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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Tests  >  Sensor & Industrial Instrumentation  >  Test: Accelerometer- 1 - Electronics and Communication Engineering (ECE) MCQ

Test: Accelerometer- 1 - Electronics and Communication Engineering (ECE) MCQ


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25 Questions MCQ Test Sensor & Industrial Instrumentation - Test: Accelerometer- 1

Test: Accelerometer- 1 for Electronics and Communication Engineering (ECE) 2024 is part of Sensor & Industrial Instrumentation preparation. The Test: Accelerometer- 1 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Accelerometer- 1 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Accelerometer- 1 below.
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Test: Accelerometer- 1 - Question 1
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What does the accelerometer measure?

Detailed Solution for Test: Accelerometer- 1 - Question 1
The accelerometer is a type of inertial instrument that measures the acceleration in any given axes. The measured acceleration can be integrated over time to obtain velocity and distance.
Test: Accelerometer- 1 - Question 2
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What is the output given by an accelerometer if the instrument is accelerated upward with an acceleration of 7g?

Detailed Solution for Test: Accelerometer- 1 - Question 2
Accelerometer is used to measure acceleration of the vehicle and thus must be corrected for the Earth’s gravitational effect. If the accelerometer is being accelerated upward with an acceleration of 7g, then (a-G) = 7g – (-1g), and the instrument reads 8g.
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Test: Accelerometer- 1 - Question 3
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Which accelerometer uses torque coil and pick off supported by a flexure to measure acceleration?

