Q1:

Isotopes of some element

Q2:

In forced circulation boilers, about 80 % of water is recirculated without evaporation. The circulation ratio is

Q3:

Fission of one atom of uranium-235 result in the release of energy which is (in Mev)

Q4:

Heavy water in nuclear reactor serves as

Q5:

Which of the following statements is/are TRUE?

1. Most commonly used moderator in  nuclear power plant is Heavy water.

2. Moderator is used to slow down the neutron from high kinetic energy in fraction of seconds.

3. Moderator increases the probability of reaction & mountain the chain reaction.

Q6:

Which one of the following is not a moderator

Q7:

Shielding prevents us from

Q8:

Material used to conserve neutrons in nuclear reactor is called

Q9:

Which of the following statement is/are TRUE?

1. Control rods absorbs neutron.

2. Coolant removes excess heat. 

3. Concrete is used as shield material.

4. Boron is used as control rod.

Q10:

Which of the following statement is/are TRUE about nuclear unit becoming critical

1. It is generating power to rated capacity.

2. Neutron population in the reactor is maintained constant.

3. There is a danger of nuclear spread.

4. Rapidly increasing leading to the point of explosion. 

Q11:

Uranium 238 as represented in ${}_{92}{U}^{238}$ imply

Q12:

The efficiency of a simple gas turbine can be improved by using a regenerator, because the

Q13:

Consider the following statements relating to a closed gas turbine cycle.

1. The cycle can employ mono atomic gas like helium instead of air to increase the cycle efficiency if other conditions are the same

2. The efficiency of heat exchanger increase with the use helium.

3. The turbine blades suffer higher corrosion damages.

4. Higher output can be obtained for the same size.

Which of these statements are correct?

Q14:

An aircraft flying horizontally at a speed of 300 km/h is propelled by a jet leaving the nozzle at a speed of 500 m/s. The propulsive efficiency is

Q15:

Reheating in a gas turbine

Q16:

A gas turbine works on which one of the following cycles?

Q17:

The effective jet exit velocity from a rocket is 2700 m/s. The forward flight velocity is 1350 m/s. The propulsive efficiency of the unit is

Q18:

Consider the following statements:

In a turbo-jet engine, thrust may be increased by

1. Increasing the jet velocity

2. Increasing the mass flow rate of air

3. After burning of the fuel.

Which of these statements are correct?

Q19:

Consider the following statements:

The thrust of rocket engine depends upon

1. Effective jet velocity.

2. Weight of the rocket.

3. Rate of propellant consumption.

Which of these statements are correct?

Q20:

Which one of the following is the correct sequence of the position of the given components in a Turbo- prop?

Q21:

In a gas turbine cycle, the turbine output is 600 kJ/kg, the compressor work is 400 kJ/kg and the heat supplied is 1000 kJ/kg. The thermal efficiency of this cycle is:

Q22:

A gas turbine develops 120 kJ of work while the compressor absorbed 60 kJ of work and the heat supplied is 200 kJ. If a regenerator which would recover 40% of the heat in the exhaust were used, then the increase in the overall thermal efficiency would be:

Q23:

In a single stage open cycle gas turbine, the mass flow through the turbine is higher than the mass flow through compressor, because

Q24:

The optimum intermediate pressure p₁ for a gas turbine plant operating between pressure limits p₁ and p₂ with perfect undercooling between the two stages of compression (with identical isentropic efficiency) is given by

Q25:

In a turbo-jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Q26:

Consider the following statements relating to rocket engines:

1. The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel.

2. Stagnation condition exit at the combustion chamber.

3. The exit velocities of exhaust gases are much higher than in jet engines.

4. Efficiency of rocket engines is higher than that of jet engines.

Which of these statements correct?

Q27:

Consider the following statements:

In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning more fuel is used to increase

1. Thrust.

2. The efficiency of engine.

3. The range of aircraft.

Which of these statements are correct?

Q28:

Only rocket engines cab be propelled to space because

Q29:

At which location of a converging diverging nozzle, does the shock boundary layer interaction take place

Q30:

Propulsion efficiency of a jet engine is given by (where u is flight velocity Vis jet velocity relative to aircraft).