24,

28,

27,

28.

31.

32.

Volumetric efficiency of a reciprocating compressor increases with :
1. Increase in clearance ratio
2. Decrease in delivery pressure
3, Multistaging
Which of the statements given above are correct?

(A) 387362 (B) 2and3
(0) 3Bonly D) 1,2and3
For perfectly elastic bodies, the value of coefficient of restitution is :
@ 1 (ए) 0.50 1
(C) 0to0.5 (D) Zero
A screw thread 18 defined by its :
(ക) Root diameter (8) Core diameter
(C) Pitch diameter (D) Crest diameter
The gas with highest value of adiabatic index is :
(¢) Helium (B) Nitrogen
(C) Oxygen (D) Methane

The use of regenerator in a gas turbine cycle increases :
(ಸ) Efficiency but has no effect on output (B) Output but has no effect on efficiency
(C) Both efficiency and output (D) Efficiency but decreases output

The moment of inertia of a uniform rod of mass m and length [ about an axis through its
centre and perpendicular to the length of rod is :

(ಯ) ‏به‎ (8) 8

~ (©) ೫೫/12 (D) "18
A key connecting a flange coupling to a shaft is likely to fail in :
(4) ண (ए) Tension
(©) Torsion () Bending

If the thermal efficiency of a carnot engine is 40%, then coefficient of performance of a
refrigerator working within the same temperature limits is

(ക) 0.5 (8) 1.0

(0 15 (D) 45
Propulsion efficiency of a jet engine is given by :

(മ 2Va/(Vj-Va) B) (Vi+Va)/2Va

0 2Va/(Vi+Va) D) (Vi-Va)/2Va

‘Where Vj and Va are jet velocity and flight velocity relative to aireraft?

176/2015 ‏8ھ‎ A