Maximum: 100 marks
Time: 1 hour and 15 minutes
1. For a viscous flow, the relation between the coefficient of friction f and Reynolds number Re is:
(A) f=64/Re
(B) f=16/Re
(C) f=8/Re
(D) f=4/Re
2. For flow through pipes, the maximum transmission efficiency that can achieve is:
(A) 100%
(B) 50%
(C) 40%
(D) 67%
3. The unit of Chezy's constant C in the Chezy's formula is:
(A) None (C) m/s2
(B) m/s (D) m2/s
4. The ratio of the pitch diameter of Pelton wheel to the diameter of the jet is called:
(A) Jet ratio
(B) Speed ratio
(C) Wheel ratio
(D)None of the above
5. The hydraulic efficiency of a turbine with mean bucket diameter 1 m and running at 1000 rpm with net head 700 m when the side clearance angle is 15 degree and discharge of 100 liters/s is:
(A)60%
(C) 85%
(B) 70%
(D) 97%
6.The specific speed of a Francis turbine which develops 7225 kW power under a head of 25 meters at 135 r.p.m is:
(A) 150 (B) 180 (C) 195 (D) 205
7. The head loss due to friction for the flow of water through penstocks can be minimized by :
(A) Decreasing the diameter of penstock
(B) Increasing the length of penstock
(C) Increasing the velocity of flow
(D) Increasing the diameter of penstock
8. The head against which the centrifugal pump has to work is called:
(A) Static head
(B) Suction head
(C) Delivery head
(D) Manometric head
9. An example of a turbine with high head and low specific speed is:
(A) Kaplan
(B) Francis
(C) Pelton
(D) None
10. The slip of a single acting reciprocating pump, running at 50 rpm, delivers 100 liters/s when- the diameter of piston and stroke length are 200 mm and 400 mm respectively is:
(A) 0.47 m/sec
(C) 0.00047 m3/s
(B) 0.047 m/sec
(D) 4.7 m3/s
11. In the Van der Wall's equation (p+(a/v)) (v-b) = RT the unit of constant a is:
(A) Nm2
(B) Nm
(C) N/m
(D) None
12. Which parameter remains constant during Joule-Thomson expansion?
(A) Temperature
(B) Pressure
(C) Enthalpy
(D) Volume
13. For an ideal gas the compressibility factor is:
(A) Zero
(B) Unity
(C) Infinity.
(D) None
14. A heat pump works on reversed Carnot cycle has a COP of 5. If it works as a refrigerator taking 1 kW of work input, the refrigerator effect will be:
(A) 1kW
(B) 2 kW
(C) 3 kW
(D) 4 kW
15. The value of Universal gas constant is:
(A) 8.314 J/kgK
(B) 83.14 kJ/kgK
(C) 8.314 kJ/kgK
(D) None
16. Which one of the following is the extensive property of the system?
(A) Volume
(B) Pressure
(C) Temperature
(D) Density