Blowby losses ____________ directly with compression ratio.

From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.

A

P, Q

B

Q, R

C

Q, S

D

R, S

In vapor compression cycle having dry saturated vapor at the end of compression the work done is given by? H2 – Enthalpy of vapor after compression H1 – Enthalpy of vapor before compression

A

H2 – H1

B

H2 + H1

C

H2 × H1

D

H2 ÷ H1

In vapor compression cycle having dry saturated vapor at the end of compression the refrigeration effect is given by? H1 – Enthalpy of vapor before compression H4 – Enthalpy of vapor before entering evaporator H2 – Enthalpy of vapor after compression

A

H1 – H4

B

H2 – H4

C

H1 × H4

D

H2 × H4

The blowby HC emissions are about 30% of the total HC emission from the engine.

A

True

B

False

Losses directly connected with the steam conditions while it is flowing through the turbine are called internal losses.

A

True

B

False

For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is p_a, then the intermediate pressure p₂ is given by

A

$${{\text{p}}_2} = \frac{{{{\text{p}}_1} + {{\text{p}}_3}}}{2}$$

B

$${{\text{p}}_2} = \sqrt {{{\text{p}}_1}{{\text{p}}_3}} $$

C

$${{\text{p}}_2} = {{\text{p}}_{\text{a}}} \times \frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}}$$

D

$${{\text{p}}_2} = {{\text{p}}_{\text{a}}}\sqrt {\frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}}} $$

Which of the following is not a method for providing effective lateral restraints? (i) by embedding compression flange inside slab concrete (ii) by providing shear connectors in compression flange (iii) by bracing compression flanges of adjacent beams

A

i only

B

i, iii

C

ii, iii

D

i, ii, iii

Blow by losses vary as the square root of inlet pressure, and increases as the compression ratio are ____________

A

increased

B

reduced

C

unpredictable

D

none of the mentioned

Highest useful compression ratio (HUCR) is the highest compression ratio at which the

A

Engine can run

B

Engine gives maximum output

C

Engine is most efficient

D

Fuel can be used in a test engine without knocking

If two series motors are identically coupled. One is running as motor while other as generator. For this combination, the iron losses and frictional losses are found identical for ____________

A

identical speed and excitation

B

identical speed

C

identical rating and construction

D

none of the mentioned

Blowby losses ____________ directly with compression ratio.

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