GATE 2022 ME: RAC, PPE & IC Engines Quiz - 9

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Question 1

Which of the following is not an effect of friction in steam nozzle?

• AReduction in the actual velocity at exit.
• BReduction in the actual enthalpy drop.
• CDecrease in dryness fraction.
• DEntropy increases.

Question 2

What is the critical pressure ratio for isentropic nozzle flow with ratio of specific heats as 1.5?

• A
• B
• C
• D

Question 3

At the stagnation point in nozzles

• Alocal velocity of fluid is zero
• Benthalpy is zero
• Cpressure is equal to atmospheric pressure
• Dtemperature is zero K

Question 4

The velocity of a gas flowing through a duct is 300 m/s; its temperature is 127 °, Gas constant R = 0.25 kj/kg K, the ratio of specific heat is C_p/C_v = = 1.6. What is the value of Mach number?

• A0.70
• B0.72
• C0.75
• D0.77

Question 5

Choked flow through an isentropic nozzle implies
1. Discharge is maximum
2. Discharge is zero
3. Nozzle exit pressure ≤ critical pressure
4. Mach number at the throat is unity
Which of the above statements are correct?

• A1, 2, 3 and 4
• B1, 2 and 3 only
• C1, 3 and 4 only
• D2, 3 and 4 only

Question 6

In an isentropic flow of air, the stagnation temperature is 500 K. If the value of Mach number of the flow is 3, then the temperature at that section in flow will be ___________.

• A200 K
• B300 K
• C180 K
• D280 K

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