The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

Consider the following statements: 1. The air standard efficiency of an Otto cycle is a function of the properties of the working substance (gas) 2. For the same compression ratio and same input, the thermal efficiency of an Otto cycle is more than that of a Diesel cycle 3. Thermal efficiency of a Diesel cycle increases with decrease of cut-off ratio Which of the above statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

A

Heat rejection is lower

B

Expansion and compression are isentropic

C

Combustion is at constant volume

D

Maximum temperature is higher

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle ____________

A

combustion is at constant volume

B

expansion and compression are isentropic

C

maximum temperature is higher

D

heat rejection is lower

For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

A

Heat rejection is lower

B

Expansion & compression are isentropic

C

Maximum temperature is higher

D

Combustion is at constant volume

For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

A

Heat rejection is lower

B

Expansion & compression are isentropic

C

Maximum temperature is higher

D

Combustion is at constant volume

The air standard efficiency of an otto cycle compared to a diesel cycle for the given compression ratio is?

A

same

B

less

C

more

D

more or less depending on other factors

Study the following table: June 2007 December 2014 Price of petrol in Rs/litre 47.74 61.33 Price of diesel in Rs/litre 35.21 50.51 After studying the above table, Devmeet a class V student wrote the following in his notebook: A. Petrol is more expensive fuel than diesel. B. The percentage increase in the price of diesel is more than that of petrol. C. Diesel is cheaper and that is why public transport runs on it. D. Diesel is cheaper fuel than petrol. People should buy diesel vehicles. Which one of the following is correct?

A

C and D are inferences

B

A and D are observations

C

A and C are observations

D

B and C are inferences

A company recruits candidates satisfying the following criteria - 1. Candidates who secured at least 85% in standard 10th or equivalent. 2. Candidates who secured at least 65% in standard 12th or equivalent. 3. Candidates who are not from commerce background. Who among the following candidates will the company definitely select? A. Jitesh is a science student having scored 70% in standard 12th and 80% in 10th with an excellent sports background. B. Jignesh scored 80% in standard 12th, 90% in standard 10th and secured 2nd place in his college among all commerce students. C. Jayesh scored 75% in standard 10th, 75% in standard 12th and is an arts student. D. Jinesh secured 80% in standard 12th, 88% in standard 10th and is a science student with great acting skills

A

B

D

C

D

A

The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

A

1 - rγ - 1

B

1 + rγ - 1

C

1 - (1/ rγ - 1)

D

1 + (1/ rγ - 1)

The air standard efficiency of an Otto cycle is given by (where r = Compression ratio and $$\gamma $$ = Ratio of specific heats)

A

$$1 - {{\text{r}}^{\gamma - 1}}$$

B

$$1 + {{\text{r}}^{\gamma - 1}}$$

C

$$1 - \frac{1}{{{{\text{r}}^{\gamma - 1}}}}$$

D

$$1 + \frac{1}{{{{\text{r}}^{\gamma - 1}}}}$$

The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

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