# Interplanetary Trajectories Questions and Answers – Two Impulse Rendezvous Maneuvers

This set of Spaceflight Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Two Impulse Rendezvous Maneuvers”.

1. Which of these maneuvers is the most energy efficient while transferring a spacecraft from one planet to another?
a) Hohmann transfer
b) Bi-elliptic transfer
c) Phasing maneuver
d) One-tangent maneuver

Explanation: During interplanetary trajectory involving spacecraft to move from one planet to another, Hohmann transfer is the most energy efficient transfer. The departure from the first planet is at the periapsis and the arrival is at the apoasis of the second planet’s orbit.

2. While carrying out interplanetary mission by moving spacecraft from outer planet to the inner planet, what is the value of the delta-v?
a) Positive
b) Negative
c) Zero
d) Infiinity

Explanation: The delta-v required to move the spacecraft from the outer planet to the inner planet is always negative because departure point is at the aphelion and the arrival point is at the perihelion. The speed of the spacecraft has to be reduced in otder to enter a lower- energy transfer orbit.

3. Phasing maneuvers are considered to be of preference when carrying out interplanetary rendezvous.
a) True
b) False

Explanation: Interplanetary rendezvois is required when a spacecraft has to intercept another planet. In this case, phasing maneuvers are not considered to be practical as it has a very large time period for heliocentric orbits

4. How is angular velocity of the two planets related if orbit of planet 1 lies inside orbit of planet 2?
a) n1 = n2
b) n1 > n2
c) n1 < n2
d) n1 = 2n2

Explanation: When the orbit of planet 1 lies inside the orbit of planet 2, the orbital angular velocity n1 is greater than n2. That is the planet 2 moves clockwise in the orbit relative to the planet 1 in the orbit.

Sanfoundry Global Education & Learning Series – Spaceflight Mechanics.

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