For a constant thrust of 6000 N, find the total impulse for the burning time of 3s.

0 Ns

9000 Ns

18000 Ns

36000 Ns

Correct Answer : 18000 Ns

Explanation : Here we assume that the start and stop transients are negligible during the operation of the system. Then, for a constant thrust (F), and for the total burning time of t seconds, the total impulse I_t = Ft.
I_t = 6000 x 3 = 18000 Ns

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In which of the propulsion systems is the maximum temperature achieved?

Nuclear

Chemical

Arc heating

Solar heating

Correct Answer : Option (C) : Arc heating

Explanation : Arc heating can lead to temperatures of about 20,000 deg C. Chemical propulsion systems have a maximum temperature ranging from 2500-4100 deg C, while nuclear fission leads to temperatures of about 2700 deg C.

What is the propulsion duration of resistojets?

Few weeks

Few days

Few minutes

Few seconds

Correct Answer : Option (B) : Few days

Explanation : Resistojets have a propulsion duration spanning a few days. The chemical rocket engines have a propulsion duration lasting a few seconds to a few minutes, while for ion-electrostatic engines, it lasts for months.

Which of the following engines can achieve the maximum specific impulse of 5000 s?

Hall effect

Ion-electrostatic

Solar heating

Nuclear fission

Correct Answer : Option (B) : Ion-electrostatic

Explanation : Ion-electrostatic engine has a specific impulse of 1200-5000 s. Nuclear fission type engines have Isp of 500-860 s, while solar heating engines have it around 400-700 s.