Mechanical Engineering Archives | Page 72 of 109

If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

September 14, 2022 by QuizMaster

Question: If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys
[A].

first

[B].

second

[C].

third

Answer: Option B

Explanation:

No answer description available for this question.

For a self locking machine, the efficiency must be

September 14, 2022 by QuizMaster

Question: For a self locking machine, the efficiency must be
[A].

equal to 50%

[B].

less than 50%

[C].

greater than 50%

[D].

100%

Answer: Option B

Explanation:

No answer description available for this question.

A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

September 14, 2022 by QuizMaster

Question: A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
[A].

reversible

[B].

non-reversible

[C].

ideal

Answer: Option A

Explanation:

No answer description available for this question.

A screw jack used for lifting the loads is

September 14, 2022 by QuizMaster

Question: A screw jack used for lifting the loads is
[A].

a reversible machine

[B].

a non-reversible machine

[C].

an ideal machine

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

A non-reversible machine is also called a self-locking machine.

September 14, 2022 by QuizMaster

Question: A non-reversible machine is also called a self-locking machine.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.

September 14, 2022 by QuizMaster

Question: A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

September 14, 2022 by QuizMaster

Question: If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
[A].

30°

[B].

60°

[C].

90°

[D].

120°

Answer: Option D

Explanation:

No answer description available for this question.

A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.

September 14, 2022 by QuizMaster

Question: A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.
[A].

Yes

[B].

Answer: Option B

Explanation:

No answer description available for this question.

A machine having an efficiency greater than 50%, is known as

September 14, 2022 by QuizMaster

Question: A machine having an efficiency greater than 50%, is known as
[A].

reversible machine

[B].

non-reversible machine

[C].

neither reversible nor non-reversible machine

[D].

ideal machine

Answer: Option A

Explanation:

No answer description available for this question.

A machine having an efficiency less than 50%, is known as

September 14, 2022 by QuizMaster

Question: A machine having an efficiency less than 50%, is known as
[A].

reversible machine

[B].

non-reversible machine

[C].

neither reversible nor non-reversible machine

[D].

ideal machine

Answer: Option B

Explanation:

No answer description available for this question.