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WorksheetsSpacecraft Control
Total questions: 50
Worksheet time: 50mins
Name
Class
Date
1.
Three-axis or Body Stabilization has ______________
a)
Reaction wheels
b)
Momentum wheels
c)
both (a) and (b)
d)
None of the above
2.
The box shaped satellite body is generally uses _______
a)
three-axis stabilized satellites
b)
simple Spin-stabilized
c)
dual Spin-stabilized
d)
None of the above
3.
Simplier and less expensive stabilizaiton technique is __________
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
4.
The satellite should be spun about its _______ for maximum stability.
a)
minor axis
b)
vernal equinox
c)
azimuth axis
d)
major axis
5.
The cylindrical shaped satellite body is generally uses _______
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
6.
In Spin-stabilized satellite, the body is spun at a rate between _____ about an axis perpendicular to the orbital plane
a)
3 and 10 rpm
b)
300 and 1000 rpm
c)
30 and 100 rpm
d)
3000 and 10000 rpm
7.
In dual spin satellite configuration, the _____ is placed in de-spun platform.
a)
antenna only
b)
antenna and feed
c)
payload
d)
thermal control
8.
Intelsat-4 uses which configration for stabilization?
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
9.
Intelsat-1 uses which configration for stabilization?
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
10.
Intelsat-6 uses which configration for stabilization?
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
11.
TIROS uses which configration for stabilization?
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
12.
Internation space station uses which reference co-ordinate system?
a)
Yaw
b)
Pitch
c)
Roll
d)
LVLH
13.
In three axis body stabilization, the pitch is _______
a)
To earth's center
b)
Normal to orbital plane
c)
cannot be say
d)
To sun center
14.
In three axis body stabilization, the roll is _______
a)
To earth's center
b)
Normal to orbital plane
c)
cannot be say
d)
To sun center
15.
Which will rotate only in one direction?
a)
Reaction wheels
b)
Momentum wheels
c)
gyroscope
d)
None of the above
16.
Which will rotate in both direction?
a)
Reaction wheels
b)
Momentum wheels
c)
beam
d)
None of the above
17.
Which type of stabilizatoin configuration need battery power in transfer orbit?
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
18.
Tether is used in which stabilzation configuration?
a)
three-axis stabilized satellites
b)
Spin-stabilized
c)
Gravity gradient
d)
None of the above
19.
Which subsystem ensures maintaing link with ground station?
a)
Thermal
b)
Payload
c)
Attitute Control
d)
Mechanical
20.
The gravity gradient is method is more effective in __
a)
LEO
b)
GEO
c)
HEO
d)
MEO
21.
To provide attitude control, which is essential to prevent the satellite from _________
a)
tumbling in space
b)
antennas remain pointed at a fixed point
c)
both (a) and (b)
d)
None of the above
22.
Which is best among the folowing subsystems?
a)
Mechanical
b)
payload
c)
thermal
d)
GN&C
23.
The state of satellite from the sensor is called as ____
a)
estimated state
b)
measured state
c)
both (a) and (b)
d)
None of the above
24.
What is the algorithm used in Attitute determination method?
a)
TRIAD
b)
Direction cosine method
c)
Runga kutta
d)
Newton Rapson
25.
The state of satellite from the navigation system is called as ____
a)
estimated state
b)
measured state
c)
both (a) and (b)
d)
None of the above
26.
In attitude determination method, ___________ method is used to avoid noisy measurements.
a)
least square method
b)
Kriging Interpolation
c)
Beizer
d)
spline
27.
Trajectory generator is a part of _______
a)
guidance
b)
navigation
c)
control
d)
None of the above
28.
Actuators are part of _______ system
a)
guidance
b)
navigation
c)
control
d)
None of the above
29.
The GN&C is used for
a)
Payload pointing
b)
Antenna pointing
c)
Thermal Control
d)
all the above
30.
The de-spun antenna system is used for ______
a)
pitch correction only
b)
yaw correction only
c)
roll correction only
d)
all the above
31.
Yaw and roll are controlled by _____ at appropriate intervals of time.
a)
pulsing radially mounted jets
b)
de-spun
c)
simple spin
d)
dual spin
32.
In Three axis stabilization, the ___________ is controlled
a)
the speed of the inertia wheel
b)
pulsing radially mounted jets
c)
pitch correction only
d)
roll correction only
33.
Long pole are used in low Earth and medium Earth orbits as a ______
a)
momentum wheel
b)
reaction wheel
c)
interial boom
d)
gravity gradient boom
34.
The precision with which the attitude needs to be controlled depends on the _______
a)
satellite shape
b)
satellite antenna beam width
c)
satllite mass
d)
None of the above
35.
_________ require more precise attitude control as compared to Earth coverage or regional coverage antennas
a)
Spot beams
b)
shaped beams
c)
both (a) and (b)
d)
None of the above
36.
Thruster is a ______
a)
guidance system
b)
navigation system
c)
actuator
d)
None of the above
37.
Electromagnetic Torque Rod is a ___
a)
guidance system
b)
navigation system
c)
actuator
d)
None of the above
38.
Reaction wheels are ______
a)
guidance system
b)
navigation system
c)
actuator
d)
None of the above
39.
Control-Moment Gyros is a _______
a)
guidance system
b)
navigation system
c)
actuator
d)
None of the above
40.
Gravity gradient boom is ______ control device
a)
active
b)
passive
c)
dual
d)
None of the above
41.
Aerobrakes are _________ Attitute Orbit Control System.
a)
active
b)
passive
c)
dual
d)
None of the above
42.
Thrusters are _________ Attitute Orbit Control System.
a)
active
b)
passive
c)
dual
d)
None of the above
43.
Electromagnetic Torque Rods are _________ Attitute Orbit Control System.
a)
active
b)
passive
c)
dual
d)
None of the above
44.
Reaction wheels are _________ Attitute Orbit Control System.
a)
active
b)
passive
c)
dual
d)
None of the above
45.
Control-Moment Gyros are _________ Attitute Orbit Control System.
a)
active
b)
passive
c)
dual
d)
None of the above
46.
Gravity gravitational boom dampens the oscillations using the _______
a)
difference in the gravitational field between the top and the bottom of the pole
b)
difference in the gravitational field between the left and the right of the pole
c)
both (a) and (b)
d)
None of the above
47.
The feedback system is absent in ______ Attitude control systems
a)
active
b)
passive
c)
dual
d)
None of the above
48.
Active control maintains the satellite attitude by sensing its orientation along the _____
a)
pitch only
b)
yaw only
c)
roll only
d)
all the three axes
49.
In GN&C, Sending commands without real-time visibility into their effect is called as ______
a)
open loop control
b)
closed loop control
c)
gain
d)
bandwidth
50.
In GN&C, commanding that adjusts in real-time based on its measured effectiveness is called as ______
a)
open loop control
b)
closed loop control
c)
gain
d)
bandwidth
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