Ram compression in turbojet involves____________________?
(A) reduction of speed of incoming air and conversion of part of it into pressure energy
(B) compression of inlet air
(C) increasing speed of incoming air
(D) lost work
(D) leakage losses
The power available for take off and climb in case of turbojet engine as compared to reciprocating engine is ___________________?
(A) less
(B) more
(C) same
(D) may be less or more depending on ambient conditons
(D) unpredictable
Intercooling in gas turbine results in ____________________ ?
(A) increase in net output but decrease in thermal efficiency
(B) increase in thermal efficiency but decrease in net output
(C) increase in both thermal efficiency and net output
(D) decrease in both thermal efficiency and net output
(D) none of the above
If infinite number of heaters be used in a gas turbine, then expansion process in turbine approaches _________________?
(A) isothermal
(B) isentropic
(C) adiabatic
(D) isochoric
(D) isobaric
Turbo propeller has the following additional feature over the turbojet __________________?
(A) peopeller
(B) diffuser
(C) intercooler
(D) turbine and combustion chamber
(D) starting engine
The following property is most important for material used for gas turbine blade___________________?
(A) toughness
(B) fatigue
(C) creep
(D) corrosion resistance
(D) bulk modulus
Fighter bombers use following type of engine __________________?
(A) turbo-jet
(B) turbo-propeller
(C) rocket
(D) ram-jet ,
(D) pulsojet
The blades of gas turbine are made of_________________?
(A) mild steel
(B) stainless steel
(C) carbon steel
(D) high alloy seel
(D) high nicket alloy (neimonic)
The weight per horse power ratio for gas. turbine as compared to I.C. engine and steam turbine is________________?
(A) same
(B) higher
(C) lower
(D) uncomparable
(D) unpredictable
In jet propulsion power unit, the inlet duct of diverging shape is used in order to _______________ ?
(A) collect more air
(B) convert kinetic energy of air into pres-sure energy
(C) provide robust structure
(D) beautify the shape
(D) none of the above