Question: The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?

• 1. increase
• 2. decrease
• 3. remain unaffected
• 4. increase/decrease depending upon engine capacity

Question: In the case of compression ignition engine, the %age of CO in exhaust gases is________________?

• 1. Zero
• 2. 5-10%
• 3. Depends on load
• 4. Considerable percent

Question: A two stroke engine is usually identified by__________________?

• 1. size of flywheel
• 2. weight of engine
• 3. type of lubrication system
• 4. absence of valves

Question: A two stroke crank compressed engine has following ports in the cylinder_______________?

• 1. suction port and exhaust port
• 2. transfer port only
• 3. suction port and transfer port
• 4. suction port, exhaust port and transfer port

Question: Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________?

• 1. Supercharged
• 2. Not supercharged
• 3. Charged
• 4. Supercharged provided its speed is low

Question: In turbulence chamber in diesel engine__________________?

• 1. the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture
• 2. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
• 3. only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
• 4. there are no valves

Question: If petrol is used in a diesel engine, then______________?

• 1. higher knocking will occur
• 2. efficiency will be low
• 3. low power will be produced
• 4. black smoke will be produced

Question: Deposition of carbon in petrol engine cylinder would result in increase of__________________?

• 1. clearance volume
• 2. swept volume
• 3. compression ratio
• 4. volumetric efficiency

Question: The part load efficiency of a carburettor is,___________________?

• 1. Maximum
• 2. Optimum
• 3. Poor
• 4. Constant

Question: The basic requirement of a good combustion chamber is___________________?

• 1. high compression ratio
• 2. low compression ratio
• 3. low volumetric efficiency
• 4. high power output and high thermal efficiency