This set of Automobile Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Heat Engines”.
1. A heat engine converts heat energy from fuel combustion or any other source into which type of work?
a) Electrical work
b) Mechanical work
c) Pressure work
d) None of the mentioned
View Answer
Explanation: A heat engine gives mechanical work as output. In a heat engine, input is given in the form of heat and this heat is converted into mechanical work. The remaining heat which is not converted into work is exhausted.
2. A steam engine comes under the category of ________
a) External combustion engines
b) Internal combustion engines
c) All of the mentioned
d) None of the mentioned
View Answer
Explanation: A steam engine is an External combustion engine. Steam engine is a type of heat engine in which heat is used as an input and this heat is converted into mechanical work. Steam pushes the piston and reciprocating motion of the piston is converted into rotary motion.
3. Which of these is a power absorbing heat engine?
a) Steam engine
b) Petrol engine
c) Air compressor
d) None of the mentioned
View Answer
Explanation: An air compressor is a power absorbing heat engine.
4. Which of these is a type of reciprocating steam engine?
a) Simple
b) Compound
c) Uniflow
d) All of the mentioned
View Answer
Explanation: Simple, compound and uniflow are types of reciprocating steam engine.
5. A gas undergoes step 2 in Carnot cycle. Which of these processes describes the 2nd step?
a) Isentropic expansion
b) Isentropic compression
c) Isothermal expansion
d) Isothermal compression
View Answer
Explanation: The 2nd process in carnot cycle is isentropic expansion.
6. A gas undergoes step 4 in Carnot cycle. Which of these processes describes the 2nd step?
a) Isentropic expansion
b) Isentropic compression
c) Isothermal expansion
d) Isothermal compression
View Answer
Explanation: The 4th process in carnot cycle is isentropic compression.
7. A gas undergoes isothermal compression in Carnot cycle. Which step does it undergo?
a) 1st
b) 2nd
c) 3rd
d) 4th
View Answer
Explanation: Isothermal compression is the 3rd step in Carnot cycle.
8. Thermal power plants operate on which of these cycles?
a) Otto cycle
b) Rankine cycle
c) Carnot cycle
d) Stirling cycle
View Answer
Explanation: Thermal power plants operate on Rankine cycle.
9. The efficiency of a combined cycle gas turbine(steam cooled) can range as high as ________
a) 20%
b) 30%
c) 40%
d) 60%
View Answer
Explanation: A steam cooled combined cycle gas turbine can have efficiency as high as 60%.
10. One ‘ton of refrigeration’ equals how much Btu/hr.
a) 14,500 Btu/hr
b) 12,000 Btu/hr
c) 13,000 Btu/hr
d) 15,000 Btu/hr
View Answer
Explanation: One “ton of refrigeration (TR or TOR)” is equivalent to 12,000 Btu/hr or 3.5 kW. It is the unit of power which is used to describe the heat extraction capacity of a refrigeration or air conditioning equipment.
Sanfoundry Global Education & Learning Series – Automobile Engineering.
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