Dynamics of Machinery Test Questions | Set 3

MCQs 1: Which among the following is not considered when reference standards are used in the field of mechanical vibration and shock, monitoring and analysis of machines?

Terminology

Methods of testing

Methods of measurement

None of the above

Answer Explanation

MCQs 2: The noise level generated by domestic air conditioner ranges between _________

38 dB to 70 dB

35 dB to 52 dB

62 dB to 88 dB

50 dB to 60 dB

Answer Explanation

MCQs 3: Which of the following construction equipments have highest noise level?

Compressors

Generators

Pneumatic wrenches

Pumps

Answer Explanation

MCQs 4: Which type of earplugs contain silicon rubber and a fixing agent?

Semi insert protectors

Custom moulded earplugs

Pre-fabricated earplugs

Canal caps

Answer Explanation

MCQs 5: Which of the following absorptive treatment can be used to cover the interior of a box to prevent the reverberant sound?

Open cell foam

Glass fiber mat

Both a. and b.

None of the above

Answer Explanation

MCQs 6: What is meant by Reverberant chamber?

Chambers having walls, ceiling and flooring acoustically reflected

Chambers having walls, ceiling and flooring covered by sound absorbing materials

Chambers having walls and ceiling made of different absorbing material

None of the above

Answer Explanation

MCQs 7: Determine velocity of sound in air at 50o. (For air, γ = 1.4)

1002.5 m/s

360.45 m/s

350 m/s

None of the above

Answer Explanation

MCQs 8: Sound wave has a frequency of 8 kHz at 22o C. Determine its wavelength.

0.043 m

0.039 m

0.125 m

0.0125 m

Answer Explanation

MCQs 9: What will be the sound power level, if a machine generates 20 W power?

124 dB

133 dB

150 dB

200 dB

Answer Explanation

MCQs 10: Secondary force in reciprocating engine mechanism is caused due to _______

S.H.M. of reciprocating parts

oscillation of reciprocating parts

obliquity of arrangement of reciprocating parts

all of the above

Answer Explanation

MCQs 1: Which among the following is not considered when reference standards are used in the field of mechanical vibration and shock, monitoring and analysis of machines?

MCQs 2: The noise level generated by domestic air conditioner ranges between _________

MCQs 3: Which of the following construction equipments have highest noise level?

MCQs 4: Which type of earplugs contain silicon rubber and a fixing agent?

MCQs 5: Which of the following absorptive treatment can be used to cover the interior of a box to prevent the reverberant sound?

MCQs 6: What is meant by Reverberant chamber?

MCQs 7: Determine velocity of sound in air at 50o. (For air, γ = 1.4)

MCQs 8: Sound wave has a frequency of 8 kHz at 22o C. Determine its wavelength.

MCQs 9: What will be the sound power level, if a machine generates 20 W power?

MCQs 10: Secondary force in reciprocating engine mechanism is caused due to _______

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