When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.

For same pulley diameters, center distance, belt speed and belt and pulley materials,

A

Open belt drive transmits more power than crossed belt drive

B

Crossed belt drive transmits more power than open belt drive

C

Open and crossed belt drives transmit same power

D

Power transmission does not depend upon open and crossed types of constructions

When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.

A

Same

B

Opposite

C

Perpendicular

D

None of these

In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be

A

Increase key length

B

Increase key depth

C

Increase key width

D

Double all the dimensions

The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If Z is open, which of the following must be true?

A

S is open

B

T is open

C

U is open

D

y is open

The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If R is closed and U is open, which of the following must be true?

A

S is open

B

T is open

C

T is closed

D

Y is closed

The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

A

$$\frac{{\text{D}}}{{{\text{D}} - {\text{d}}}}$$

B

$$\frac{{\text{D}}}{{{\text{D}} + {\text{d}}}}$$

C

$$\frac{{2{\text{D}}}}{{{\text{D}} - {\text{d}}}}$$

D

$$\frac{{2{\text{D}}}}{{{\text{D}} + {\text{d}}}}$$

The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If the maximum number of valves that can be closed at the same time are closed which of the following must true?

A

R is open

B

S is open

C

T is open

D

Z is open

The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

A

Heavier

B

Lighter

C

Moderate

D

None of these

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

D

None of these

The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

A

n

B

n²

C

2n

D

2n - 1

When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.

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