Detailed Solution for Test: Accelerometer- 1 - Question 3
The flexure pivot accelerometer is the most commonly used in aircraft systems. The sensitive element consists of a pendulum with a torque coil and a pick-off supported by torsional spring or flexure.
Test: Accelerometer- 1 - Question 4
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In flexure pivot accelerometer, the torque current is a measure of acceleration.
Detailed Solution for Test: Accelerometer- 1 - Question 4
The torque coil in the accelerometer restores the pendulum to null, the torque current being a measure of the restoring torque and, hence, of the acceleration.
Test: Accelerometer- 1 - Question 5
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Which type of rebalancing technique use voltage applied to the pendulum and electrode for correction?
Detailed Solution for Test: Accelerometer- 1 - Question 5
In potential forcing, a potential is applied to the pendulum and to one or both the electrodes. The voltage establishes electric fields that induce the charge of the nonconducting pendulum. This causes a net force to act on the proof mass.
Test: Accelerometer- 1 - Question 6
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Why do accelerometers that include fluid damping exhibit reduced damping?
Detailed Solution for Test: Accelerometer- 1 - Question 6
Accelerometers that include fluid damping exhibit reduced bandwidth and additional thermal sensitivity due to changes in fluid characteristics. Thus flexure pivoted accelerometers are better than floated instruments.
Test: Accelerometer- 1 - Question 7
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An accelerometer can only measure acceleration in one direction?
Detailed Solution for Test: Accelerometer- 1 - Question 7
An accelerometer can only measure acceleration in one axes. In navigational systems comprising of accelerometers, three separate accelerometers are places with each on the three-body axes of the aircraft.
Test: Accelerometer- 1 - Question 8
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Which of the following is true with respect to flexure pivot accelerometers?
Detailed Solution for Test: Accelerometer- 1 - Question 8
The pivot or flexure supporting the pendulum must provide minimal restraint for the pendulum in the direction of the input axis while exhibiting high stiffness in the other two directions. The spring constant of the flexure or pivot generates a restoring force that reduces the gain of the electronic restoring loop.
Test: Accelerometer- 1 - Question 9
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Which of the following conditions cause rectification of vibration inputs?
Detailed Solution for Test: Accelerometer- 1 - Question 9
Heating of torque coil due to rebalancing current can lead to rectification of vibration inputs and must often be compensated. A pulse rebalances torque maintains constant heating.
Test: Accelerometer- 1 - Question 10
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What do silicon accelerometers use for proof mass sensing and for rebalancing?
Detailed Solution for Test: Accelerometer- 1 - Question 10
The frame, proof mass, and hinges are made with single crystal silicon. Metalised wafers are used to enclose this and also serve as electrodes for sensing proof mass and rebalancing.
Test: Accelerometer- 1 - Question 11
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Which axis accelerometer is mostly used in IoT?
Detailed Solution for Test: Accelerometer- 1 - Question 11
It uses a 3-axis accelerometer. It detects orientation, shakes, tap, double-tap, fall, tilt, motion, positioning, shock, or vibration.
Test: Accelerometer- 1 - Question 12
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Accelerometer is the measurement of ________.
Detailed Solution for Test: Accelerometer- 1 - Question 12
Accelerometer is the measurement of the change in velocity or speed divided by time. For example, a car accelerating from a standstill to 60mph in 60 seconds is determined to have an acceleration of 10mph per second(60/6).
Test: Accelerometer- 1 - Question 13
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What is the use of accelerometers in laptops?
Detailed Solution for Test: Accelerometer- 1 - Question 13
Accelerometers in laptops protect hard drives from damage. If the laptop were to suddenly drop while in use, the accelerometer would detect the sudden free fall and immediately turn off the hard drive to avoid hitting the reading heads into the hard drive platter.
Test: Accelerometer- 1 - Question 14
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Are accelerometers used in cars?
Detailed Solution for Test: Accelerometer- 1 - Question 14
Accelerometers are likewise used in cars as the industry method way of detecting car crashes and deploying airbags almost instantaneously.
Test: Accelerometer- 1 - Question 15
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How many and what are the parts that are present in the accelerometer sensor?
Detailed Solution for Test: Accelerometer- 1 - Question 15
The accelerometer consists of many different parts and works in many ways, two of which are the piezoelectric effect and the capacitor sensor. The piezoelectric effect is the most common form of accelerometer and uses microscopic crystal structures that become stressed due to accelerative forces. The capacitance accelerometer senses changes in capacitance between microstructures located next to the device.
Test: Accelerometer- 1 - Question 16
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DC (Direct Current) response accelerometer cannot measure dynamic acceleration.
Detailed Solution for Test: Accelerometer- 1 - Question 16
DC (Direct Current) response accelerometer can measure dynamic acceleration as well as static acceleration such as acceleration due to gravity. However, AC (Alternating Current) response accelerometer cannot measure constant or static acceleration. They are designed to determine dynamic accelerations and events which change regularly.
Test: Accelerometer- 1 - Question 17
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What will be the value measured by an accelerometer in free fall?
Detailed Solution for Test: Accelerometer- 1 - Question 17
In a free fall the accelerometer will measure value=0. In a stationary state, the accelerometer will measure the acceleration due to gravity as 9.81 m/s2 but in a free fall the acceleration of the falling accelerometer is also 9.81 m/s2 in the same direction, therefore the relative acceleration of the accelerometer becomes zero.
Test: Accelerometer- 1 - Question 18
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Which is the name of the accelerometer that is used to measure the gravity of the earth?
Detailed Solution for Test: Accelerometer- 1 - Question 18
A gravimeter is the accelerometer that is used to measure the gravity of the earth. The gravity of the earth varies from place to place depending upon the type of plain, plateau, etc. This determination of acceleration due to gravity is called gravimetry.
Test: Accelerometer- 1 - Question 19
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What is the exact value of acceleration due to gravity taken in consideration?
Detailed Solution for Test: Accelerometer- 1 - Question 19
The exact standard acceleration due to gravity is taken as 9.80665 m/s2. For general calculations, it is assumed to be 10 m/s2. It the acceleration in which the earth pulls all the objects present on the surface of the earth. This acceleration varies at the poles of the earth.
Test: Accelerometer- 1 - Question 20
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Which element is mostly used in the capacitive accelerometers for sensing?
Detailed Solution for Test: Accelerometer- 1 - Question 20
Silicon is mostly used in capacitive accelerometers for sensing. It is relatively cheap and exhibits far better performance in the low-frequency range. They can provide higher stability and linearity when operated in servo mode.
Test: Accelerometer- 1 - Question 21
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MEMS stands for ________.
Detailed Solution for Test: Accelerometer- 1 - Question 21
MEMS stands for Micro electromechanical system. Accelerometers, Gyroscopes, and pressure sensors are MEMS sensors. It is a technology using which most of the accelerometers and other sensors are designed.
Test: Accelerometer- 1 - Question 22
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Accelerometers can be used for sensing mechanical vibrations.
Detailed Solution for Test: Accelerometer- 1 - Question 22
Accelerometers can be used for sensing mechanical vibrations. They can detect even very precise vibrations in the machine. Since the vibration is in a single plane a two-axis accelerometer is best suited for the measurement.
Test: Accelerometer- 1 - Question 23
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Acceleration is a ______ quantity.
Detailed Solution for Test: Accelerometer- 1 - Question 23
Acceleration is a vector quantity. It is a vector quantity because it depends on both, the magnitude of acceleration as well as the direction of acceleration. Had it been only dependent on magnitude, it would be a scalar quantity but it is not so.
Test: Accelerometer- 1 - Question 24
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MPU6050 is an example of which type of sensor?
Detailed Solution for Test: Accelerometer- 1 - Question 24
MPU6050 is an example of an acceleration sensor. It consists of both 3 axis accelerometer and 3 axis gyroscope, which is capable of measuring very precise movements and accelerations.
Test: Accelerometer- 1 - Question 25
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Piezoelectric accelerometers converts ________ energy to ______energy.
Detailed Solution for Test: Accelerometer- 1 - Question 25
Piezoelectric accelerometers convert mechanical energy to electrical energy. The word piezoelectric is derived from the Greek word “piezein” which means to press or squeeze. When any mechanical variable such as force or shock is applied to the input, then it produces subsequent electrical signals which are used to measure its magnitude.
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