Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 68 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

What is meant by coupled differential equation?
A. The differential equation in which only rectilinear motions exit
B. The differential equation in which only angular motions exit
C. The differential equation in which both rectilinear and angular motions exit
D. None of the above
Answer» D. None of the above
Discussion
2.

Determine magnitude of balancing mass required if 250 mm is the radius of rotation. Masses of A, B and C are 300 kg, 250 kg and 100 kg which have radii of rotation as 50 mm, 80 mm and 100 mm respectively . The angles between the consecutive masses are 110° and 270° respectively.
A. 45.36 kg
B. 47.98 kg
C. 40.50 kg
D. None of the above
Answer» C. 40.50 kg
Discussion
3.

What is the function of frequency analyzer?
A. It analysis noise signal in frequency domain into various frequency bands by magnetically separating the signal
B. It analysis noise signal in frequency domain into various frequency bands by electronically separating the signal
C. It analysis noise signal in frequency domain into various frequency bands by electromagnetically separating the signal
D. None of the above
Answer» C. It analysis noise signal in frequency domain into various frequency bands by electromagnetically separating the signal
Discussion
4.

At which angle primary unbalanced force in reciprocating engine mechanism is maximum?
A. 0°
B. 90°
C. 360°
D. All of the above
Answer» B. 90°
Discussion
5.

Which of the following conditions should be satisfied for static balancing? 1. Dynamic forces acting on the system should be zero 2. Couple acting on the system due to dynamic force should be zero 3. Centrifugal forces acting on the system should be zero 4. Couple acting on the system due to centrifugal forces should be zero
A. Condition 1 and condition 2
B. Condition 1 and condition 3
C. Condition 3 and condition 4
D. All of the above
Answer» C. Condition 3 and condition 4
Discussion
6.

What are deterministic vibrations?
A. Vibrations caused due to known exciting force
B. Vibrations caused due to unknown exciting force
C. Vibrations which are aperiodic in nature
D. None of the above
Answer» B. Vibrations caused due to unknown exciting force
Discussion
7.

Which of the following factors are not responsible for unbalancing in rotating systems?
A. Errors
B. Tolerances
C. Shape of the rotor
D. None of the above
Answer» E.
Discussion
8.

In which type of vibrations, amplitude of vibration goes on decreasing every cycle?
A. Damped vibrations
B. Undamped vibrations
C. Both a. and b.
D. None of the above
Answer» B. Undamped vibrations
Discussion
9.

Which of the following vibrations are classified according to magnitude of actuating force?
A. Torsional vibrations
B. Deterministic vibrations
C. Transverse vibrations
D. All of the above
Answer» C. Transverse vibrations
Discussion
10.

According to which method, maximum kinetic energy at mean position is equal to maximum potential energy at extreme position?
A. Energy method
B. Rayleigh's method
C. Equilibrium method
D. All of the above
Answer» C. Equilibrium method
Discussion
11.

What are discrete parameter systems?
A. Systems which have infinite number of degree of freedom
B. Systems which have finite number of degree of freedom
C. Systems which have no degree of freedom
D. None of the above
Answer» C. Systems which have no degree of freedom
Discussion
12.

Transmissibility is the ratio of ______
A. force transmitted to the supporting structure and force impressed upon the system
B. displacement amplitude of mass and displacement amplitude of supporting structure
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
13.

Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg?
A. 12.32 Hz
B. 4.10 Hz
C. 6.16 Hz
D. None of the above
Answer» D. None of the above
Discussion
14.

Which type of instruments do not require separate power source for measuring vibratory response of a vibratory system?
A. Active instruments
B. Passive instruments
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
15.

Which type of frequency measuring instrument has multiple reeds of different natural frequency to measure vibrations?
A. Fullarton tachometer
B. Frahm Tachometer
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
16.

Which of the following methods can be used to control the noise level at source?
A. Changing design process
B. Using sound enclosures
C. Controlling vibration
D. All of the above
Answer» E.
Discussion
17.

Which of the following statements is true about stroboscope?
A. Stroboscope is non-contact type frequency instrument
B. Stroboscope can measure frequency upto 5 Hz
C. Stroboscope uses electromagnetic radiations to measure frequency
D. All of the above
Answer» B. Stroboscope can measure frequency upto 5 Hz
Discussion
18.

