Mach number is used in connection with the speed of (a) Sound (b) Aircraft (c) Spacecraft (d) Ships

Mach number is used in connection with the speed of (a) Sound (b) Aircraft (c) Spacecraft (d) Ships
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Mach number is significant in (A) Supersonics, as with projectiles and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion through two fluids where there is a surface of discontinuity, gravity force, and wave making effects, as with ship's hulls (D) All of the above

Description : Mach number is significant in (A) Supersonics, as with projectiles and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion through ... gravity force, and wave making effects, as with ship's hulls (D) All of the above

Last Answer : Answer: Option A

Pick out the correct statement. (A) Fanning friction factor is inversely proportional to Reynolds number always (B) The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed (C) Mach number in an incompressible fluid is always unity (D) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

Description : Pick out the correct statement. (A) Fanning friction factor is inversely proportional to Reynolds number always (B) The property of a randomly packed bed (with raschig rings) is given by the ratio of the ... the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

Last Answer : (D) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

Mach number is the ratio of the speed of the (A) Fluid to that of the light (B) Light to that of the fluid (C) Fluid to that of the sound (D) Sound to that of the fluid

Description : Mach number is the ratio of the speed of the (A) Fluid to that of the light (B) Light to that of the fluid (C) Fluid to that of the sound (D) Sound to that of the fluid

Last Answer : (C) Fluid to that of the sound

Froude number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls (D) All of the above

Description : Froude number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion ... gravity forces, and wave making effect, as with ship's hulls (D) All of the above

Last Answer : Answer: Option C

Reynolds number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls (D) All of the above

Description : Reynolds number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion ... gravity forces, and wave making effect, as with ship's hulls (D) All of the above

Last Answer : Answer: Option B

The US is sending a strike force (a bunch of Navy ships including an aircraft carrier) towards North Korea. How about if we start a lottery to guess the date Trump decides to launch cruise missiles at Pyongyang?

Description : The US is sending a strike force (a bunch of Navy ships including an aircraft carrier) towards North Korea. How about if we start a lottery to guess the date Trump decides to launch cruise missiles at Pyongyang?

Last Answer : I’ll guess Tuesday, April 11, to celebrate the day of the week he got more electoral votes than Clinton.

08. The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number. A) Yes B) No

Description : 08. The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number. A) Yes B) No

Last Answer : A

Which term is not associated with sound wave? (1) Hertz (2) Decibel (3) Candela (4) Mach

Description : Which term is not associated with sound wave? (1) Hertz (2) Decibel (3) Candela (4) Mach

Last Answer : (3) Candela Explanation: Candela is the standard unit of luminous intensity, the luminous power per unit solid angle emitted by a point light source in a particular direction, in the International System of Units. The word candela means candle in Latin.

Which term is not associated with sound wave? (1) Hertz (2) Decibel (3) Candela (4) Mach

Description : Which term is not associated with sound wave? (1) Hertz (2) Decibel (3) Candela (4) Mach

Last Answer : Candela

If spacecraft is moving at the speed of light then why the age of the person in spacecraft will not change ?

Description : If spacecraft is moving at the speed of light then why the age of the person in spacecraft will not change ?

Last Answer : Because light has no time. Time is fixed near the light. So if the spacecraft travels at the speed of light, the person inside will also travel at the speed of light. Time will stop for the man ... and "Special Theory of Relativity". Note: Something with mass can never travel at the speed of light.

How much would a Mach Speed MP3 Player cost?

Description : How much would a Mach Speed MP3 Player cost?

Last Answer : A Mach Speed MP3 Player will vary upon size, memory etc. It would be ideal to check out Amazon.com. There, you can read the review on a product, compare the product prices and be able to return your product if not satisfied.

