MCQOPTIONS
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MCQOPTIONS
This section includes 61 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A system, which is fixed from one end or both the ends is referred as |
| A. | Definite system |
| B. | Semidefinite system |
| C. | Both a and b |
| D. | None of the above |
| Answer» B. Semidefinite system | |
| 2. |
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 | |
| 3. |
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 | |
| 4. |
Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6th in two cycles. |
| A. | 0.223 |
| B. | 0.8958 |
| C. | 0.389 |
| D. | None of the above |
| Answer» C. 0.389 | |
| 5. |
Calculate equivalent stiffness of the spring for the system shown below, which has spring stiffness of 3000 N/m |
| A. | 1000 N/m |
| B. | 2250 N/m |
| C. | 2000 N/m |
| D. | None of the above |
| Answer» C. 2000 N/m | |
| 6. |
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 | |
| 7. |
Which among the following is the value of static deflection ( ) for a fixed beam with central point load? |
| A. | (Wl3) /(192 EI) |
| B. | (Wl2) /(192 EI) |
| C. | (Wl3) /(384 EI) |
| D. | None of the above |
| Answer» B. (Wl2) /(192 EI) | |
| 8. |
The motion of a system executing harmonic motion with one natural frequency is known as _______ |
| A. | principal mode of vibration |
| B. | natural mode of vibration |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 9. |
Fourier transform is a mathematical procedure to obtain the __________ of a given input signal. |
| A. | spectrum |
| B. | integration |
| C. | difference |
| D. | none of the above |
| Answer» B. integration | |
| 10. |
From the following data, calculate the location of node from the left end of shaft (l1).l1=0.6m, l2=0.5m, l3=0.4m d1=0.095m, d2=0.06m, d3=0.05m Ma = 900 Kg, Mb = 700 Kg ka = 0.85m, kb = 0.55m |
| A. | 0.855m |
| B. | 0.795m |
| C. | 0.695m |
| D. | 0.595m |
| Answer» B. 0.795m | |
| 11. |
The velocity of a particle moving with simple harmonic motion is _______ at the mean position. |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 12. |
The motion of a system executing harmonic motion with one natural frequency is known as _______ |
| A. | principal mode of vibration |
| B. | natural mode of vibration |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 13. |
Consider P and Q as the shaft having two rotors at the end of it, what is the point N known as in the given figure? |
| A. | Node |
| B. | Elastic point |
| C. | Inelastic point |
| D. | Breaking point |
| Answer» B. Elastic point | |
| 14. |
n the given figure if N is the node then NQ acts as which of the following system? |
| A. | Single rotor system |
| B. | Two rotor system |
| C. | Three rotor system |
| D. | Four rotor system |
| Answer» B. Two rotor system | |
| 15. |
In the figure given below, the points N1 and N2 are known as_______ |
| A. | Nodes |
| B. | Elastic points |
| C. | Inelastic points |
| D. | Breaking points |
| Answer» B. Elastic points | |
| 16. |
In the given figure, m1=20 Kg, m2=30Kg and m=50 Kg, if r1=0.2m and r=0.3m, l=1m, find l2. |
| A. | 0.26m |
| B. | 0.52m |
| C. | 1.04m |
| D. | 13m |
| Answer» B. 0.52m | |
| 17. |
A vertical spring-mass system has a mass of 0.5 kg and an initial deflection of 0.2 cm. Find the spring stiffness. |
| A. | 345 N/m |
| B. | 245 N/m |
| C. | 3452 N/m |
| D. | 2452 N/m |
| Answer» E. | |
| 18. |
Let the disturbing mass be 200 kg and the radius of rotation be 20 cm and the rotation speed be 50 rad/s, then calculate the centripetal force in kN. |
| A. | -50 |
| B. | -25 |
| C. | -100 |
| D. | -2500 |
| Answer» D. -2500 | |
| 19. |
Let the disturbing mass be 100 kg and the radius of rotation be 10 cm and the rotation speed be 50 rad/s, then calculate the centrifugal force in kN. |
| A. | 50 |
| B. | 25 |
| C. | 50000 |
| D. | 25000 |
| Answer» C. 50000 | |
| 20. |
Let the centrifugal force in kN be 25 and the radius of rotation be 20 cm and the rotation speed be 50 rad/s, then calculate the mass defect in Kg. |
