- (A) if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
- (B) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
- (C) if a polygon representing forces acting at a point is closed then forces are in equilibrium
- (D) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
- (E) none of the above.
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- (A) one point
- (B) two points
- (C) plane
- (D) perpendicular planes
- (E) different planes
- (A) newton
- (B) pascal
- (C) kilogram meter
- (D) watt
- (E) joule
- (A) Th232andU238
- (B) U233andPu239
- (C) U233andPu238
- (D) non oh these
- (A) centrifugal compressors deliver prac-tically constant pressure over a considerable range of capacities
- (B) Axial flow compressors have a sub-stantially constant delivery at variable pressures
- (C) centrifugal compressors have a wider stable operating range than axial flow compressors
- (D) axial flow compressors are bigger in diameter compared to centrifugal type
- (E) axial flow compressors apt to be longer as compared to centrifugal type
- (A) gas turbine uses low air-fuel ratio to economise on fuel
- (B) gas turhine uses high air-fuel ratio to reduce outgoing temperature
- (C) gas turbine uses low air-fuel ratio to develop the high thrust required
- (D) all of the above
- (E) none of the above
- (A) large gas turbines employ axial flow compressors
- (B) axial flow compressors are more stable than centrifugal type compressors but not as efficient
- (C) axial flow compressors have high capacity and efficiency
- (D) axial flow compressors have instability region of operation
- (E) centrifugal compressors are used mainly on low flow pressure ratio gas turbines
- (A) gas turbine requires lot of cooling water
- (B) gas turbine is capable of rapid start up and loading
- (C) gas turbines have flat efficiency at part loads
- (D) gas turbines have high standby losses and require lot of maintenance
- (E) gas turbines can be used to generate power only
- (A) large gas turbines use radial inflow turbines
- (B) gas turbines have their blades similar to steam turbine
- (C) gas .turbine’s blade will appear as impulse section at the hub and as a reaction section at tip
- (D) gas turbines use both air and liquid cooling
- (E) all of the above are correct.
- (A) pulsojet requires no ambient air for propulsion
- (B) ramjet-engine has no turbine
- (C) turbine drives compressor in a burbojet
- (D) bypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy
- (E) propeller is an indirect reaction device
