Which of the following is not true about chemical rockets?
a) Relatively low values of specific impulse
b) Relatively light machinery
c) Very high thrust capability
d) Very low specific power
Q.2.
Which of the following vehicles is used where the flight time is long?
a) Electrical propulsion unit
b) Solid propulsion system
c) Liquid propulsion system
d) Hybrid propulsion system
Q.3.
What is a sensible specific impulse value for a nuclear fission type rocket engine among the given options?
a) 300 s
b) 600 s
c) 800 s
d) 2000 s
Q.4.
What is the typical order of magnitude of mass flow rate (in kg/s) for a chemical rocket engine?
a) 10
b) 0.1
c) 0.01
d) 1
Q.5.
Which of the following engines can achieve the maximum specific impulse ofs?
a) Ion-electrostatic
b) Nuclear fission
c) Hall effect
d) Solar heating
Q.6.
What is the propulsion duration of resistojets?
a) Few seconds
b) Few minutes
c) Few days
d) Few weeks
Q.7.
In which of the propulsion systems is the maximum temperature achieved?
a) Chemical
b) Nuclear
c) Arc heating
d) Solar heating
Q.8.
Which of the following types of engines use Xe as a typical working fluid?
a) Resistojets
b) Electro thermal
c) Hall effect
d) Nuclear fission
Q.9.
Which of the following can typically achieve maximum effective exhaust velocity?
a) Electrostatic and electromagnetic
b) Arcjet
c) Solar heated H2
d) Nuclear fission
Q.10.
A rocket engine moving atm/s produces a total thrust ofN, consuming propellants at the rate of 4.kg/s. The energy content of the propellants is 5.MJ/kg. Find the effective exhaust velocity.
a) 2100 m/s
b) 3936 m/s
c) 1555 m/s
d) 1400 m/s
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