A two-stage rocket attains a velocity of 3,000 meters per second when it drops the first stage and ignites the second. It consumes 1 kilogram of fuel per second and its exhaust speed is 2,000 meters per second. What is the thrust on the spacecraft? w) 2,000 Newtons x) 3,000 Newtons y) 2,000 Newton-seconds z) 3,000 Newton-seconds

Description : A two-stage rocket attains a velocity of 3,000 meters per second when it drops the first stage and ignites the second. It consumes 1 kilogram of fuel per second and its exhaust speed is 2,000 meters per second. ... ? w) 2,000 Newtons x) 3,000 Newtons y) 2,000 Newton-seconds z) 3,000 Newton-seconds 

Last Answer : ANSWER: W -- 2,000 NEWTONS

The pushbutton on the handset of a ship's sound-powered telephone must be depressed to ______________. A. talk then released to listen B. listen then released to talk C. both talk and listen D. ring the station being called

Description : The pushbutton on the handset of a ship's sound-powered telephone must be depressed to ______________. A. talk then released to listen B. listen then released to talk C. both talk and listen D. ring the station being called

Last Answer : Answer: C

The electrical energy necessary to transmit a person's voice over a sound-powered telephone circuit is obtained from _____________. A. dry cell batteries B. the ship's service switchboard C. the emergency switchboard D. the speaker's voice

Description : The electrical energy necessary to transmit a person's voice over a sound-powered telephone circuit is obtained from _____________. A. dry cell batteries B. the ship's service switchboard C. the emergency switchboard D. the speaker's voice

Last Answer : Answer: D

The sound power level of a jet plane flying at a height of 1 km is 160 dB. What is the maximum sound pressure level on the ground directly below the plane assuming that the aircraft radiates sound equally in all directions? A. 59.1 dB B. 69.1 dB C. 79.1 dB D. 89.1 dB

Description : The sound power level of a jet plane flying at a height of 1 km is 160 dB. What is the maximum sound pressure level on the ground directly below the plane assuming that the aircraft radiates sound equally in all directions? A. 59.1 dB B. 69.1 dB C. 79.1 dB D. 89.1 dB

Last Answer : D. 89.1 dB

Cp /Cv is termed as (A) Adiabatic constant (B) Mach number (C) Weber number (D) Prandtl number

Description : Cp /Cv is termed as (A) Adiabatic constant (B) Mach number (C) Weber number (D) Prandtl number

Last Answer : (A) Adiabatic constan

The ratio of inertial forces to gravity forces is called the __________ number. (A) Mach (B) Froude (C) Euler (D) Weber

Description : The ratio of inertial forces to gravity forces is called the __________ number. (A) Mach (B) Froude (C) Euler (D) Weber

Last Answer : (B) Froude

The co-efficient of drag and lift for an incompressible fluid depends on the (A) Reynolds number (B) Froude number (C) Mach number (D) All (A), (B) and (C)

Description : The co-efficient of drag and lift for an incompressible fluid depends on the (A) Reynolds number (B) Froude number (C) Mach number (D) All (A), (B) and (C)

Last Answer : (A) Reynolds numbe

For ideally incompressible fluid, the Mach number will be(A) 1.5 (B) 1 (C) 0 (D) 5

Description : For ideally incompressible fluid, the Mach number will be (A) 1.5 (B) 1 (C) 0 (D) 5

Last Answer : (B) 1

Pick out the wrong statement. (A) The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). ∆p (B) In the equation, T. gc = k. (du/dy) n the value of 'n' for pseudoplastic and Dilatant fluid are < 1 and >1 respectively (C) Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion (D) With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

Description : Pick out the wrong statement. (A) The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). ∆p (B) In the equation, T. gc = k. ... to motion (D) With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

Last Answer : (D) With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

The temperature in isentropic flow (A) Does not depend on Mach number (B) Depends on Mach number only (C) Cannot drop and then increase again downstream (D) None of these

Description : The temperature in isentropic flow (A) Does not depend on Mach number (B) Depends on Mach number only (C) Cannot drop and then increase again downstream (D) None of these

Last Answer : (B) Depends on Mach number only

Ratio of pressure and inertia force gives __________ number. (A) Weber (B) Mach (C) Euler (D) Froude

Description : Ratio of pressure and inertia force gives __________ number. (A) Weber (B) Mach (C) Euler (D) Froude

Last Answer : (C) Euler

Which of the following denotes the effect of compressibility in fluid flow? (A) Weber number (B) Mach number (C) Euler number (D) Reynolds number

Description : Which of the following denotes the effect of compressibility in fluid flow? (A) Weber number (B) Mach number (C) Euler number (D) Reynolds number

Last Answer : (B) Mach numbe

Pick out the correct statement pertaining to the flow through a converging-diverging tube. (A) The value of Mach number is always unity at the throat (B) No shock wave develops in the tube when the Mach number at exit is greater than unity (C) Throughout the converging portion of the tube, the density increases in the downstream direction (D) None of these

