Rocket Propulsion Questions and Answers – Liquid Propellant Rocket Engine – Flow and Pressure Balance

This set of Rocket Propulsion MCQs focuses on “Liquid Propellant Rocket Engine – Flow and Pressure Balance”.

1. The oxidiser flow (m_o) 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
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2. The fuel flow (m_f) 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
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3. 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
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4. In a turbopump, what are are the gear ratios for a_o and a_f (for oxidizer pump and fuel pump respectively) if no gears are used?
a) 0 for both
b) 1 for both
c) 0 for a_o and 1 for a_f
d) 0 for a_f and 1 for a_o
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5. If the gear ratio for fuel pump is thrice that of the oxidizer pump, the sha_ft speed of fuel pump is ____________ the oxidizer pump.
a) half
b) twice
c) thrice
d) one-third
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6. If power of turbines equals P_T, power consumed by pumps is P_P and the power consumed by auxiliaries is P_A, what is the expression for auxiliary power?
a) P_A = P_P – P_T
b) P_A = P_P + P_T
c) P_A = P_T – P_P
d) P_A = P_T x P_P
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7. 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
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8. Which of the following expressions is true when there are no gears in a particular turbopump?
a) N_T = N_o ≠ N_f
b) N_T ≠ N_o = N_f
c) N_T ≠ N_o ≠ N_f
d) N_T = N_o = N_f
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9. 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_T = L_o + L_f + L_b
b) L_T = L_o x L_f x L_b
c) L_T = L_o = L_f = L_b
d) L_T = L_o = L_f ≠ L_b
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10. If the pressure rise ΔP across a pump is half the discharge pressure, then which of the following relates the suction pressure P_s to discharge pressure p_d?
a) P_s = p_d
b) P_s = 2 x P_d
c) 2 x P_s = P_d
d) P_s = 4 x P_d
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Sanfoundry Global Education & Learning Series – Rocket Propulsion.

To practice all areas of Rocket Propulsion, here is complete set of 1000+ Multiple Choice Questions and Answers.

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