A gasoline engine working on Otto cycle consumes 8 litres of gasoline per hour and develops 28 kW. The specific gravity of gasoline. is 0.75 and its calorific value is 44000 kJ/kg. The indicated thermal efficiency of the engine is
In a variable speed SI engine, the maximum torque occurs at the maximum
In an SI engine very high compression ratio cannot be used because
The method of determination of indicated power of multi-cylinder SI engine is by the use of
In the context of performance evaluation of IC Engine, match List-I (Parameter) with List-II (Equipment of measurement) and select the correct answer using the codes given below the lists:
List-I
A. Brake power (BHP)
B. Engine speed
C. Calorific value of fuel
D. Exhaust emission
List-II
1. Bomb calorimeter
2. Electrical tachometer
3. Hydraulic dynamometer
4. Flame ionization detector
Codes:
A B C D
(a) 3 1 2 2
(b) 4 2 1 3
(c) 3 2 1 4
(d) 2 3 1 5
During a Morse test on a 4-cylinder engine, the following measurements of brake power were taken at constant speed.
All cylinders firing : 3037 kW
Number 1 cylinder not firing : 2102 kW
Number 2 cylinder not firing : 2102 kW
Number 3 cylinder not firing : 2100 kW
Number 4 cylinder not firing : 2098 kW
Q. The mechanical efficiency of the engine is
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