Compressors, Gas Turbines and Jet Engines In a centrifugal compressor, an increase in speed at a given pressure ratio causes Increase in efficiency Decrease in flow Increase in flow Increase in flow and decrease in efficiency Increase in efficiency Decrease in flow Increase in flow Increase in flow and decrease in efficiency ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines The maximum propulsion efficiency of a turbojet is attained at around following speed 1700 km/hr 2400 km/hr 550 km/hr 1050 km/hr 1700 km/hr 2400 km/hr 550 km/hr 1050 km/hr ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines For supplying intermittent small quantity of air at high pressure, following compressor is best suited Centrifugal Reciprocating Axial Screw Centrifugal Reciprocating Axial Screw ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines In jet engines, paraffin is usually used as the fuel because of its Both (A) and (C) above Ease of atomisation Low freezing point High calorific value Both (A) and (C) above Ease of atomisation Low freezing point High calorific value ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines To avoid moisture troubles, the compressed air main line should Rise gradually towards the point of use Drop gradually towards the point of use Be laid exactly horizontally Be laid vertically Rise gradually towards the point of use Drop gradually towards the point of use Be laid exactly horizontally Be laid vertically ANSWER DOWNLOAD EXAMIANS APP
Compressors, Gas Turbines and Jet Engines In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by W₁/W₂ = n₁/n₂ W₁/W₂ = n₂/n₁ W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1) W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1) W₁/W₂ = n₁/n₂ W₁/W₂ = n₂/n₁ W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1) W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1) ANSWER DOWNLOAD EXAMIANS APP
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