In larger industrial and commercial reciprocating compression systems, refrigerant widely used is

The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

A

$${\text{m}}{\omega ^2}{\text{r}}\sin \theta $$

B

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$

C

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\sin 2\theta }}{{\text{n}}}$$

D

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\cos2\theta }}{{\text{n}}}$$

The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

A

$${\text{m}}{\omega ^2}{\text{r}}\sin \theta $$

B

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$

C

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\sin 2\theta }}{{\text{n}}}$$

D

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\cos2\theta }}{{\text{n}}}$$

Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?

A

Freon

B

Liquid sulphur dioxide

C

Methyl chloride

D

Ammonia

Defining green banking is relatively easy. It means promoting environment -friendly practices and reducing your carbon footprint from your banking activities. This comes in many forms : using online banking instead of branch banking; paying bills online, opening up CDs (certificates of deposit) and money market accounts at online banks instead of large multi-branch banks. A green bank takes the biggest steps to support local green initiatives. Any combination of the above personal banking practices can help the environment. In this respect, online banks and smaller community banks have better track records than larger banks .However, these larger banks may be induced to go green . According to the passage, larger, multi -branch banks .

A

can never become green banks .

B

can become green banks if they reduce the number of branches and eliminate the use of paper .

C

can become green banks if they can greatly reduce or eliminate carbon footprint form their banking activities.

D

can become green banks if they support local green initiatives

A small square region inside a larger square is shaded. The diagonal of the larger square is three times the diagonal of the small square in length. What fraction of the area of the larger square is not shaded?

A

1/9

B

1/3

C

2/3

D

8/9

The reciprocating refrigerant compressors are very suitable for

A

Small displacements and low condensing pressures

B

Large displacements and high condensing pressures

C

Small displacements and high condensing pressures

D

Large displacements and low condensing pressures

The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank and $$\theta $$ = Angle of inclination of crank to the line of stroke)

A

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$

B

$${\text{cm}}{\omega ^2}{\text{r}}\sin \theta $$

C

$$\left( {1 - {\text{c}}} \right){\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$

D

$${\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. The saving in case of a double acting reciprocating pump is

A

39.2%

B

48.8%

C

84.8%

D

88.4%

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

A

39.2%

B

48.8%

C

84.8%

D

88.4%

In a reciprocating engine, usually __________ of the reciprocating masses are balanced.

A

One-half

B

Two-third

C

Three-fourth

D

Whole

In larger industrial and commercial reciprocating compression systems, refrigerant widely used is

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