 6 to 12 amp while the voltage remains the same, the heat produced by the heater will be
A. reduced one-half.
B. unchanged.
C. two times the original heat.
D. four times the original heat.

7. The wires used in a heating element are usually made of
A. copper.
B. steel.
C. aluminum.
D. Nichrome.

8. Why does a thermostat blade bend when heated or cooled?
A. It is made of two different materials.
B. There is a difference in temperature between the blade ends.
C. Different currents are applied to each end.
D. Mechanical pressure is caused by the high resistance.

9. When you are checking an electric heating appliance, the first test made should be for
A. excessive leakage.
B. the normal voltage supply.
C. an open circuit.
D. low resistance.

10. Why should you NOT repair heating elements by soldering?
A. Solder does not conduct electric current.
B. Solder joints are mechanically too weak.
C. Solder melts at the operating temperature of the heater.
D. Soldered joints have too high a resistance.

11. What type of selector switch can be used to control the heat output of three elements connected in parallel?
A. SPST switch
B. DPST switch
C. DPDT switch
D. Shorting-bar-type switch

12. Thermostats used in electric irons differ from those in small room heaters in that they are
A. smaller in size.
B. operative at higher temperatures.
C. connected directly to the appliance plug.
D. mechanically more fragile.

13. How can you clean out the scales in an electric iron without taking the iron apart?
A. By blowing out the holes with compressed air
B. By scraping the tank and tubes with a drill bit
C. By brushing the clogged tubes with a stiff wire brush
D. By rinsing the tank and holes with a water-diluted chemical

14. Bus bars are used in an electric iron as
A. thermostat supports.
B. heat-adjusting resistors.
C. connectors between the thermostat and the element.
D. electrical terminals.

15. The water in a spray iron is prevented from returning to the tank by the action of a
A. suction tube.
B. check valve.
C. water pump.
D. pressure spring.

16. The heating element in an electric iron is in good working order if the resistance across the terminals of the element reads approximately
A. 0 ohms.
B. 15 ohms.
C. 120 ohms.
D. 1000 ohms.

17. Why does the heat of the heating element stop when the desired temperature in an electric iron is reached?
A. The thermostat blade opens electrical contacts.
B. The circuit through the element is closed.
C. The switch bypasses the thermostat.
D. The contacts on the blade touch.

18. Jumpering out the resistors in a resistance-controlled three-speed fan will cause the motor to
A. run at highest speed.
B. run at medium speed.
C. run at lowest speed.
D. stop immediately.

19. A fan equipped with a gearbox is capable of
A. running at three speeds.
B. being tilted downward.
C. oscillating from side to side.
D. reversing the direction of the motor.

20. If the fan blades rattle while the fan is turning, you can stop the noise by
A. oiling the blades.
B. adjusting the blade angles and the blade tip position.
C. tightening the motor end bells and motor mounts.
D. cleaning the blade surfaces.

21. The recommended way to hold a loose hub on a fan is by
A. riveting.
B. soldering.
C. welding.
D. cementing.

22. Quiet operation of a fan depends mostly upon the
A. weight of the blades.
B. material of the blades.
C. motor balance.
D. balance of the blades.

23. The blades of small fans are made of
A. aluminum.
B. steel.
C. tin.
D. copper.

24. A modern variable-speed fan does NOT use
A. a tapped inductor.
B. a multiple-winding motor.
C. an electronic speed control.
D. a dropping resistor.

25. An attic fan, or power ventilator, may have its power inadvertently tapped from
A. an upstairs bathroom.
B. an attic lighting circuit.
C. a basement service.
D. an air conditioning circuit.

2007-02-06 23:42:16 · 2 answers · asked by Chad A 1

your answer should not be superstitious,it should be feasible and implementation worthy

2007-02-06 22:45:05 · 10 answers · asked by Anonymous

2007-02-06 22:35:40 · 1 answers · asked by hem_chan 1

microbiology

2007-02-06 22:18:34 · 1 answers · asked by meenu 1

2007-02-06 21:37:37 · 7 answers · asked by Idiata O 1

In a closed dark room, why is intensity of light bulb higher in late hours of night than in the evening (around 7-8 pm)?

2007-02-06 21:05:16 · 5 answers · asked by cbhagwat211 2

2007-02-06 20:59:59 · 3 answers · asked by abhishek k 1

2007-02-06 20:55:27 · 9 answers · asked by cbhagwat211 2

A parabolic cable hangs between two vertical supports which are 80 m apart. And the depth at the centre of each support is vertically 10m from the supporting level.Taking the lowest point at the point (0, 0), determine the equation of the cable.

2007-02-06 20:09:57 · 2 answers · asked by x 1