Exhaust Velocity MCQs : This section focuses on the "Exhaust Velocity". These Multiple Choice Questions (MCQs) should be practiced to improve the Exhaust Velocity skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
A rocket produces a total thrust of 20,000 N. If the mass flow rate of propellants is 16 kg/s, what will be effective exhaust velocity?
A. 1250 m/s
B. 2500 m/s
C. 625 m/s
D. 5000 m/s
Question 2
Characteristic velocity is a performance parameter that relates to the efficiency of _____
A. nozzle
B. combustion chamber
C. injector
D. casing
Question 3
For a rocket traveling at 700 m/s having an exhaust velocity of 1.4 km/s, exhaust gas density of 0.3 kg/m3, nozzle throat diameter of 0.14 cm and nozzle exit diameter of 25 cm, find the total mass flow rate of the propellants.
A. 6.46 kg/s
B. 103.1 kg/s
C. 20.62 kg/s
D. 32.33 kg/s
Question 4
If C denotes effective exhaust velocity and Isp is specific impulse, then which of them is a better performance parameter?
A. C
B. Isp
C. Both of them are equal
D. Both of them are equivalent
Question 5
If mo denotes initial mass, mb denotes burnout mass, then what is the expression for mass ratio?
A. (mo-mb)/mb
B. (mo-mb)/mo
C. mb/(mo-mb)
D. mb/mo
Question 6
What constitutes the exhaust gas at the nozzle exit of a chemical rocket engine?
A. combustion products of the propellants
B. A mixture of combustion products and surrounding air
C. Surrounding air
D. Propellants
Question 7
What is the characteristic velocity of a rocket if the chamber pressure is 5 MPa, the nozzle throat diameter is 75 mm and the mass flow rate is 25 kg/s?
A. 884 m/s
B. 1768 m/s
C. 3536 m/s
D. 442 m/s
Question 8
What is the nozzle throat diameter of a rocket having chamber pressure (Pc) of 3 MPa, mass flow rate (m) of 20 kg/s and characteristic velocity (c*) of 1500 m/s?
A. 10 cm
B. 11.3 cm
C. 12.8 cm
D. 25 cm
Question 9
Which of the following is not part of a rocket nozzle?
A. Convergent section
B. Divergent section
C. Throat section
D. Staggering section
Question 10
Which of the following variables is not useful in the determination of rocket effective exhaust velocity?
A. Mass flow rate
B. Exhaust velocity
C. Rocket velocity
D. Exit area