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111.

In actual machines, mechanical advantage is

A.	equal to	B.	less than
C.	greater than

112.

A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.

Right

Wrong

113.

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

114.

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

115.

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

Yes

116.

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

True

False

117.

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

Agree

Disagree

118.

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

119.

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

120.

For a self locking machine, the efficiency must be

A.	equal to 50%	B.	less than 50%
C.	greater than 50%	D.	100%