Theory of machines MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Theory of machines, a fundamental topic in the field of Mechanical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Theory of machines MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Theory of machines mcq questions that explore various aspects of Theory of machines problems. Each MCQ is crafted to challenge your understanding of Theory of machines principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Mechanical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Theory of machines MCQs are your pathway to success in mastering this essential Mechanical Engineering topic.

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Theory of machines MCQs | Page 5 of 48

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Q41.
If ฯ‰/ฯ‰n is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

a.

0°

b.

90°

c.

180°

d.

360°

Discuss
Answer: (c).180°
Q42.
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

a.

total lift, total angle of lift, minimum radius of cam and cam speed

b.

radius of circular arc, cam speed, location of centre of circular arc and roller diameter

c.

mass of cam follower linkage, spring stiffness and cam speed

d.

total lift, centre of gravity of the cam and cam speed

Discuss
Answer: (a).total lift, total angle of lift, minimum radius of cam and cam speed
Q43.
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be

a.

stable

b.

unstable

c.

isochronous

d.

none of these

Discuss
Answer: (b).unstable
Q44.
A rotor supported at A and B carries two masses as shown in the below figure. The rotor is

a.

dynamically balanced

b.

statically balanced

c.

statically and dynamically balanced

d.

not balanced

Discuss
Answer: (c).statically and dynamically balanced
Q45.
In the two rotor system as shown in the below figure (I1 < I2), a node of vibration is situated

a.

between I1, and I2 but nearer I1

b.

between I1, and I2 but nearer to I2

c.

exactly in the middle of the shaft

d.

nearer to I1 but outside

Discuss
Answer: (b).between I1, and I2 but nearer to I2
Q46.
In the below figure, PC is the connecting rod and OC is the crank making an angle ฮธ with the line of stroke PO and rotates with uniform angular velocity at ฯ‰ rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, the acceleration of the piston is zero when the crank OC and connecting rod PC are at right angles to each other.

a.

Correct

b.

Incorrect

c.

May be correct or incorrect

d.

None of these

Discuss
Answer: (a).Correct
Q47.
For the brake to be self locking, the force P at C shown in the below figure, should

a.

be zero

b.

act in upward direction

c.

act in downward direction

d.

none of these

Discuss
Answer: (a).be zero
Q48.
In the below figure, PC is the connecting rod and OC is the crank making an angle ฮธ with the line of stroke PO and rotates with uniform angular velocity at ฯ‰ rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, if N coincides with O, then

a.

acceleration and velocity of the piston P is zero

b.

acceleration and velocity of the piston P is maximum

c.

acceleration of the piston P is zero and its velocity is maximum

d.

acceleration of the piston P is maximum and its velocity is zero

Discuss
Answer: (c).acceleration of the piston P is zero and its velocity is maximum
Q49.
In the below figure, PC is the connecting rod and OC is the crank making an angle ฮธ with the line of stroke PO and rotates with uniform angular velocity at ฯ‰ rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO. The acceleration of the piston P with respect to the crankpin C is given by

a.

ฯ‰² x NO

b.

ฯ‰² x CO

c.

ฯ‰² x CN

d.

ฯ‰² x QN

Discuss
Answer: (c).ฯ‰² x CN
Q50.
The factor which affects the critical speed of a shaft is

a.

diameter of disc

b.

span of shaft

c.

eccentricity

d.

all of these

Discuss
Answer: (d).all of these
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