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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Tests  >  Sensor & Industrial Instrumentation  >  Test: Measurements of Vibrations - Electronics and Communication Engineering (ECE) MCQ

Test: Measurements of Vibrations - Electronics and Communication Engineering (ECE) MCQ


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15 Questions MCQ Test Sensor & Industrial Instrumentation - Test: Measurements of Vibrations

Test: Measurements of Vibrations for Electronics and Communication Engineering (ECE) 2024 is part of Sensor & Industrial Instrumentation preparation. The Test: Measurements of Vibrations questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Measurements of Vibrations 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: Measurements of Vibrations below.
Solutions of Test: Measurements of Vibrations questions in English are available as part of our Sensor & Industrial Instrumentation for Electronics and Communication Engineering (ECE) & Test: Measurements of Vibrations solutions in Hindi for Sensor & Industrial Instrumentation course. Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free. Attempt Test: Measurements of Vibrations | 15 questions in 20 minutes | Mock test for Electronics and Communication Engineering (ECE) preparation | Free important questions MCQ to study Sensor & Industrial Instrumentation for Electronics and Communication Engineering (ECE) Exam | Download free PDF with solutions
Test: Measurements of Vibrations - Question 1
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When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Detailed Solution for Test: Measurements of Vibrations - Question 1
When no external force acts on the body, after giving it an initial displacement, then the body is said to be under free or natural vibrations. The frequency of the free vibrations is called free or natural frequency. When there is a reduction in amplitude over every cycle of vibration, the motion is said to be damped vibration.
Test: Measurements of Vibrations - Question 2
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Longitudinal vibrations are said to occur when the particles of a body move

Detailed Solution for Test: Measurements of Vibrations - Question 2

  • When the particles of the shaft or disc move parallel to the axis of the shaft, then the vibrations are known as longitudinal vibrations.

  • When the particles of the shaft or disc move approximately perpendicular to the axis of the shaft, then the vibrations are known as transverse vibrations.

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Test: Measurements of Vibrations - Question 3
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When a body is subjected to transverse vibrations, the stress-induced in a body will be

Detailed Solution for Test: Measurements of Vibrations - Question 3
In transverse vibrations, the shaft is straight and bent alternately and bending stresses are induced in the shaft.
Test: Measurements of Vibrations - Question 4
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The natural frequency (in Hz) of free longitudinal vibrations is equal to
Detailed Solution for Test: Measurements of Vibrations - Question 4
Natural Frequency, fn = 0.4985/δ

where m = Mass of the body in kg,

s = Stiffness of the body in N/m, and

δ = Static deflection of the body in metres.

Test: Measurements of Vibrations - Question 5
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The factor which affects the critical speed of a shaft is
Detailed Solution for Test: Measurements of Vibrations - Question 5
To determine the critical speed of a shaft that may be subjected to point loads, uniformly distributed load, or a combination of both, we find the frequency of transverse vibration which is equal to the critical speed of a shaft in r.p.s. Dunkerley’s method may be used for calculating the frequency.
Test: Measurements of Vibrations - Question 6
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The equation of motion for a vibrating system with viscous damping is

d2x / dt2 + c/m X dx / dt + s/m X x = 0

If the roots of this equation are real, then the system will be
Detailed Solution for Test: Measurements of Vibrations - Question 6

  • When the roots are real, overdamping takes place.

  • When the roots are complex conjugate under-damping takes place.

Test: Measurements of Vibrations - Question 7
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In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
Detailed Solution for Test: Measurements of Vibrations - Question 7
log (x1 / x2)
Test: Measurements of Vibrations - Question 8
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The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
Detailed Solution for Test: Measurements of Vibrations - Question 8

  • Magnificent Factor is the ratio of maximum displacement of the forced vibration (xmax) to the deflection due to the static force F(xo).

  • Damping Factor is the ratio of damping coefficient for the actual system, and damping coefficient for the critically damped system.

Test: Measurements of Vibrations - Question 9
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In vibration isolation system, if ω/ωn is less than √2, then for all values of the damping factor, the transmissibility will be

where ω = Circular frequency of the system in rad/s, and ωn = Natural circular frequency of vibration of the system in rad/s.
Detailed Solution for Test: Measurements of Vibrations - Question 9
The value of ω / ωn must be greater than √2 if ε is to be less than 1 and it is the numerical value of ε, independent of any phase difference between the forces that may exist which is important.
Test: Measurements of Vibrations - Question 10
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In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is
Detailed Solution for Test: Measurements of Vibrations - Question 10
There is a phase difference of 180° between the transmitted force and the disturbing force.
Test: Measurements of Vibrations - Question 11
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Temperature monitoring technique uses which of the following devices to measure temperature of the machining surfaces?
Detailed Solution for Test: Measurements of Vibrations - Question 11

  • A pyrometer is a type of remote-sensing thermometer used to measure the temperature of distant objects.

  • A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction.

  • Thermometer is a device to measure temperature

Test: Measurements of Vibrations - Question 12
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Which of the following statements is true about stroboscope?
Detailed Solution for Test: Measurements of Vibrations - Question 12
A stroboscope, also known as strobe, is an instrument used to make a cyclically moving object appear to be slow-moving or stationary. The principle is used for the study of rotating, reciprocating, oscillating or vibrating objects. Machine parts and vibrating strings are common examples.
Test: Measurements of Vibrations - Question 13
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Which type of frequency measuring instrument has multiple reeds of different natural frequency to measure vibrations?
Detailed Solution for Test: Measurements of Vibrations - Question 13
Frahm tachometers are particularly useful to measure the speeds of engines whose rotating shafts are not easily accessible. Design a compact and lightweight Frahm tachometer with 12 reeds to measure engine speeds in the range 300-600 rpm.
Test: Measurements of Vibrations - Question 14
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Which type of instruments do not require separate power source for measuring vibratory response of a vibratory system?
Detailed Solution for Test: Measurements of Vibrations - Question 14
Instruments are divided into active or passive ones according to whether the instrument output is entirely produced by the quantity being measured or whether the quantity being measured simply modulates the magnitude
Test: Measurements of Vibrations - Question 15
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Which of the following instruments measure amplitude of a vibrating body?
Detailed Solution for Test: Measurements of Vibrations - Question 15

  • Vibration meter or analyzer is an electronic device that is able to process vibration signals. The sensor is generating a Voltage signal while it is shaking on the machine. This voltage signal is transferred through the cable to your vibration device. But your vibration device will not show you volts.

  • A seismometer is a device that is sensitive to vibrations. It works on the principle of a pendulum: a heavy, inert mass with a certain resistance to movement (i.e. inertia) due to its weight is suspended from a frame by a spring that allows movement.

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