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Correct Answer : B
Explanation : B will have much higher specific impulse because it uses large amounts of outside air for combustion. Since specific impulse is impulse per unit amount of propellant and the stored propellant in jet engines is only the fuel (and not both fuel and oxidizer like in rocket engines), it will have a higher specific impulse.
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.
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.
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.
