1. In a heat engine cycle, which of the following process occurs?
a) heat is transferred from furnace to boiler
b) work is produced in turbine rotor
c) steam is condensed in condenser
d) all of the mentioned
Explanation: These are the basic processes occurring in a heat engine cycle comprising of furnace, boiler condenser and a turbine.
2. The function of a heat engine cycle is to _____ continuously at the expense of _____ to the system..
a) heat input, produce work
b) produce work, heat input
c) can be both of the mentioned
d) none of the mentioned
Explanation: Net work and heat input are of primary interest in a cycle.
3. Efficiency of a heat engine is defined as.
a) total heat output / net work input
b) total heat input / net work output
c) net work output / total heat input
d) net work input / total heat output
Explanation: Basic definition of efficiency.
4. A thermal energy reservoir is a large body of
a) small heat capacity
b) large heat capacity
c) infinite heat capacity
d) none of the mentioned
Explanation: Basic fact about TER.
5. Processes inside a thermal energy reservoir are quasi-static.
a) true
b) false
Explanation:The changes taking place in TER are very slow and minute.
6. A TER which transfers heat to system is called ____ and one which receives heat is called ____
a) source, sink
b) sink, source
c) sink, sink
d) source, source
Explanation: A source transfers heat while a sink receives heat.
7. Which if the following statements are true for a mechanical energy reservoir(MER)?
a) it is a large body enclosed by an adiabatic impermeable wall
b) stores work as KE or PE
c) all processes within an MER are quasi-static
d) all of the mentioned
Explanation: These are some important features of an MER.
8. According to Kelvin-Planck statement, it is ____ for a heat engine to produce net work in a complete cycle if it exchanges heat only with bodies at ____
a) impossible, single fixed temperature
b) possible, changing temperature
c) impossible, changing temperature
d) possible, single fixed temperature
Explanation: This is the basic definition of Kelvin-Planck statement
9. If heat rejected from the system Q2 is zero, then
a) net work=Q1 and efficiency=1.00
b) heat is exchanged only with one reservoir
c) it violates the Kelvin-Planck statement
d) all of the mentioned
Explanation: Such a heat engine is called a perpetual motion machine of the second kind(PMM2).
10. A PMM2 is possible.
a) true
b) false
Explanation: A PMM2 is impossible because it violates the Kelvin-Planck statement