Pressure of the order of 10''' torr can be measured by
A. Bourdon tube
B. Pirani Gauge
C. micro-manometer
D. ionisastion gauge
Answer: Option D
Solution (By Examveda Team)
Pressures of the order of 10⁻⁷ torr (very high vacuum) are extremely low and cannot be measured by ordinary pressure-measuring devices.A Bourdon tube is used for measuring relatively high pressures and is unsuitable for vacuum measurements.
A micro-manometer is used for small pressure differences but not for very high vacuum ranges.
A Pirani gauge can measure low pressures only up to about 10⁻³ torr.
An ionisation gauge operates on the principle of ionizing gas molecules and is specifically designed to measure very low pressures (high vacuum) of the order of 10⁻⁷ torr and below.
Hence, the correct answer is ionisation gauge.
This Question Belongs to Civil Engineering >> Hydraulics And Fluid Mechanics
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A. 22.5 m/sec.
B. 33 m/sec.
C. 40 m/sec.
D. 90 m/sec.
A. the weight of the body
B. more than the weight of the body
C. less than the weight of the body
D. weight of the fluid displaced by the body
The difference of pressure between the inside and outside of a liquid drop is
A. $${\text{p}} = {\text{T}} \times {\text{r}}$$
B. $${\text{p}} = \frac{{\text{T}}}{{\text{r}}}$$
C. $${\text{p}} = \frac{{\text{T}}}{{2{\text{r}}}}$$
D. $${\text{p}} = \frac{{2{\text{T}}}}{{\text{r}}}$$
A. cannot be subjected to shear forces
B. always expands until it fills any container
C. has the same shear stress.at a point regardless of its motion
D. cannot remain at rest under action of any shear force
Pirani gauges (thermal conductivity) or convectron gauges measures pressure of order of 10 raise to power -4 to 10 torr
McLeod gauges are used to very low pressure (down to 10 raise to power -6 torr)
Ionization gauges suitable for ultra high vacuum( below 10 raise to power -3)
From vacuum to hig(0.6 bar/8.7psi to 7000bar/100000psi) (bouden gauges)
1torr=133.32pa=0.01933psi=0.00133bar =.00132atm
Capsule pressure gauges( very low gas pressure (UpTo 0.6bar/8.7psi)
Diaphragm pressure gauge (low to medium pressure (-1 to 40bar)
1bar=14.504psi=100000pascals=750.062torr
Bellows gauges 0.1mbar to 16 bar
Plz discuss all the pressure measurement gauge