What is the function of the controller in active vibration isolation systems?
A. Detect vibrations to be controlled
B. Reposition the masses
C. Interpret detected vibrations and execute commands
D. All of the above
Answer» D. All of the above
Discussion
19.

Temperature monitoring technique uses which of the following devices to measure temperature of the machining surfaces?
A. Pyrometers
B. Thermocouples
C. Thermometers
D. All of the above
Answer» E.
Discussion
20.

Which of the following statements is/are true? 1. Magnification factor is minimum at resonance 2. The maximum value of amplification factor increases as damping factor decreases 3. The maximum value of amplification factor increases as damping factor increases 4. Magnification factor is maximum at resonance
A. Statement 1 and statement 2
B. Statements 1,2 and 3
C. Statement 2 and statement 4
D. All the above statements are true
Answer» D. All the above statements are true
Discussion
21.

Eddy current damping is an example of _____
A. Coulomb damping
B. Hysteresis damping
C. Viscous damping
D. Dry friction damping
Answer» D. Dry friction damping
Discussion
22.

Which of the following statements is/are true for elastomers?
A. Elastomers can be used for static deflections up to 12 mm
B. Elastomers can provide natural frequencies below 5 Hz
C. Elastomers have good performance at high frequencies
D. All the above statements are true
Answer» E.
Discussion
23.

Which of the following statements is/are false for pneumatic isolators ? 1. Pneumatic isolators are used when driving frequencies below 10 Hz are present 2. Nausea is caused due to noise at low frequencies 3. At high natural frequencies, isolators can obtain efficiency of 90% 4. Pneumatic isolators have limited load carrying capacity
A. Only statement 1
B. Only statement 3
C. Only statement 2, 4
D. All the above statements are false
Answer» C. Only statement 2, 4
Discussion
24.

Which of the following statements is/are true primary/secondary couple? 1. Secondary couple does not act on V engine 2. Primary couple acts on V engine 3. Secondary couple acts on reciprocating masses of multi-cylinder inline engines 4. Primary couple acts on reciprocating masses of multi-cylinder inline engines
A. 1 and 2
B. 2, 3 and 4
C. 1, 3 and 4
D. All of the above
Answer» D. All of the above
Discussion
25.

Which of the following conditions should be satisfied for complete balancing of multi-cylinder inline engines?

A. Primary couples should be balanced
B. Secondary couples should be balanced
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
26.

Which type of vibrations are also known as transient vibrations?
A. Undamped vibrations
B. Damped vibrations
C. Torsional vibrations
D. Transverse vibrations
Answer» C. Torsional vibrations
Discussion
27.

During transverse vibrations, shaft is subjected to which type of stresses?
A. Tensile stresses
B. Torsional shear stress
C. Bending stresses
D. All of the above
Answer» D. All of the above
Discussion
28.

Which of the following relations is true for viscous damping?
A. Force α relative displacement
B. Force α relative velocity
C. Force α (1 / relative velocity)
D. None of the above
Answer» C. Force α (1 / relative velocity)
Discussion
29.

In damped free vibrations, which parameters indicate vibrations?
A. Natural frequency
B. Rate of decay of amplitude
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
30.

What is the effect of damping on phase angle at resonance frequency?
A. Phase angle increases as damping increases
B. Damping has no effect on phase angle
C. Phase angle increases as damping decreases
D. None of the above
Answer» C. Phase angle increases as damping decreases
Discussion
31.

Two springs have spring stiffness of 1500 N/m and 2000 N/m respectively. If they are connected in series, what is the spring stiffness if they are replaced by an equivalent system.3500 N/m
A. 3500 N/m
B. 1166 N/m
C. 857.63 N/m
D. None of the above
Answer» D. None of the above
Discussion
32.

Calculate natural frequency of damped vibration, if damping factor is 0.52 and natural frequency of the system is 30 rad/sec which consists of machine supported on springs and dashpots.
A. 25.62 rad/sec
B. 20.78 rad/sec
C. 14.4 rad/sec
D. 15.33 rad/sec
Answer» B. 20.78 rad/sec
Discussion
33.

