The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, $$l$$ = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Diameter of brake drum in meters and d = Diameter of rope in meters)
A. $${\text{B}}{\text{.P}}{\text{.}} = \frac{{{\text{W}}l \times 2\pi {\text{N}}}}{{60}}{\text{ watts}}$$
B. $${\text{B}}{\text{.P}}{\text{.}} = \frac{{\left( {{\text{W}} - {\text{S}}} \right)\pi {\text{DN}}}}{{60}}{\text{ watts}}$$
C. $${\text{B}}{\text{.P}}{\text{.}} = \frac{{\left( {{\text{W}} - {\text{S}}} \right)\pi \left( {{\text{D}} + {\text{d}}} \right){\text{N}}}}{{60}}{\text{ watts}}$$
D. All of these
Answer: Option D
Solution(By Examveda Team)
The brake power (B.P.) of the engine is given by- $${\text{B}}{\text{.P}}{\text{.}} = \frac{{{\text{W}}l \times 2\pi {\text{N}}}}{{60}}{\text{ watts}}$$
- $${\text{B}}{\text{.P}}{\text{.}} = \frac{{\left( {{\text{W}} - {\text{S}}} \right)\pi {\text{DN}}}}{{60}}{\text{ watts}}$$
- $${\text{B}}{\text{.P}}{\text{.}} = \frac{{\left( {{\text{W}} - {\text{S}}} \right)\pi \left( {{\text{D}} + {\text{d}}} \right){\text{N}}}}{{60}}{\text{ watts}}$$
Where W = Brake load or dead load in newtons, $$l$$ = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Diameter of brake drum in meters and d = Diameter of rope in meters.
This Question Belongs to Mechanical Engineering >> Internal Combustion Engines (I.C. Engines)
Engine pistons are usually made of aluminium alloy because it
A. Is lighter
B. Wear is less
C. Absorbs shocks
D. Is stronger
The reason for supercharging in any engine is to
A. Increase efficiency
B. Increase power
C. Reduce weight and bulk for a given output
D. Effect fuel economy
Morse test can be conducted for
A. Petrol engines
B. Diesel engines
C. Multi cylinder engines
D. All of these
The cetane (C16H34) which is a straight chain paraffin, is assigned a cetane number of
A. 0
B. 50
C. 100
D. 120
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