Description : Pick out the correct statement pertaining to the flow through a converging-diverging tube. (A) The value of Mach number is always unity at the throat (B) No shock wave develops in the tube ... the converging portion of the tube, the density increases in the downstream direction (D) None of these

Last Answer : (B) No shock wave develops in the tube when the Mach number at exit is greater than unity

Upto what value of 'Mach number', a fluid may be considered as incompressible? (A) 0.03 (B) 0.3 (C) 3(D) 10

Description : Upto what value of 'Mach number', a fluid may be considered as incompressible? (A) 0.03 (B) 0.3 (C) 3 (D) 10

Last Answer : (D) 10

The Mach number for hypersonic flow of compressible fluid is (A) 1 (B) > 1 (C) > 4 (D) < 2

Description : The Mach number for hypersonic flow of compressible fluid is (A) 1 (B) > 1 (C) > 4 (D) < 2

Last Answer : (C) > 4

The ratio of inertial forces to elastic forces is called the __________ number. (A) Reynolds (B) Mach (C) Euler (D) Weber

Description : The ratio of inertial forces to elastic forces is called the __________ number. (A) Reynolds (B) Mach (C) Euler (D) Weber

Last Answer : (B) Mach

Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. (A) Elastic (B) Viscous (C) Gravity (D) None of these

Description : Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. (A) Elastic (B) Viscous (C) Gravity (D) None of these

Last Answer : (A) Elastic

The ratio of inertial forces to elastic forces is called the __________ number. (A) Reynolds (B) Mach (C) Euler (D) Weber

Description : The ratio of inertial forces to elastic forces is called the __________ number. (A) Reynolds (B) Mach (C) Euler (D) Weber

Last Answer : (B) Mach

Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. (A) Elastic (B) Viscous (C) Gravity (D) None of these

Description : Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. (A) Elastic (B) Viscous (C) Gravity (D) None of these

Last Answer : A) Elastic

In case of supersonic flow of a fluid through pipeline, the 'Mach number' is (A) 0 (B) 1 (C) < 1 (D) > 1

Description : In case of supersonic flow of a fluid through pipeline, the 'Mach number' is (A) 0 (B) 1 (C) < 1 (D) > 1

Last Answer : (D) > 1

Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible? (A) < 0.3 (B) > 3 (C) 50 (D) 1

Description : Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible? (A) < 0.3 (B) > 3 (C) 50 (D) 1

Last Answer : (A) < 0.3

Ratio of inertial forces to surface tension forces is called the __________ number. (A) Euler (B) Froude (C) Mach (D) Weber

Description : Ratio of inertial forces to surface tension forces is called the __________ number. (A) Euler (B) Froude (C) Mach (D) Weber

Last Answer : (D) Weber

The ratio of inertial forces to viscous forces is called the __________ number. (A) Weber (B) Mach (C) Froude (D) Reynold

Description : The ratio of inertial forces to viscous forces is called the __________ number. (A) Weber (B) Mach (C) Froude (D) Reynold

Last Answer : (D) Reynold

The ratio of pressure forces to inertial forces is called the __________ number. (A) Froude (B) Euler (C) Reynold (D) Mach

Description : The ratio of pressure forces to inertial forces is called the __________ number. (A) Froude (B) Euler (C) Reynold (D) Mach

Last Answer : (B) Euler

__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical. (A) Mach (B) Reynolds (C) Froude (D) Weber

Description : __________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical. (A) Mach (B) Reynolds (C) Froude (D) Weber

Last Answer : (C) Froude

When the Mach number is less than unity, the flow is called (A) Sub-sonic flow (B) Sonic flow (C) Super-sonic flow (D) Hyper-sonic flow

Description : When the Mach number is less than unity, the flow is called (A) Sub-sonic flow (B) Sonic flow (C) Super-sonic flow (D) Hyper-sonic flow

Last Answer : Answer: Option A

Ratio of inertia force to elastic force is known as (A) Mach number (B) Froude number (C) Reynolds number (D) Weber's number

Description : Ratio of inertia force to elastic force is known as (A) Mach number (B) Froude number (C) Reynolds number (D) Weber's number

