Horsepower required for a roll crusher is directly proportional to its

Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?

A

Rod mill

B

Fluid energy mill

C

Gyratory crusher

D

Ball mill

According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than

A

0.00184

B

0.0184

C

0.184

D

1.84

A case of 12 rolls of paper towels sells for $ 9. The cost of one roll sold individually is $ 1. what is the percent of savings per per roll for the 12-roll package over the cost of 12 rolls purchased individually?

A

25%

B

90%

C

15%

D

11%

A case of 12 rolls of paper towels sells for $ 9. The cost of one roll sold individually is $ 1. what is the percent of savings per roll for the 12 roll package over the cost of 12 rolls purchased individually?

A

9%

B

33.33%

C

25%

D

15%

In a roll crusher, both the rolls

A

Have the same diameter

B

Are rotated towards each other

C

Run either at the same or different speeds

D

All of the above

In a roll crusher, the specific power consumption and the production rate is affected by the

A

Reduction ratio

B

Differential roll speed

C

Both A & B

D

Neither A nor B

If A varies directly proportional to C and B also varies directly proportional to C, which one of the following is not correct ?

A

$$\left( {A + B} \right)\alpha \,C$$

B

$$\left( {A - B} \right)\alpha \,\frac{1}{C}$$

C

$$\sqrt {AB} \,\alpha \,C$$

D

$$\frac{A}{B} = {\text{constant}}$$

A tailor had a number of shirt pieces to cut from a roll of fabric. He cut each roll of equal length into 10 pieces. He cut at the rate of 45 cuts a minute. How many rolls would be cut in 24 minutes ?

A

32 rolls

B

54 rolls

C

108 rolls

D

120 rolls

For marketing purpose, the automobile industry might want to dust off its slogan "power to the people". Detroit and the foreign automakers are in a horsepower war not seen since the muscle car era of the 1960s. What does the second sentence do?

A

It describes an effect for the cause stated in the first sentence

B

It explains the idea in the first sentence

C

it draws a conclusion.

D

it provides an example

For diesel locomotives the range of horsepower is

A

50 to 200

B

500 to 1000

C

1500 to 2500

D

3000 to 5000

Horsepower required for a roll crusher is directly proportional to its

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