The efficiency of regenerative cycle will be ____ the efficiency of the Rankine cycle.

Which of the following statements are correct regarding the Rankine cycle? For a given set of operating pressure limits of a Rankine cycle, superheating the steam beyond the saturation temperature at the boiler pressure will result in: a. an increase in the moisture content of steam leaving the turbine b. an increase in thermal efficiency of the Rankine cycle c. an increase in the mean temperature of heat addition d. a decrease in the amount of heat rejected in the condenser

A

b and c

B

a and d

C

a and b

D

c and d

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: In a power plant working on a Ranking cycle, the regenerative feed water heating improves the efficiency of the steam turbine. Reason [r]: The regenerative feed water heating raises the average temperature of heat addition in the Rankine cycle.

A

Both [a] and [r] are true and [r] is the correct reason for [a].

B

Both [a] and [r] are true but [r] is NOT the correct reason for [a].

C

Both [a] and [r] are false

D

[a] is false and [r] is true.

Consider the following Statements in respect of regenerative Rankine cycle: 1) Regeneration increases the efficiency of the cycle. 2) The boiler capacity is increased for a given output. 3) The capacity of the condenser is reduced. Which of the above statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

If Tm be the mean temperature of heat addition in Rankine cycle as shown in diagram, what will the formula for efficiency of Rankine cycle?

A

(ηr) = (T3 / Tm)

B

(ηr) = 1 – (T3 / Tm)

C

(ηr) = 1 – (T2 / Tm)

D

(ηr) = (T2 / Tm)

The efficiency of an ideal regenerative cycle is ____ the Carnot cycle efficiency.

A

greater than

B

equal to

C

less than

D

none of the mentioned

The efficiency of regenerative Stirling cycle is ____ the efficiency of Carnot cycle.

A

more than

B

less than

C

equal to

D

none of the mentioned

The efficiency of Carnot cycle is ____ the efficiency of Rankine cycle.

A

less than

B

greater than

C

equal to

D

none of the mentioned

When compared with the Rankine cycle, the ideal regenerative cycle has

A

less net work output

B

more steam rate

C

more efficient

D

all of the mentioned

The relation between the steam rate of ideal regenerative cycle & steam rate of rankine cycle is?

A

steam rate of ideal regenerative cycle = steam rate of rankine cycle

B

steam rate of ideal regenerative cycle > steam rate of rankine cycle

C

steam rate of ideal regenerative cycle < steam rate of rankine cycle

D

no relation

Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle 4. Diesel cycle 5. Brayton cycle

A

P – S – 5, R – U – 3, P – S – 1, Q – T - 2

B

P – S – 1, R – U – 3, P – S – 4, P – T - 2

C

R – T – 3, P – S – 1, P – T – 4, Q – S - 5

D

P – T – 4, R – S – 3, P – S – 1, P – S - 5

The efficiency of regenerative cycle will be ____ the efficiency of the Rankine cycle.

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