Last Answer : Answer: Option A

Ratio of inertia force to surface Jension is known as (A) Mach number (B) Froude number (C) (D) Weber's number

Description : Ratio of inertia force to surface Jension is known as (A) Mach number (B) Froude number (C) (D) Weber's number

Last Answer : Answer: Option D

The ratio of the inertia force to the elastic force is called (A) Reynold's number (B) Froude's number (C) Weber's number (D) Mach number

Description : The ratio of the inertia force to the elastic force is called (A) Reynold's number (B) Froude's number (C) Weber's number (D) Mach number

Last Answer : Answer: Option D

When the Mach number is more than 6, the flow is called (A) Sub-sonic flow (B) Sonic flow (C) Super-sonic flow (D) Hyper-sonic flow

Description : When the Mach number is more than 6, the flow is called (A) Sub-sonic flow (B) Sonic flow (C) Super-sonic flow (D) Hyper-sonic flow

Last Answer : Answer: Option D

For hypersonic flow, the Mach number is (A) Unity (B) Greater than unity (C) Greater than 2 (D) Greater than 4

Description : For hypersonic flow, the Mach number is (A) Unity (B) Greater than unity (C) Greater than 2 (D) Greater than 4

Last Answer : Answer: Option D

A flow is called sub-sonic, if the Mach number is (A) Less than unity (B) Unity (C) Between 1 and 6 (D) More than 6

Description : A flow is called sub-sonic, if the Mach number is (A) Less than unity (B) Unity (C) Between 1 and 6 (D) More than 6

Last Answer : Answer: Option A

The value of bulk modulus of a fluid is required to determine (A) Reynold's number (B) Froude's number (C) Mach number (D) Euler's number

Description : The value of bulk modulus of a fluid is required to determine (A) Reynold's number (B) Froude's number (C) Mach number (D) Euler's number

Last Answer : Answer: Option C

A flow is called hyper-sonic, if the Mach number is (A) Less than unity (B) Unity (C) Between 1 and 6 (D) None of these

Description : A flow is called hyper-sonic, if the Mach number is (A) Less than unity (B) Unity (C) Between 1 and 6 (D) None of these

Last Answer : Answer: Option D

A flow is called super-sonic if the (A) Velocity of flow is very high (B) Discharge is difficult to measure (C) Mach number is between 1 and 6 (D) None of these

Description : A flow is called super-sonic if the (A) Velocity of flow is very high (B) Discharge is difficult to measure (C) Mach number is between 1 and 6 (D) None of these

Last Answer : Answer: Option C

When the Mach number is between __________ the flow is called super-sonic flow. (A) 1 and 2.5 (B) 2.5 and 4 (C) 4 and 6 (D) 1 and 6

Description : When the Mach number is between __________ the flow is called super-sonic flow. (A) 1 and 2.5 (B) 2.5 and 4 (C) 4 and 6 (D) 1 and 6

Last Answer : Answer: Option D

The molecular number density of an ideal gas at standard temperature and pressure in cm3  a. Froude number  b. Loschmidt number  c. Mach number  d. Reynold number

Description : The molecular number density of an ideal gas at standard temperature and pressure in cm3  a. Froude number  b. Loschmidt number  c. Mach number  d. Reynold number

Last Answer : Loschmidt number

You are flying at a constant FL 290 and a constant mach number. The total temperature increases by 5°. The CAS will: a. Remain approximately constant b. Increase by 10 kts c. Decrease by 10 kts d. Will increase or decrease depending on whether you are above or below ISA

Description : You are flying at a constant FL 290 and a constant mach number. The total temperature increases by 5°. The CAS will: a. Remain approximately constant b. Increase by 10 kts c. Decrease by 10 kts d. Will increase or decrease depending on whether you are above or below ISA

Last Answer : a. Remain approximately constant

You are flying at a constant FL 290 and a constant mach number. The total temperature increases by 5°. The CAS will: a. Remain approximately constant b. Increase by 10 kts c. Decrease by 10 kts d. Will increase or decrease depending on whether you are above or below ISA

Description : You are flying at a constant FL 290 and a constant mach number. The total temperature increases by 5°. The CAS will: a. Remain approximately constant b. Increase by 10 kts c. Decrease by 10 kts d. Will increase or decrease depending on whether you are above or below ISA

Last Answer : a. Remain approximately constant