Mean effective pressure of Otto cycle is

Does not depend upon pressure ratio

Inversely proportional to pressure ratio

Directly proportional to pressure ratio

Does not depend upon pressure ratio

Proportional to square root of pressure ratio

19 + Mcqs in Engine Performance Parameter in Mechanical Engineering Page 1 McqOptions

Explore topic-wise MCQs in Mechanical Engineering.

In an Otto cycle, air is compressed from 2.2 l to 0.26 l from an initial pressure of 1.2 kg/cm2. The net output/cycle is 440 kJ. What is the mean effective pressure of the cycle?

A four-cylinder four-stroke SI engine develops an output of 44 kW. If the pumping work is 5% of the indicated work and mechanical loss is an additional 7%, then the power consumed in pumping work is:

During an experiment on a 4-stroke SI engine, it was observed that the maximum and minimum pressure inside the cylinder during each working cycle was 5 bar and 200 bar respectively. If the compression ratio was 8, then the mean effective pressure is approximately:

A transmission dynamometer measures

A reversible heat engine, operation on Carnot cycle, between the temperature limits of 300 K and 1000 K produces 14 kW of power. If the calorific value of the fuel is 40,000 kJ/kg. The fuel consumption will be:

A spark ignition engine has a compression ratio of 8 and the volume before compression is 0.9 m3/kg. Net heat interaction per cycle is 1575 kJ/kg. What is the mean effective pressure?

A fictitious pressure that, if it acted on the piston during the entire power stroke, would produce the same amount of net work as that produced during the actual cycle is called

A diesel engine develops a Brake power of 4.5 kW. Its indicated thermal efficiency is 30% and the mechanical efficiency is 85%. Considering calorific value of the fuel as 40000 kJ/kg, the fuel consumption will be

Consider the following statements regarding C.I. engine:1. C.I. engines are more bulky than S.I. engines2. C.I. engines are more efficient than S.I. engines3. Lighter flywheels are required in C.I. enginesWhich of the above statements are correct?

Diesel engine having brake thermal efficiency of 30% and the calorific value of fuel used is 10000 kcal/kg, the brake specific fuel consumption will be

Mean effective pressure of Otto cycle is

A single cylinder four stroke engine operating at 80% of mechanical efficiency develops a brake power of 60 kW. The indicated power and the power lost due to friction respectively are

A single cylinder, 4-stroke cycle engine is fitted with a rope brake. The diameter of the brake wheel is 600 mm and the rope diameter is 26 mm. The dead weight on the brake is 200 N and the spring balance reads 30 N. If the engine runs at 450 rpm, what will be the brake power of the engine?

A two-stroke IC engine has a stroke length of 120 mm and a cylinder diameter 80 mm. Its mean effective pressure is 4 x105 N/m2 and the crankshaft speed is 1500 r.p.m. What is its indicated power (in kW)?

An I.C. engine develops indicated power of 150 kW. If the mechanical efficiency of the engine is 80%, then brake power delivered is

A four-stroke engine having a brake power of 105 kW is supplied with fuel at the rate of 4.4 kg per 10 minutes. The brake specific fuel consumption of the engine is

1. Fuels of higher octane number can be employed at higher compression ratio2. In CI engines, brake specific fuel consumption decreases with increasing loadWhich of the above statements is/are correct?

A large diesel engine runs on a 4-stroke cycle at 2000 rpm. The engine has a displacement of 25 litre and a brake mean effective pressure of 0.6 MN/m2. It consumes 0.018 kg/s of fuel (calorific value = 42000 kJ/Kg). Determined the brake power.