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Q1. | A diathermy wall is one which |

A. | prevents thermal interaction [Wrong Answer] |

B. | permits thermal interaction [Correct Answer] |

C. | encourages thermal interaction [Wrong Answer] |

D. | discourages thermal interaction [Wrong Answer] |

E. | does not exist. [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ When the expansion or compression takes place according to the law

*pv*=

^{n}*C*, the process is known as.

isothermal process

adiabatic process

hyperbolic process

polytropic process

⇒ One kg of carbon produces __________ kg of carbon dioxide.

3/7

7/3

11/3

3/11

⇒ Which law states that the specific heat of a gas remains constant at all temperatures and pressures

Charles' Law

Joule's Law

Regnault's Law

Boyle's Law

⇒ The heat energy stored in the gas and used for raising the temperature of the gas is known as.

external energy

internal energy

kinetic energy

molecular energy

⇒ The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

a temperature of - 273.16°C

a temperature of 0°C

a temperature of 273 °K

a negative pressure and 0°C temperature

⇒ Diesel cycle consists of following four processes

two isothermals and two isentropics

two isentropics, and two constant volumes.

two isentropics, one constant volume and one constant pressure

two isentropics and two constant pressures

⇒ One watt is equal to

1 Nm/s

1 N/mt

1 Nm/hr

1 kNm/hr

⇒ Which of the following is the correct statement?

All the reversible engines have the same efficiency.

All the reversible and irreversible engines have the same efficiency.

Irreversible engines have maximum efficiency.

All engines are designed as reversible in order to obtain maximum efficiency.

⇒ The efficiency and work ratio of a simple gas turbine cycle are.

low

very low

high

very high

⇒ Stirling and Ericsson cycles are

reversible cycles

irreversible cycles

quasi-static cycles

semi-reversible cycles

⇒ In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about

100 xlOO5 joules

lxlO5 joules

10 xlO5 joules

10 xlO5 kilo joules

⇒ An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is

feasible

impossible

possible

possible, but with lot of sophistication

⇒ One Joule (J) is equal to.

1 N-m

1 kN-m

10 N-m/s

10 kN-m/s

⇒ The ratio of specific heat at constant pressure (

*c*) and specific heat at constant volume (

_{p}*c*) is always __________ one.

_{v}equal to

less than

greater than

none of these.

⇒ The general gas energy equation is (where

*Q*

_{1 - 2}= Heat supplied,

*dU*= Change in internal energy, and

*W*

_{1 - 2}= Work done in heat units)

Q1 - 2 = dU + W1 - 2

Q1 - 2 = dU - W1 - 2

Q1 - 2 = dU/W1 - 2

Q1 - 2 = dU x W1 - 2

⇒ Select the wrong statement.

A Joule cycle consists of two constant volume and two isentropic processes.

An Otto cycle consists of two constant volume and two isentropic processes.

An Ericsson cycle consists of two constant pressure and two isothermal processes.

all of the above

⇒ If value of n is infinitely large in a poly tropic process pV" = C, then the process is known as constant

volume

pressure

temperature

enthalpy

⇒ Which of the following has the highest calorific value?

Peat

Lignite

Bituminous coal

Anthracite coal

⇒ For reversible adiabatic process, change in entropy is

maximum

minimum

zero

unpredictable

⇒ Brayton cycle consists of following four processes

two isothermals and two isentropics

two isentropics and two constant volumes

two isentropics, one constant volume and one constant pressure

two isentropics and two constant pressures

⇒ The value of one bar (in S. I. units) is equal to.

1 x 102 N/m2

1 x 103 N/m2

1 x 104 N/m2

1 x 105 N/m2

⇒ Which of the following is a reversible non-flow process?

Isochoric process

Isobaric process

Hyperbolic process

all of these

⇒ On volume basis, air contains following parts of oxygen

21

23

25

77

⇒ The unit of time in S.I. units is

second

minute

hour

day

⇒ The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is

29.27 J/kmol°K

83.14J/kmol°K

848J/kmol°K

All J/kmol °K

⇒ Kerosene is distilled at.

65Â° to 220Â°C

220Â° to 345Â°C

345Â° to 470Â°C

470Â° to 550Â°C

⇒ A definite area or a space where some thermodynamic process takes place is known as.

thermodynamic system

thermodynamic cycle

thermodynamic process

thermodynamic law

⇒ If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly

temperature

enthalpy

internal energy

entropy

⇒ Otto cycle is also known as.

constant pressure cycle

constant volume cycle

constant temperature cycle

constant temperature and pressure cycle

⇒ Specific heat of air at constant pressure is equal to

0.17

0.21

0.24

1.0