What is meant by critical damping coefficient?
A. Frequency of damped free vibrations is less than zero
B. The motion is aperiodic in nature
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
34.

At which frequency ratio, phase angle increases as damping factor increases?
A. When frequency ratio is less than unity
B. When frequency ratio is more than unity
C. When frequency ratio is zero
D. All of the above
Answer» B. When frequency ratio is more than unity
Discussion
35.

Calculate damped natural frequency, if a spring mass damper system is subjected to periodic disturbing force of 30 N. Damping coefficient is equal to 0.76 times of critical damping coefficient and undamped natural frequency is 5 rad/sec
A. 3.99 rad/sec
B. 2.13 rad/sec
C. 4.12 rad/sec
D. 3.24 rad/sec
Answer» E.
Discussion
36.

Which of the following construction equipments have highest noise level?
A. Compressors
B. Generators
C. Pneumatic wrenches
D. Pumps
Answer» D. Pumps
Discussion
37.

What is meant by node point?
A. The point at which amplitude of vibration is maximum
B. The point at which amplitude of vibration is minimum
C. The point at which amplitude of vibration is zero
D. None of the above
Answer» D. None of the above
Discussion
38.

The noise level generated by domestic air conditioner ranges between _________
A. 38 dB to 70 dB
B. 35 dB to 52 dB
C. 62 dB to 88 dB
D. 50 dB to 60 dB
Answer» E.
Discussion
39.

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?
A. Terminology
B. Methods of testing
C. Methods of measurement
D. None of the above
Answer» E.
Discussion
40.

What is meant by geometric modeling?
A. Representation of an object with graphical information
B. Representation of an object with non-graphical information
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
41.

Which of the following absorptive treatment can be used to cover the interior of a box to prevent the reverberant sound?
A. Open cell foam
B. Glass fiber mat
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
42.

What is meant by Reverberant chamber?
A. Chambers having walls, ceiling and flooring acoustically reflected
B. Chambers having walls, ceiling and flooring covered by sound absorbing materials
C. Chambers having walls and ceiling made of different absorbing material
D. None of the above
Answer» B. Chambers having walls, ceiling and flooring covered by sound absorbing materials
Discussion
43.

Which type of earplugs contain silicon rubber and a fixing agent?
A. Semi insert protectors
B. Custom moulded earplugs
C. Pre-fabricated earplugs
D. Canal caps
Answer» C. Pre-fabricated earplugs
Discussion
44.

Determine velocity of sound in air at 50o. (For air, γ = 1.4)
A. 1002.5 m/s
B. 360.45 m/s
C. 350 m/s
D. None of the above
Answer» C. 350 m/s
Discussion
45.

Simulation is a process which _________
A. involves formation of a prototype
B. explores behavior of a model by varying input variables
C. develops geometry of an object
D. all of the above
Answer» C. develops geometry of an object
Discussion
46.

Which of the following methods can be used to reduce excitation level at the source?
A. Lubrication of joints
B. Balancing inertia forces
C. Both a. and b.
D. None of the above
Answer» D. None of the above
Discussion
47.

Seismometer can be used to measure acceleration of any instrument only if _____
A. it's natural frequency is high
B. it generates output signal which is proportional to relative acceleration of the vibrating object
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
48.

Which basic document describes general requirements for measurement and evaluation of machine vibrations using shaft measurements?
A. ISO – 10816-1
B. ISO – 7919-1
C. Both a. and b.
D. None of the above
Answer» C. Both a. and b.
Discussion
49.

Which of the following conditions is/are to be satisfied by the seismometer for it to be used as velometer?
A. It's natural frequency should be large
B. It's natural frequency should be small
C. It's output signal should be proportional to relative acceleration of the vibrating body
D. None of the above
Answer» C. It's output signal should be proportional to relative acceleration of the vibrating body
Discussion
50.

Sound wave has a frequency of 8 kHz at 22o C. Determine its wavelength.
A. 0.043 m
B. 0.039 m
C. 0.125 m
D. 0.0125 m
Answer» B. 0.039 m
Discussion