MCQOPTIONS
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MCQOPTIONS
This section includes 287 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Crank effort is the product of crank pin radius and |
| A. | thrust on sides |
| B. | crankpin effort |
| C. | force acting along connecting rod |
| D. | piston effort |
| Answer» C. force acting along connecting rod | |
| 52. |
In the presence of frictional resistance, the expression for piston effort is |
| A. | f(l) – f(i) |
| B. | f(l) + f(i) |
| C. | f(l) ± f(i) – r(f) |
| D. | f(l) – f(i) + r(f) |
| Answer» D. f(l) – f(i) + r(f) | |
| 53. |
When the piston is accelerated, the piston effort is given by which of the following the equation? |
| A. | f(l) – f(i) |
| B. | f(l) + f(i) |
| C. | f(l) ± f(i) |
| D. | f(l) – f(i) + r(f) |
| Answer» C. f(l) ± f(i) | |
| 54. |
In a horizontal engine, reciprocating parts are retarded when the piston moves from |
| A. | tdc to bdc |
| B. | bdc to tdc |
| C. | midway to tdc |
| D. | bdc to midway |
| Answer» C. midway to tdc | |
| 55. |
Piston effort acts along the line of stroke. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 56. |
In a horizontal engine, reciprocating parts are accelerated when the piston moves from |
| A. | tdc to bdc |
| B. | bdc to tdc |
| C. | midway to tdc |
| D. | bdc to midway |
| Answer» B. bdc to tdc | |
| 57. |
Considering a four bar chain with each link having linear and angular acceleration, applying D-Alembert’s principle will never result in which of the following member? |
| A. | 2- force member |
| B. | 3- force member |
| C. | 4 – force member |
| D. | non accelerating member |
| Answer» B. 3- force member | |
| 58. |
In the following picture the G is the center of gravity, the quantity h is known as the “offset”. I is the moment of inertia and k is the radius of gyration. Offset’s value is given by? |
| A. | i.α/f |
| B. | i.α/m.g |
| C. | i/m.k |
| D. | m.k/i |
| Answer» B. i.α/m.g | |
| 59. |
Inertia force and the reversed effective force are the same. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 60. |
A body remains in equilibrium if |
| A. | inertia force is applied in the same direction to the resultant force |
| B. | inertia force is applied in the direction opposite to the resultant force |
| C. | inertia force is applied in the direction perpendicular to the resultant force |
| D. | inertia force is applied in the direction parallel to the resultant force |
| Answer» C. inertia force is applied in the direction perpendicular to the resultant force | |
| 61. |
2 D ALEMBERT'S PRINCIPLE - DYNAMIC ANALYSIS IN RECIPROCATING ENGINES |
| A. | reversed effective force |
| B. | net force |
| C. | coriolis force |
| D. | resultant force |
| Answer» B. net force | |
| 62. |
If a force has a line of action at a distance h from the centre of gravity, then the value of h is given by |
| A. | i. α/f |
| B. | i. α/m.g |
| C. | i/m.k |
| D. | m.k/i |
| Answer» B. i. α/m.g | |
| 63. |
Inertia torque acts in the same direction as the accelerating couple? |
| A. | true |
| B. | false |
| Answer» C. | |
| 64. |
At the mean position, the potential energy of the system is _______. |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of the mentioned |
| Answer» B. Minimum | |
| 65. |
A seismometer is a device used to measure the ___________ of a vibrating body. |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | all of the above |
| Answer» B. velocity | |
| 66. |
In a multicylinder inline engine, each imaginary secondary crank with a massattached 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 | |
| 67. |
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) | |
| 68. |
In a revolving rotor, the centrifugal force remains balanced as long as thecentre 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 | |
| 69. |
The motion completed during one time period is known as _______. |
| A. | Period of vibration |
| B. | Cycle |
| C. | Frequency |
| D. | All of the above |
| Answer» C. Frequency | |
| 70. |
Which part of human ear converts sound vibrations into electrical signals |
| A. | Hammer |
| B. | Stirrup |
| C. | Tympanic membrane |
| D. | Cochlea |
| Answer» E. | |
| 71. |
The most important terms that are used to describe the sound field around asound 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 | |
| 72. |
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 provided1. 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 | |
| 73. |
From the following data, calculate the location of node from the leftend 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 | |
| 74. |
For the secondary balancing of the engine, which of the condition is necessary? |
| A. | Secondary force polygon must be close |
| B. | Secondary force polygon must be open |
| C. | Primary force polygon must be close |
| D. | Primary force polygon must be open |
| Answer» B. Secondary force polygon must be open | |
| 75. |
Let the disturbing mass be 100 kg and the radius of rotation be 10 cm and therotation speed be 50 rad/s, then calculate the centrifugal force in kN. |
| A. | 50 |
| B. | 25 |
| C. | 50000 |
| D. | 25000 |
| Answer» C. 50000 | |
| 76. |
A system, which is free from both the ends |
