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Mechanical Engineering MCQs with Explanations

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1961Mechanical EngineeringMedium

According to principle of moments________?

Aif a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

Bif a system of coplanar forces is in equilibrium, then their algebraic sum is zero

Cpositive and negative couples can be balanced

Dnone of the above

Ethe algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

Correct answer

A. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

Explanation

The correct answer is if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero.

1962Mechanical EngineeringMedium

Which is the correct statement about law of polygon of forces?

Aif a polygon representing forces acting at a point is closed then forces are in equilibrium

Bnone of the above.

Cif any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

Dif any number of forces acting at a point can be represented by the sides

Eif any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

Correct answer

E. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

Explanation

The correct answer is if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium.

1963Mechanical EngineeringMedium

White cast iron________?

Ais produced by annealing process. It is soft, tough and easily machined metal

Bis produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Ccontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Dis also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Enone of the above

Correct answer

D. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Explanation

The correct answer is is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable.

1964Mechanical EngineeringMedium

Limiting force of friction is the________?

Athe friction force acting when the body is just about to move

Bratio of limiting friction and normal reaction

Cthe friction force acting when the body is in motion

Dtangent of angle between normal-reaction and the resultant of normal reaction and limiting friction

Eminimum force of friction

Correct answer

A. the friction force acting when the body is just about to move

Explanation

The correct answer is the friction force acting when the body is just about to move.

1965Mechanical EngineeringMedium

Scheduling gives information about________?

Athat how idle time can be minimized

Bwhen work should complete

Cwhen work should start and how much work should be completed during a certain period

Dnone of the above

Eproper utilisation of machines

Correct answer

C. when work should start and how much work should be completed during a certain period

Explanation

The correct answer is when work should start and how much work should be completed during a certain period.

1966Mechanical EngineeringMedium

Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio________?

A60 : 40

B40 : 60

C30 : 70

D70 : 30

E50 : 50

Correct answer

C. 30 : 70

Explanation

The correct answer is 30 : 70.

1967Mechanical EngineeringMedium

The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for________?

Afullering and caulking

Breducing stress concentration

Cease of manufacture

Dall of the above

Esafety

Correct answer

A. fullering and caulking

Explanation

The correct answer is fullering and caulking.

1968Mechanical EngineeringMedium

Fire tube boilers are limited to a maximum design working pressure of ________?

A6 kg/cm

B17 kg/cm2

C100 kg/cm2

D1 kg/cm

E250 kg/cm2

Correct answer

B. 17 kg/cm2

Explanation

The correct answer is 17 kg/cm2.

1969Mechanical EngineeringMedium

For starting an axial flow pump, its delivery valve should be________?

Aclosed

Bcould be either open or closed

Copen

Dpartly open and partly closed

Edepends on starting condition and flow desired

Correct answer

C. open

Explanation

The correct answer is open.

1970Mechanical EngineeringMedium

Isochoric process is one in which________?

Ano mechanical work is done by the system

Bmass and energy transfer do not take place

Cvery little mechanical work is done by the system

Dall parameters remain constant

Efree expansion takes place

Correct answer

A. no mechanical work is done by the system

Explanation

The correct answer is no mechanical work is done by the system.

According to principle of moments________?

Aif a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

Bif a system of coplanar forces is in equilibrium, then their algebraic sum is zero

Cpositive and negative couples can be balanced

Dnone of the above

Ethe algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

Correct answer

A. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

Explanation

The correct answer is if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero.

Which is the correct statement about law of polygon of forces?

Aif a polygon representing forces acting at a point is closed then forces are in equilibrium

Bnone of the above.

Cif any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium

Dif any number of forces acting at a point can be represented by the sides

Eif any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

Correct answer

E. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

Explanation

The correct answer is if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium.

White cast iron________?

Ais produced by annealing process. It is soft, tough and easily machined metal

Bis produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Ccontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Dis also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Enone of the above

Correct answer

D. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Explanation

The correct answer is is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable.

Limiting force of friction is the________?

Athe friction force acting when the body is just about to move

Bratio of limiting friction and normal reaction

Cthe friction force acting when the body is in motion

Dtangent of angle between normal-reaction and the resultant of normal reaction and limiting friction

Eminimum force of friction

Correct answer

A. the friction force acting when the body is just about to move

Explanation

The correct answer is the friction force acting when the body is just about to move.

Scheduling gives information about________?

Athat how idle time can be minimized

Bwhen work should complete

Cwhen work should start and how much work should be completed during a certain period

Dnone of the above

Eproper utilisation of machines

Correct answer

C. when work should start and how much work should be completed during a certain period

Explanation

The correct answer is when work should start and how much work should be completed during a certain period.

Isochoric process is one in which________?

Ano mechanical work is done by the system

Bmass and energy transfer do not take place

Cvery little mechanical work is done by the system

Dall parameters remain constant

Efree expansion takes place

Correct answer

A. no mechanical work is done by the system

Explanation

The correct answer is no mechanical work is done by the system.