Mechanical Engineering MCQs

WhiCh of the following statements is correct ?
D. None of these

A. Prevents thermal interaction
B. Permits thermal interaction
C. Encourages thermal interaction
D. Discourages thermal interaction

A. Justified
B. Not possible
C. May be possible with lot of sophistications
D. Cost will be very high

A. 650°k
B. 600°k
C. 625°k
D. 700°k

A. Properties of the medium/substance used
B. Condition of engine
C. Working condition
D. Temperature range of operation

A. Process is thermodynamically in equilibrium
B. Process is executed in closed system cycle
C. Its entropy will change due to irreversibility
D. Sum of heat and work transfer will be zero

A. Reversible engine
B. Irreversible engine
C. New engine
D. Petrol engine

A. enables to determine change in internal energy of the system
B. does not help to predict whether the system will or not undergo a change
C. does not enable to determine change in entropy
D. provides relationship between heat, work and internal energy

A. Mass and energy are mutually convertible
B. Carnot engine is most efficient
C. Heat and work are mutually convertible
D. Mass and light are mutually convertible

A. Increases
B. Decreases
C. Remains constant
D. First increases and then decreases