| A. | 50 |
| B. | 25 |
| C. | 50000 |
| D. | 25000 |
| Answer» B. 25 | |
| 21. |
Which of the following statements are associated with complete dynamic balancing of rotating systems? 1. Resultant couple due to all inertia forces is zero. 2. Support reactions due to forces are zero but not due to couples . 3. The system is automatically statically balanced. 4. Centre of masses of the system lies on the axis of rotation. |
| A. | 1, 2, 3 and 4 |
| B. | 1, 2, and 3 only |
| C. | 2, 3 and 4 only |
| D. | 1, 3 and 4 only |
| Answer» E. | |
| 22. |
For a two rotor system, the mass moment of inertia of one shaft(A) is twice the other(B), then what is the relation between the length of the shafts. |
| A. | 2L(A) = L(B) |
| B. | L(A) = 2L(B) |
| C. | L(A) = L(B) |
| D. | 2L(A) = 3L(B) |
| Answer» B. L(A) = 2L(B) | |
| 23. |
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. | |
| 24. |
The sound waves behave in a much more complex fashion, and there is no fixed relationship between ________________. |
| A. | Sound pressure |
| B. | pressure and distance |
| C. | Sound energy |
| D. | Sound intensity |
| Answer» C. Sound energy | |
| 25. |
If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor? |
| A. | 0 |
| B. | 0.5 |
| C. | 0.25 |
| D. | Infinity |
| Answer» E. | |
| 26. |
_________ is a pressure type microphone with permanent coil as a transducing element. |
| A. | Dynamic |
| B. | Condenser |
| C. | Magnetic |
| D. | Carbon |
| Answer» B. Condenser | |
| 27. |
Which of the following statements is correct about the balancing of a mechanical system? |
| A. | If it is under static balance, then there will be dynamic balance also |
| B. | If it is under dynamic balance, then there will be static balance also |
| C. | Both static as well as dynamic balance have to be achieved separately |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 28. |
The most important terms that are used to describe the sound field around a sound emitting object |
| A. | Far , Near Field |
| B. | Free ,Diffuse Field |
| C. | A and B both |
| D. | None of the above |
| Answer» D. None of the above | |
| 29. |
If all the masses are in one plane, then what is the maximum no. of masses which can be placed in the same plane? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | No limitation |
| Answer» E. | |
| 30. |
Which among the following has a constant power spectral density over a wide frequency range? |
| A. | White noise |
| B. | Black noise |
| C. | Pink noise |
| D. | Blue noise |
| Answer» B. Black noise | |
| 31. |
The process of maintaining appropriate noise level without considering economic factors is called as _____ |
| A. | noise control |
| B. | noise reduction |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 32. |
It is an audio transducer that converts acoustic pressure in air into its equivalent electrical impulses |
| A. | Loudspeaker |
| B. | Amplifier |
| C. | Baffle |
| D. | Microphone |
| Answer» E. | |
| 33. |
The maximum acceleration of a particle moving with simple harmonic motion is ____. |
| A. | |
| B. | .r |
| C. | / 2 |
| D. | 2 / |
| Answer» C. / 2 | |
| 34. |
In a revolving rotor, the centrifugal force remains balanced as long as the centre of the mass of the rotor lies ___________ |
| A. | Below the axis of shaft |
| B. | On the axis of the shaft |
| C. | Above the axis of shaft |
| D. | Away from the axis of shaft |
| Answer» C. Above the axis of shaft | |
| 35. |
In order to achieve stability, the sum of secondary forces and secondary couples must be ------- and their respective polygons must be ...... |
| A. | Zero, Closed |
| B. | one, Open |
| C. | Zero, open |
| D. | one, closed |
| Answer» B. one, Open | |
| 36. |
The numerical values of the secondary forces and secondary couples couples may be obtained by considering the ___________ |
| A. | Revolving mass |
| B. | Reciprocating mass |
| C. | Translating mass |
| D. | Rotating mass |
| Answer» B. Reciprocating mass | |
| 37. |
The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is |
