88.

89.

90.

91.

92.

93.

94.

The theoretically correct air — fuel ratio for most effective combustion in petrol engine is :
(A) 14.7: 1 by weight ൯) 14.7: 1 by volume
(0) 15.7: 1 by weight ൯൩) 15.7: 1 by volume

Which among the following is not a part of C.R.D.I system?
(A) Cooling water Temperature Sensor ൯) Inlet Air Temperature Sensor

(C) Accelerator Pedal Sensor (D) Throttle Position sensor

Which among the following are Boiler Accessories?
டு Steam trap

(1) Fusible Plug

Gii) Water Level Indicator

(iv) Pressure Reducing Valve

(A) @ and (iv) (B) (i) and (ii)
(C) (0) ೩೧6 (1) (D) (ii) and (iv)
Heat transfer takes place according to ‏لل عط[‎ law of thermodynamics.
(^) First (B) Second
(C) Third () Zeroth

Transfer of heat in liquids and gases is essentially due to :
(A) Convection (B) Conduction
(C) Radiation (D) Both (A) and (B)

According to Fouriers’s law of heat conduction the heat flow (Q) is given by, when the area
of flow (A), temperature difference in face (dt), thickness of body (dx) and thermal
conductivity (K) :

(A) Q=—K (dt/dx) ൫ ९ = ^ (५४)
(0 Q=—KA @t/dx) (0) Q=-—KA (dx/dt)

The emissive power of black body per unit area per unit time varies :
(A) Directly with the absolute temperature
(B) Directly with square of absolute temperature
(C) Directly with third power of absolute temperature
(D) Directly with fourth power of absolute temperature

17 227/2028
[P.T.0.]