Previous Years GATE MCQ’s on Hydraulic Machines

June 4, 2015

By Amit Thakur

Solved GATE Questions on Hydraulic Machines

Question 1. Match the following

P. Curtis 1. Reaction steam turbine

Q. Rateau 2. Gas turbine

R. Kaplan 3. Velocity compounding

S. Francis 4. Pressure compounding

5. Impulse water turbine

6. Axial turbine

7. Mixed flow turbine

8. Centrifugal pump

(A) P-2, Q-1, R-7, S-6

(B) P-3, Q-1, R-5, S-7

(C) P-1, Q-3, R-1, S-5

(D) P-3, Q-4, R-7, S-6

GATE-ME-2003

Question 2. A centrifugal pump running at 500 rpm and its maximum efficiency is delivering a head of 30 m at flow rate of 60 litre PER minutes. If the rpm is changed to 1000, then the head H in metres and flow rate Qin litresper minute at maximum efficiency are estimated to be

(A) H=60, Q=120

(B) H=120, Q=120

(C) H= 60, Q=4800

(D) H= 120, Q=30

GATE-ME-2003

Question 3. Match the following

P-Reciprocating pump 1. Plant with power output below 100 kW

Q-Axial flow pump 2. Plant with power output between 100 kW to 1 MW

R-Microhydel plant 3. Positive displacement

S-Backward curved vanes 4. Draft tube

5. High flow rate, low pressure ratio

6. Centrifugal pump impeller

(A)v P-3, Q-5, R-6, S-2

(B) P-3, Q-5, R-2, S-6

(C) P-3, Q-5, R-1, S-6

(D) P-4, Q-5, R-1, S-6

GATE-ME-2004

Question 4. At hydroelectric power site, available head and flow rate are 24.5 m and 10.1 respectively. If the turbine to be installed is required to run at 4.0 revolution per second (rps) with an overall efficiency 90%, then suitable type of turbine for the site is

(A) Francis

(B) Kaplan

(C) Pelton

(D) Propeller

GATE-ME-2004

Question 5. A centrifugal pump is required to pump water to an OPEN water tank situated 4 km away from the location of the pump through a pipe diameter 0.2 m having Darcy friction factor of 0.01. The average speed of water in the pipe is 2 m/s. If it is to maintain a constant head of 5m in the tank, neglecting other minor losses, then absolute discharge pressure at the pump exit is

(A) 0.449 bar

(B) 5.503 bar

(C) 44.911 bar

(D) 55.203 bar

GATE-ME-2004

Question 6. A horizontal shaft centrifugal pump lifts water at 65. The suction nozzle is one meter below pump centerline. The pressure at this point is equal to 200 kPa gauge and velocityis 3 m/s. Steam tables show saturation pressure at 65 is 25 kPa, and specific volume of the saturated liquid is 0.0010 . The pump Net Positive Suction Head (NPSH) in meters is

(A) 24

(B) 26

(C) 28

(D) 30

GATE-ME-2006

Question 7. A large hydraulic turbine is to generate 300 kW at 1000 rpm under a head of 40 m. For initial testing , a 1:4 scale model of the turbine operates under a head of 10 m. The power generated by the model (in KW) will be

(A) 2.34

(B) 4.68

(C) 9.38

(D) 18.75

GATE-ME-2006

Question 8. In a pelton wherel, the bucket peripheral speed is 10 m/s, the water jet velocity is 25 m/s and volumetric flow rate of the jet is 0.1 . If the jet deflection angle is 120and the flow is ideal, the output DEVELOPED is

(A) 7.5 kW

(B) 15.0 kW

(C) 22.