| A. | Definite system |
| B. | Semidefinite system |
| C. | Both a and b |
| D. | None of the above |
| Answer» C. Both a and b | |
| 77. |
Which of the following systems produce a vibration in the foundation? |
| A. | Coupled machine |
| B. | Uncoupled machine |
| C. | Balanced machine |
| D. | Unbalanced machine |
| Answer» E. | |
| 78. |
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 | |
| 79. |
A V-twin engine has the cylinder axes at 90 degrees and the connecting rods operate a common crank. The reciprocating mass per cylinder is 23 kg and the crank radius is 7.5 cm. The length of the connecting rod is 0.3 m. If the engine is rotating at the speed is 500 r.p.m. What is the value of maximum resultant secondary force in Newtons? |
| A. | 7172 |
| B. | 1672 |
| C. | 1122 |
| D. | 1272 |
| Answer» C. 1122 | |
| 80. |
'Eardrum' bursts at |
| A. | 40 dB |
| B. | 80 dB |
| C. | 160 dB |
| D. | 320 dB |
| Answer» D. 320 dB | |
| 81. |
The motion of a system executing harmonic motion with one naturalfrequency 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 | |
| 82. |
Which of the following instruments measure amplitude of a vibrating body? |
| A. | Vibrometers |
| B. | Seismometer |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 83. |
Which one of the following is correct for a shaft carrying two rotorsat its ends? |
| A. | It has no node |
| B. | It has one node |
| C. | It has two nodes |
| D. | It has three nodes |
| Answer» C. It has two nodes | |
| 84. |
Let the centrifugal force in kN be 25 and the radius of rotation be 20 cm andthe rotation speed be 50 rad/s, then calculate the mass defect in Kg. |
| A. | 50 |
| B. | 25 |
| C. | 50000 |
| D. | 25000 |
| Answer» B. 25 | |
| 85. |
In FFT Spectrum Analyzer, the A/D converter is used to ________. |
| A. | reject unwanted signals |
| B. | sets the level of the signals to be fed to the A/D converter |
| C. | convert analog signals into digital signals |
| D. | converts digital signals into analog signals |
| Answer» D. converts digital signals into analog signals | |
| 86. |
In a three rotor system, for the middle rotor, if the stiffness of boththe length either side of the rotor is increased to two times what will |
| A. | Remains constant |
| B. | Decreases by two times |
| C. | Increases by two times |
| D. | Increases by 4 times |
| Answer» D. Increases by 4 times | |
| 87. |
The mass used to balance the mass defect is known as ______ |
| A. | Balancing mass |
| B. | Defect mass |
| C. | Replacement mass |
| D. | Fixing mass |
| Answer» B. Defect mass | |
| 88. |
Following scale is used for loudness of sound or noise |
| A. | Linear scale |
| B. | Logarithmic scale |
| C. | Exponential scale |
| D. | None of the above |
| Answer» C. Exponential scale | |
| 89. |
The instruments which are used to measure the ___________ of a vibrating body arecalled vibration measuring instrument. |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | all of the above |
| Answer» E. | |
| 90. |
The mass moment of inertia of the two motors in a two rotor systemare 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 | |
| 91. |
From the following, which one is also known as low-frequency Transducer? |
| A. | Stroboscope |
| B. | Accelerometer |
| C. | Vibrometer |
| D. | None of the above |
| Answer» D. None of the above | |
| 92. |
The resonant frequency of a mass-spring system depends upon ________ |
| A. | stiffness |
| B. | surface density |
| C. | depth of air space |
| D. | all of the above |
| Answer» E. | |
| 93. |
From the given data, calculate the unbalanced centrifugal force in N s2Distance 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 | |
| 94. |
In FFT Spectrum Analyzer, the D/A converter is used to ________. |
| A. | reject unwanted signals |
| B. | sets the level of the signals to be fed to the A/D converter |
| C. | convert analog signals into digital signals |
| D. | converts digital signals into analog signals |
| Answer» E. | |
| 95. |
In the given figure, m1=20 Kg, m2=30Kg and m=50 Kg, if r1=0.2m andr=0.3m, l=1m, find l2. |
| A. | 0.26m |
| B. | 0.52m |
| C. | 1.04m |
| D. | 13m |
| Answer» B. 0.52m | |
| 96. |
The motion of a system executing harmonic motion with onenatural 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 | |
| 97. |
A vertical circular disc is supported by a horizontal stepped shaft as shown below. Determine equivalent length of shaft when equivalent diameter is 20 mm. |
| A. | 1.559 m |
| B. | 0.559 m |
| C. | 0.633 m |
| D. | None of the above |
| Answer» C. 0.633 m | |
| 98. |
The sound far field is beginning at a distance of ____________ . |
| A. | pressure and distance |
| B. | Sound energy |
| C. | Sound pressure |
| D. | 2 wavelengths away from the sound source |
| Answer» E. | |
| 99. |
_________ is a pressure type microphone with permanent coil as a transducingelement. |
| A. | Dynamic |
| B. | Condenser |
| C. | Magnetic |
| D. | Carbon |
| Answer» B. Condenser | |
| 100. |
Often an unbalance of forces is produced in rotary or reciprocating machinerydue to the ______ |
| A. | Centripetal forces |
| B. | Centrifugal forces |
| C. | Friction forces |
| D. | Inertia forces |
| Answer» E. | |