Strap Down and Gimballed Inertial Navigation Systems MCQ

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• In any order of gimbal, the innermost gimbal has unlimited freedom.
  ক

  True

  খ

  False
• Which of the following factors affect the ability of a stable element to remain non-rotating relative to space?
  ক

  Drift rate of the reference gyro

  খ

  Accuracy of gyro torquer

  গ

  Linear motion of the vehicle

  ঘ

  Orthogonality of the components on the platform
• When does a gimbal lock occur on a three axis platform?
  ক

  Inner gimbal approaches 90°

  খ

  Inner gimbal approaches 0°

  গ

  Outer gimbal approaches 90°

  ঘ

  Middle gimbal approaches 90°
• Which of the following is false with respect to gimballed platform?
  ক

  Orients the accelerometers into a coordinate frame relative to Earth

  খ

  Euler angles are not easily readable from the gimbals

  গ

  Protect the instruments from large angular motion

  ঘ

  Protection from vibration, temperature and magnetic effects.
• Sculling errors occur when rotation and acceleration are combined.
  ক

  True

  খ

  False
• Why is the gyro and accelerometers shock mounted to the body?
  ক

  Impact protection

  খ

  Reduce drift error

  গ

  Prevent voltage surges

  ঘ

  Limit vibration errors
• Pre-processing algorithms are also called as _________
  ক

  Coning algorithm

  খ

  Error control algorithm

  গ

  Differential algorithm

  ঘ

  Resolution algorithm
• What type of error occurs if the axis of rotation is moving in space?
  ক

  Linearization errors

  খ

  Control error

  গ

  Coning error

  ঘ

  Differential error
• What does the quaternion integration algorithm use to control error?
  ক

  Linearization constraint

  খ

  Normalization constraint

  গ

  Differential constraint

  ঘ

  Integral constraints
• Which of the following is a four element entity consisting of a scalar and a vector and is used to describe strapdown system rotation?
  ক

  Directional cosines

  খ

  Directional sines

  গ

  Quaternion

  ঘ

  Triternion
• Which one of the following is not a purpose of strapdown calculations?
  ক

  Calculate vehicle’s attitude

  খ

  Transform accelerometer measurements into navigational coordinates

  গ

  Perform dead-reckoning computations

  ঘ

  Provide inputs to air data computer
• What the gyro act as in a strapdown system?
  ক

  Angular rate sensors

  খ

  Null sensors

  গ

  Angle indicators

  ঘ

  Orientation indicators
• In which type of inertial navigation system are the gyro and accelerometer rigidly mounted to the body?
  ক

  Gimballed system

  খ

  Fixed system

  গ

  Strapdown system

  ঘ

  Void system