I C Engines and Neclear Power Plants

1

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 metres, N = Speed of engine in r.p.m., S - Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)

A. `B.P. = (W.l xx 2 pi N)/(60) ` watts
B. `B.P. = ((W - S) pi D N)/(60)` watts
C. `B.P. = ((W - S) pi (D +d )N)/(60)` watts
D. all of these

2

The air standard efficiency ofan I.C. engine is given by (where r = Compression ratio, and Y = Ratio of specific heats)

A. `1 - r^(Y - 1)`
B. `1 + r^(Y - 1)`
C. `1 - 1/r^(Y - 1)`
D. none of these

3

The mechanical efficiency (ηm) of the engine is given by

A. `eta_m = (B.P.)/(l.P)`
B. `eta_m = (l.P.)/(B.P)`
C. `eta_m = (B.P xx l.P)/(100)`
D. none of these

4

If V1 is the jet velocity and V0 is the vehicle velocity, then the propulsive efficiency of a rocket is given by

A. `(2(V_0//V_1))/(1+ (V_0//V_1)^2)`
B. `((V_0//V_1))/(1+ (V_0//V_1)^2)`
C. `(V_0)/(V_0 +V_1)`
D. `(V_1)/(V_0 +V_1)`

5

If V1 is the jet velocity and V0 is the vehicle velocity, then propulsive efficiency of a turbo-jet engine is

A. `(V_1)/(V_0 + V_1)`
B. `(V_0)/(V_0 + V_1)`
C. `(2V_0)/(V_0 + V_1)`
D. `(2V_1)/(V_0 + V_1)`