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A jet engine works on the principle of conservation of

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Important Questions on Physics

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General Awareness>General Science>Physics>Heat and Thermodynamics

A reversible engine has an efficiency of

\frac{1}{4} .

If the temperature of the sink is reduced by

58 ° C,

its efficiency becomes double. Calculate the temperature of the sink:

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General Awareness>General Science>Physics>Heat and Thermodynamics

A Carnot's engine working between

400 K

and

800 K

has a work output of

1200 J

per cycle. The amount of heat energy supplied to the engine from the source in each cycle is:

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General Awareness>General Science>Physics>Heat and Thermodynamics

A heat engine has an efficiency of

\frac{1}{6}

. When the temperature of sink is reduced by

62 ° C

, its efficiency get doubled. The temperature of the source is :

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General Awareness>General Science>Physics>Heat and Thermodynamics

Explain the working of a diesel engine.

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General Awareness>General Science>Physics>Heat and Thermodynamics

Consider an engine that absorbs

130 cal

of heat from a hot reservoir and delivers

30 cal

heat to a cold reservoir in each cycle. The engine also consumes

2 J

energy in each cycle to overcome friction. If the engine works at

90

cycles per minute, what will be the maximum power delivered to the load? [Assume the thermal equivalent of heat is

4.2 J / cal

]

EASY

General Awareness>General Science>Physics>Heat and Thermodynamics

Steam engine cannot be started instantaneously because,

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General Awareness>General Science>Physics>Heat and Thermodynamics

For an ideal heat engine, the temperature of the source is

127 ° C

. In order to have

60 %

efficiency the temperature of the sink should be __________

{}^{\circ}C

. (Round off to the nearest integer)

EASY

General Awareness>General Science>Physics>Heat and Thermodynamics

_____ expansion makes the Eiffel Tower taller during summers.

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General Awareness>General Science>Physics>Heat and Thermodynamics

A carnot engine working between

27 ° C

and

127 ° C,

draws

600 J

of heat from the reservoir in one cycle. The work done by the engine

HARD

General Awareness>General Science>Physics>Heat and Thermodynamics

The efficiency of the cycle shown below in the figure (consisting of one isobar, one adiabat and one isotherm) is $50 % .$ The ratio, $x,$ between the highest and lowest temperatures attained in this cycle obeys (the working substance is a ideal gas):-

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General Awareness>General Science>Physics>Heat and Thermodynamics

Explain intake stroke and compression stroke in the working of a petrol engine.

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General Awareness>General Science>Physics>Heat and Thermodynamics

A heat engine is involved with exchange of heat of

1915 J, - 40 J, + 125 J

and

- Q J

, during one cycle achieving and efficiency of

50.0 %

. The value of

Q

is:

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General Awareness>General Science>Physics>Heat and Thermodynamics

A heat engine operates with the cold reservoir at temperature

324 K

. The minimum temperature of the hot reservoir, if the heat engine takes

300 J

heat from the hot reservoir and delivers

180 J

heat to the cold reservoir per cycle, is _____

K

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General Awareness>General Science>Physics>Heat and Thermodynamics

A heat engine operates between a cold reservoir at temperature

T_{2} = 400 K

and a hot reservoir at temperature

T_{1}

. It takes

300 J

of heat from the hot reservoir and delivers

240 J

of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be

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General Awareness>General Science>Physics>Heat and Thermodynamics

The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

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General Awareness>General Science>Physics>Heat and Thermodynamics

In a group of boys,

25

play volleyball,

20

play badminton and

10

boys play cricket. Five boys play all the three games. 8 boys play atleast two of the three games. How many of them play only one game?

HARD

General Awareness>General Science>Physics>Heat and Thermodynamics

In an examination

51 %

students fail in English and

45 %

fail in Maths. If

21 %

students fail in both the subjects, then

169

students pass the examination. What is the total number of students taking the exam?

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General Awareness>General Science>Physics>Heat and Thermodynamics

A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by

52 K,

its efficiency is doubled. The temperature in Kelvin of the source will be ___ .

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General Awareness>General Science>Physics>Heat and Thermodynamics

An engine operates by taking a monatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close to

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General Awareness>General Science>Physics>Heat and Thermodynamics

A Carnot engine operates between two reservoirs of temperatures

900 K

and

300 K

. The engine performs

1200 J

of work per cycle. The heat energy (in

J

) delivered by the engine to the low temperature reservoir, in a cycle, is _____________

A jet engine works on the principle of conservation of

Important Questions on Physics

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