Bissoy.com
Doctors Medicines MCQs Q&A

If the exit pressure is thrice the atmospheric pressure for a rocket A and if it is twice for rocket B, what will be the ratio of pressure thrust of rocket A to that of B?

If the exit pressure is thrice the atmospheric pressure for a rocket A and if it is twice for rocket B, what will be the ratio of pressure thrust of rocket A to that of B? Correct Answer 2

Pressure thrust is the difference between nozzle exit pressure and ambient pressure multiplied by nozzle exit area. Pe = 3Pa for rocket A Pe = 2Pa for rocket B Pressure thrust Tp = (Pe-Pa)Ae So TpA/TpB = 2Pa/Pa = 2.

Related Questions

Rocket A has twice the pressure thrust of rocket B while it has half the momentum thrust as that of B. If the momentum thrust of B is 5 times its pressure thrust, find the ratio of total thrust of A to B.
A rocket has a throat area of 10 mm2 and nozzle exit area of 25 mm2. If the mass flow rate of its propellants is 2 kg/s, exit velocity is 30 m/s, and if exit pressure is twice the standard atmospheric pressure at sea level, what will be the total thrust?
Consider the following statements in connection with thrust bearings: 1) Cylindrical thrust bearings have higher coefficient of friction than ball thrust bearings. 2) Taper rollers cannot be employed for thrust bearings. 3) Double-row thrust ball bearing is not possible 4) Lower race, outer race and retainer are readily separable in thrust bearings. Which of the above statements are correct?
The formula to determine the height of the rocket above the ground at any time during the rocket's flight is given by: h = 119t - 7t2 where t = the time, in seconds, that has elapsed since the rocket was launched, and h = the height, in meters, of the rocket above the ground at time t. The value of h was 0 when the rocket hit the ground. How many seconds after the rocket was launched did it hit the ground?
If the ages of Joe and Andy are added to thrice the age of Mary, the total becomes 79. If the ages of Joe and Mary are added to twice the age of Andy, the total becomes 61 and if the age of Mary is added to thrice the age of Andy and thrice the age of Joe, the total becomes 101. What is the age of Mary?  
Consider the following statements about the Atmospheric pressure phenomenon and identify the correct ones. Atmospheric pressure is basically a force in any area pushed by any surface by the weight of the Earth's atmosphere.  The atmospheric pressure increases with an increase in the altitude for any region.  The earth's rotation affects the pressure of the atmosphere in various ways.
Consider the following statements.
1. SI unit of atmospheric pressure is Nm-2 or pascal and CGS unit is dyne/cm2.
2. The barometer is a device by which the atmospheric pressure is measured.
3. The standard atmospheric pressure is the pressure required of 76 cm of Hg column or 760 mm of Hg column, which is equivalent to 1 atm.
Which of the statements given above is/are correct?
If the divergence angle for a conical nozzle is 30°, nozzle exit diameter is 30 cm, exit pressure is 10% more than the ambient pressure, mass flow rate is 14 kg/s and the jet exhaust velocity is 700 m/s, determine the total thrust of the engine under standard sea level operating conditions.
There are two numbers where the sum of twice the first number and thrice the second number is 100. And the sum of thrice the first number and twice the second number is 120. Which is the largest number?
There are two numbers such that the sum of twice the first number and thrice the second number is 300 and the sum of thrice the first number and twice the second number is 265. Which is the largest number ?