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3 years ago

What Advantage does a voltmeter have over a noncontact voltage indicator when testing for voltage

Engineering

1 answer:

galina1969 [7]3 years ago

5 0

Answer:

Obviously you shouldn't rely just on the meter for your safety. You'd disconnect wall fuses or kill main switches before you start, using the meter just gives you some extra protection: with the meter you might notice for example that you've disconnected the wrong fuse and the unit is still live.

Explanation:

Hope it helps! :)

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A closed rigid tank contains water initially at 10,000 kPa and 520ºC and is cooled to a final temperature of 270° C. Determine t

jasenka [17]

Answer:

final pressure is 6847.41 kPa

Explanation:

given data:

$P_1 = 10,000 kPa$

$T_1 =520\ degree\ celcius = 793 K$

$T_2 = 270 degree celcius = 543 K$

as we can see all temperature are more than 100 degree, it mean this condition is refered to superheated stream

for ischoric process we know that

$\frac{P_1}{T_1} =\frac{P_2}{T_2}$

$\frac{10*10^6}{793} = \frac{P_2}{543}$

$P_2 = 6.84741*10^6 Pa$

final pressure is 6847.41 kPa

5 0

3 years ago

8. Air at 25C, 100 kPa and air at 50C, 200 kPa at 1 to 1 volume ratio are mixed inside an adiabatic compressor to 55C, 500 kPa a

quester [9]

Answer:

Workdone, w = 68.935 kJ

Explanation:

m1h1 + m2h2 + Q = m3h3 - Wc

Final mass of mixture,

m3 = m1 + m2 = 5kg

p1V1 = m1R1T1

p2V2 = m2R2T2

Since they are at 1:1,

V1 = V2 and R1 = R2

Comparing equations,

p1/p2 = (m1/m2) x (T1/T2)

m1/m2 = (100/200) x ((50 + 273)/(25+273))

m1/m2 = 0.542

m1 = 0.542m2

m3 = m1 + m2

5 = m2 + 0.542m2

m2 = 3.243kg

m1 = 1.757 kg

Workdone is given as,

Wc = m3h3 - m1h1 - m2h2

h = Cp x T, since air is an ideal gas

Cp = 1.005kJ/kGK

Wc = (5 x 1.005 x (55+273)) - (1.757 x 1.005 x 298) -(3.243 x 1.005 x 323)

Wc = 68.935 kJ

8 0

4 years ago

I have to invent something for people 65pluse so I need to know what are something old people would bye.

erastova [34]

Phones would be a great thing.

3 0

3 years ago

An ideal Carnot engine extracts of heat from a high-temperature reservoir at 1200 during each cycle, and rejects heat to a low-t

Brut [27]

Answer:

efficiency of the engine is 0.4167

Explanation:

given data

T high = 1200 K

T low = 700 K

solution

we get here efficiency that is express as

efficiency = $1 - \frac{T\ low}{T \ high }$ .........................1

put here value of both temperature we get efficiency

efficiency = 1 - $\frac{700}{1200}$

efficiency = 1 - 0.58333

efficiency = 0.4167

so efficiency of the engine is 0.4167

3 0

3 years ago

Wich muscle in your body are affected by alcohol first

mr Goodwill [35]

Answer:

Brain

Explanation:

<h3><em>Thirty seconds after your first sip, alcohol races into your brain. It slows down the chemicals and pathways that your brain cells use to send messages. That alters your mood, slows your reflexes, and throws off your balance.</em></h3>

8 0

3 years ago