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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_________________?
A the weight of the body
B more than the weight of the body
C less than the weight of the body
D weight of the fluid displaced by the body
Correct Answer: weight of the fluid displaced by the body
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
A 10 m/sec
B 25 m/sec
C 2 m/sec
D 50 m/sec
Correct Answer: 2 m/sec
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
A 1 : 5
B 1 : 2.5
C 1 :25
D 1:V5″
Correct Answer: 1 : 5
The two important forces for a floating body are__________________?
A buoyancy, gravity
B buoyancy, pressure
C buoyancy, inertial
D inertial, gravity
Correct Answer: buoyancy, gravity
Center of pressure on an inclined plane is___________________?
A at the centroid
B above the centroid
C below the centroid
D at metacentre
Correct Answer: below the centroid
The centre of gravity of the volume of the liquid displaced by an immersed body is called ___________________?
A centre of gravity
B centre of pressure
C metacentre
D centre of buoyancy
Correct Answer: centre of buoyancy
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be __________________?
A 2 metres of water column
B 3 metres of water column
C 3.5 metres of water column
D 4 m of water column
Correct Answer: 3 metres of water column
In an immersed body, centre of pressure is __________________?
A at the centre of gravity
B above the centre of gravity
C below be centre of gravity
D could be above or below e.g. depend¬ing on density of body and liquid
Correct Answer: below be centre of gravity
True one-dimensional flow occurs when_________________?
A the direction and magnitude of the veiocity at all points are identical
B the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C the magnitude and direction of the velocity do not change from point to point in the fluid
D the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
Correct Answer: the direction and magnitude of the veiocity at all points are identical
Gradually varied flow is__________________?
A steady uniform
B non-steady non-uniform
C non-steady uniform
D steady non-uniform
Correct Answer: steady non-uniform
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