| A. | 0 |
| B. | 90 |
| C. | 180 |
| D. | 360 |
| Answer» D. 360 | |
| 38. |
In a multicylinder inline engine, each imaginary secondary crank with a mass attached to the crankpin is inclined to the line of stroke at which angle? |
| A. | Twice the angle of crank |
| B. | Half the angle of crank |
| C. | Thrice the angle of crank |
| D. | Four times the angle of crank |
| Answer» B. Half the angle of crank | |
| 39. |
The mass moment of inertia of the two motors in a two rotor system are 100 kgm2 and 10 kgm2 the length of the shaft of uniform |
| A. | 80 cm |
| B. | 90 cm |
| C. | 100 cm |
| D. | 110 cm |
| Answer» D. 110 cm | |
| 40. |
Often an unbalance of forces is produced in rotary or reciprocating machinery due to the ______ |
| A. | Centripetal forces |
| B. | Centrifugal forces |
| C. | Friction forces |
| D. | Inertia forces |
| Answer» E. | |
| 41. |
The accelerometer is used as a transducer to measure earthquake in Richter scale. Its design is based on the principle that ______. |
| A. | its natural frequency is very low in comparison to the frequency of vibration |
| B. | its natural frequency is very high in comparison to the frequency of vibration |
| C. | its natural frequency is equal to the frequency of vibration |
| D. | measurement of vibratory motion is without any reference point |
| Answer» D. measurement of vibratory motion is without any reference point | |
| 42. |
When the body vibrates under the influence of external force, then the body is said to be under ___________ . |
| A. | Free vibrations |
| B. | Natural vibrations |
| C. | Forced vibrations |
| D. | Damped vibrations |
| Answer» D. Damped vibrations | |
| 43. |
From the given data, calculate the unbalanced centrifugal force in N s2 Distance from shaft = 0.2 m Mass = 100 kg Rotating speed = 1000 rpm. |
| A. | 20 |
| B. | 2 10^7 |
| C. | 200 |
| D. | 20000 |
| Answer» D. 20000 | |
| 44. |
For a V-twin engine, which of the following means can be used to balance the primary forces? |
| A. | Revolving balance mass |
| B. | Rotating balance mass |
| C. | Reciprocating balance mass |
| D. | By the means of secondary forces |
| Answer» B. Rotating balance mass | |
| 45. |
In a locomotive, the ratio of the connecting rod length to the crank radius is kept very large in order to |
| A. | minimize the effect of primary forces |
| B. | minimize the effect of secondary forces |
| C. | have perfect balancing |
| D. | start the locomotive conveniently |
| Answer» C. have perfect balancing | |
| 46. |
Consider the following statements: Two rotors mounted on a single shaft can be considered to be equivalent to a geared-shaft system having two rotors provided 1. The kinetic energy of the equivalent system is equal to that of the original system. 2. The strain energy of the equivalent system is equal to that of the original system. 3. The shaft diameters of the two systems are equal. Which of these statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» B. 1 and 2 | |
| 47. |
Two rotors A and B are connected to the two ends of a shaft of uniform diameter. The mass moment of inertia of rotor A about the |
| A. | 1/5 m |
| B. | 4/5 m |
| C. | 1/25 m |
| D. | 16/25 m |
| Answer» B. 4/5 m | |
| 48. |
When inertia of gearing is taken into consideration, then which of the following should be taken into account. |
| A. | Addition of rotor |
| B. | Addition of gear |
| C. | Addition of shaft |
| D. | Addition of pump |
| Answer» B. Addition of gear | |
| 49. |
At a nodal point in the shaft, the frequency of vibration is _________ |
| A. | Zero |
| B. | Double than at the ends |
| C. | Minimum |
| D. | Maximum |
| Answer» B. Double than at the ends | |
| 50. |
For occurrence of free torsional vibration in a three rotor system which of the condition is necessary? |
| A. | Rotors moving in same direction |
| B. | Rotors having same frequency |
| C. | Rotors having different frequency |
| D. | Rotors rotate in the same sense |
| Answer» C. Rotors having different frequency | |