1. The train value of a gear train is ?

equal to velocity ratio of a gear train

reciprocal of velocity ratio of a gear train

always greater than unity

always less than unity

Answer: reciprocal of velocity ratio of a gear train

Explanation:


2. When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a ?

screw pair

spherical pair

turning pair

sliding pair

Answer: screw pair

Explanation:


3. The radial distance of a tooth from the pitch circle to the bottom of the tooth is called ?

dedendum

addendum

clearance

working depth

Answer: dedendum

Explanation:


4. Frequency of vibrations is usually expressed in ?

number of cycles per hour

number of cycles per minute

number of cycles per second

none of these

Answer: number of cycles per second

Explanation:


5. When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a ?

screw pair

spherical pair

turning pair

sliding pair

Answer: sliding pair

Explanation:


6. The maximum frictional force, which comes into play, when an body just begins to slide over the surface of the other body, is known as ?

static friction

dynamic friction

limiting friction

coefficient of friction

Answer: limiting friction

Explanation:


7. The load cup of a screw jack is made separate from the head of the spindle to ?

enhance the load carrying capacity of the jack

reduce the effort needed for lifting the working load

reduce the value of frictional torque required to be countered for lifting the load

prevent the rotation of load being lifted

Answer: prevent the rotation of load being lifted

Explanation:


8. The centrifugal tension in belts ?

increases power transmitted

decreases power transmitted

have no effect on power transmitted

increases power transmitted upto a certain speed and then decreases

Answer: have no effect on power transmitted

Explanation:


9. In a steam engine, the link constitutes a ?

piston, piston rod and crosshead

connecting rod with big and small end brasses, caps and bolts

crank pin, crankshaft and flywheel

all of the above

Answer: all of the above

Explanation:


10. In gears, interference takes place when ?

the tip of a tooth of a mating gear digs into the portion between base and root circles

gears do not move smoothly in the absence of lubrication

pitch of the gears is not same

gear teeth are undercut

Answer: the tip of a tooth of a mating gear digs into the portion between base and root circles

Explanation: