MECHANICAL ENGINEERING MCQ SECTION 39

401. In a constant volume process, internal energy change is equal to

heat transferred

402. For an ideal gas, enthalpy becomes

h=u+RT

403. Enthalpy is an intensive property measured mostly in

kJ/kg.

404. Heat transferred at constant pressure increase the

enthalpy of a system.

405. internal energy of an ideal gas depends

only on the temperature.

406. Change in enthalpy of a system is due to heat supplied at

constant pressure.

407. When an irreversible process is taking place, there is

Increase of entropy.

408. A Carnot cycle is a

Ideal cycle

409. Second law of thermodynamics implies that cycle efficiency of thermodynamic process

must be less than unity.

410. For any irreversible process, net entropy change is

Positive.

411. A system in which there may exchange of energy but not mass that is called

Close System.

412. For thermodynamic constant pressure process, boundaries are

Movable.

413. Difference of specific heat capacity at constant pressure and specific heat capacity at constant volume is equal to

Gas Constant.

414. In an irreversible process, there is

loss of heat

415. Helium gas 'He' has molar mass of

4.0x10^-3kg/mol.

416. Mass of the Sun is

1.99x10³⁰kg.

417. Plane angle has a unit of

Radian.

418. The first law, also known as

Law of Conservation of Energy.

419. Law of Conservation of Energy,

states that energy cannot be created or destroyed in an isolated system.

420. The second law of thermodynamics states that the entropy of any isolated system

always increases.