# Multiple Choice Questions (MCQ) on friction

The force of friction is maximum when the surface

1. Is on the point of motion
2. Is at rest
3. Is moving
4. The friction remains same at all points

(Ans:a)

The types of threads used in Screw jacks are

2. Square
3. ACME
4. Buttress

(Ans:b)

1. p/2
2. p
3. 2p
4. p/3

Where p = pitch

(Ans:b)

The slope of the thread with horizontal is known as

1. helix
3. pitch
4. helix angle

(Ans:d)

The flat pivot bearing is used to bear

1. axial thrust
3. both radial and axial thrust
4. None of the above

(Ans:a)

In plate clutch, the clutch plate is placed

1. Before flywheel
2. After pressure plate
3. In between pressure plate and flywheel
4. None of the above

(Ans:c)

The clutch is placed in four-wheeler, in between

1. Engine and gear box
2. Gear box and differential
3. Propeller shaft and differential
4. None of the above

(Ans:a)

The radius of friction circle is independent of

1. Weight of the shaft
3. Coefficient of friction
4. All of the above

(Ans:a)

In rotation of shaft, the power lost in friction is given by

1. W x µ x V Watts
2. W x µ x V Kilo-watts
3. W x µ / V Watts
4. W x µ / V Kilo-watts

Where, W=Weight of shaft, µ=Coefficient of friction, V= Velocity of shaft (in m/s)

(Ans:a)