Explore topic-wise MCQs in Rocket Propulsion.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Rocket Propulsion knowledge and support exam preparation. Choose a topic below to get started.

1.

If the pressure rise P across a pump is half the discharge pressure, then which of the following relates the suction pressure Ps to discharge pressure pd?

A. P<sub>s</sub> = p<sub>d</sub>
B. P<sub>s</sub> = 2 x P<sub>d</sub>
C. 2 x P<sub>s</sub> = P<sub>d</sub>
D. P<sub>s</sub> = 4 x P<sub>d</sub>
Answer» D. P<sub>s</sub> = 4 x P<sub>d</sub>
Discussion
2.

If L represents torque, and the subscripts T, o, f, b denotes the turbopump, oxidizer pump, fuel pump and bearings respectively, then which of the following expressions is true when there are no gears in a particular turbopump?

A. L<sub>T</sub> = L<sub>o</sub> + L<sub>f</sub> + L<sub>b</sub>
B. L<sub>T</sub> = L<sub>o</sub> x L<sub>f</sub> x L<sub>b</sub>
C. L<sub>T</sub> = L<sub>o</sub> = L<sub>f</sub> = L<sub>b</sub>
D. L<sub>T</sub> = L<sub>o</sub> = L<sub>f</sub> L<sub>b</sub>
Answer» B. L<sub>T</sub> = L<sub>o</sub> x L<sub>f</sub> x L<sub>b</sub>
Discussion
3.

Which of the following expressions is true when there are no gears in a particular turbopump?

A. N<sub>T</sub> = N<sub>o</sub> N<sub>f</sub>
B. N<sub>T</sub> N<sub>o</sub> = N<sub>f</sub>
C. N<sub>T</sub> N<sub>o</sub> N<sub>f</sub>
D. N<sub>T</sub> = N<sub>o</sub> = N<sub>f</sub>
Answer» E.
Discussion
4.

The power is expressed as the product of torque and ____________

A. vehicle speed
B. shaft speed
C. exhaust velocity
D. volume flow rate per unit cross-sectional area
Answer» C. exhaust velocity
Discussion
5.

If power of turbines equals PT, power consumed by pumps is PP and the power consumed by auxiliaries is PA, what is the expression for auxiliary power?

A. P<sub>A</sub> = P<sub>P</sub> P<sub>T</sub>
B. P<sub>A</sub> = P<sub>P</sub> + P<sub>T</sub>
C. P<sub>A</sub> = P<sub>T</sub> P<sub>P</sub>
D. P<sub>A</sub> = P<sub>T</sub> x P<sub>P</sub>
Answer» D. P<sub>A</sub> = P<sub>T</sub> x P<sub>P</sub>
Discussion
6.

If the gear ratio for fuel pump is thrice that of the oxidizer pump, the shaft speed of fuel pump is ____________ the oxidizer pump.

A. half
B. twice
C. thrice
D. one-third
Answer» E.
Discussion
7.

In a turbopump, what are are the gear ratios for ao and af (for oxidizer pump and fuel pump respectively) if no gears are used?

A. 0 for both
B. 1 for both
C. 0 for a<sub>o</sub> and 1 for a<sub>f</sub>
D. 0 for a<sub>f</sub> and 1 for a<sub>o</sub>
Answer» C. 0 for a<sub>o</sub> and 1 for a<sub>f</sub>
Discussion
8.

What is the total mass flow rate through the gas generator if the oxidizer flow through it is 15 kg/s and fuel flow is 18 kg/s?

A. 3 kg/s
B. 48 kg/s
C. 53 kg/s
D. 33 kg/s
Answer» E.
Discussion
9.

The fuel flow (mf) through the gas generator is ____________ if its flow rate through the pump is 18 kg/s and through the thrust chamber is 10 kg/s.

A. 18 kg/s
B. 10 kg/s
C. 8 kg/s
D. 28 kg/s
Answer» D. 28 kg/s
Discussion
10.

The oxidiser flow (mo) through the gas generator is ____________ if its flow rate through the pump is 10 kg/s and through the thrust chamber is 5 kg/s.

A. 5 kg/s
B. 15 kg/s
C. 20 kg/s
D. 25 kg/s
Answer» B. 15 kg/s
Discussion