Hydraulic Machines MCQs
Hydraulic Machines MCQs
Answer these 400+ Hydraulic Machines MCQs and see how sharp is your knowledge of Hydraulic Machines.
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1: In an impulse turbine, the jet of water impinges on the bucket with a low velocity and after flowing over the vanes, leaves with a high velocity.
A. True
B. False
2: A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
A. 0.25 kW
B. 0.75 kW
C. 3.75 kW
D. 1.75 kW
3: When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
A. Agree
B. Disagree
4: The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
A. Slow speed with radial flow at outlet
B. High speed with radial flow at outlet
C. Medium speed with radial flow at outlet
D. High speed with axial flow at outlet
5: If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
A. Dynamic similarity
B. Kinematic similarity
C. None of these
D. Geometric similarity
6: The maximum number of jets, generally, employed in an impulse turbine without jet interference are
A. Eight
B. Four
C. Two
D. Six
7: In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.
A. False
B. True
8: Which of the following statement is wrong?
A. The reaction turbines are used for low head and high discharge.
B. An impulse turbine is generally fitted slightly above the tail race.
C. The angle of taper on draft tube is less than 8°.
D. A Francis turbine is an impulse turbine.
9: Slip of a reciprocating pump is negative, when
A. Delivery pipe is long and pump is running at high speeds
B. Suction pipe is short and pump is running at low speeds
C. Suction pipe is short and delivery pipe is long and the pump is running at low speeds
D. Suction pipe is long and delivery pipe is short and the pump is running at high speeds
10: The speed of a turbine runner is
A. Directly proportional to H3/2
B. Inversely proportional to H1/2
C. Directly proportional to H1/2
D. Inversely proportional to H3/2
11: Manometric head, in case of a centrifugal pump, is equal to
A. Workdone per kN of water - Losses within the impeller
B. All of these
C. Energy per kN at outlet of impeller - Energy per kN at inlet of impeller
D. Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
12: A Francis turbine is used when the available head of water is
A. 25 m to 250 m
B. Above 250 m
C. None of these
D. 0 to 25 m
13: In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.
A. False
B. True
14: For centrifugal pump impeller, the maximum value of the vane exit angle is
A. 10° to 15°
B. 25° to 30°
C. 15° to 20°
D. 20° to 25°
15: The efficiency of a reaction turbine for a given head __________ with the increase in speed.
A. Decreases
B. Increases
16: A reciprocating pump is also called a __________ displacement pump.
A. Positive
B. Negative
17: The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.
A. Product
B. SUM
C. Difference
18: Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.
A. Square of diameter
B. Fourth power of diameter
C. Diameter
D. Cube of diameter
19: The overall efficiency for a Pelton wheel lies between
A. 0.50 to 0.65
B. 0.75 to 0.85
C. 0.65 to 0.75
D. 0.85 to 0.90
20: Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
A. Q = π.b.Vf
B. Q = π.D.Vf
C. Q = π.D.b.Vf
D. Q = D.b.Vf
21: What type of damage is caused by abrasions?
A. Both external and internal damage
B. Internal damage
C. External damage
D. Scarring
22: At what point is ABSOLUTE zero?
A. Integral
B. Point
C. Derivative
D. Converting to radians
E. Base
23: What is the absolute pressure equal to if we add gauge pressure?
A. Plus atmospheric pressure
B. Less atmospheric pressure than gauge pressure
C. Equal to atmospheric pressure
D. Less than atmospheric pressure
24: What type of pressure is zero-referenced against?
A. Absolute pressure
B. Atmospheric pressure
C. Gauge pressure
25: What is the ratio of stress to rate called?
A. PERCENTAGE OF LIQUID CONTENT
B. RELATIVE VISCOSITY
C. ABSOLUTE VISCOSITY
D. ELASTICITY
E. PERMEABILITY
26: What is the process of integrating one material into another?
A. ABSORPTION
B. DECOMPOSITION
C. EJECTION
D. REACTION
E. CONVEYANCE
27: What kind of integration is absorption?
A. Aggregation
B. The
C. Transposition
28: What does the term "accumulator" refer to in hydraulic systems?
A. A pump that circulates fluid
B. A container or vessel
C. A device used to measure fluid pressure
D. A pump
29: What is a type of hydraulic accumulator called that stores hydraulic fluid or gas under pressure?
A. Tank
B. Disk
C. Wedge
D. Drum
E. Piston
30: What is the ability of a system to achieve?
A. Reproduction
B. To adjust to changing conditions
C. Redundancy
D. The ability to replicate itself
E. The desired output
31: What is the measure of an accuracy system?
A. The number of correct decisions the system makes
B. The number of incorrect responses
C. The ability of the system to achieve the desired output
D. The number of incorrect decisions the system makes
E. The percentage of correct responses
32: What are the hydraulic components of an actuator?
A. Electrical components, hydraulic motors and hydraulic rotary actuators
B. Hydraulic cylinders, hydraulic motors and pneumatic valves
C. Hydraulic cylinders, hydraulic motors and hydraulic rotary actuators
D. Pneumatic components, electric components and hydraulic rotary actuators
E. Pneumatic components, hydraulic motors and hydraulic rotary actuators
33: What does an actuator do without intensifying the power?
A. Redirect
B. Increase
C. Decrease
D. Transfer
E. Generate
34: What can a fitting be made out of to change its size?
A. Shape
B. Material
C. Thread
D. Size
E. Fabric
35: A device used to align the shaft of a rotary device is called what?
A. Holder
B. Bearing
C. Adapter
D. Assembler
E. Adapter plate
36: To what does hydraulic fluid additives enhance properties?
A. Those which are not present naturally
B. Reduces friction
C. Those which already exist
D. Those which improve performance
E. Increases power
37: What causes hydraulic fluid to appear milky?
A. Acidic conditions
B. A build up of residue
C. Lack of air circulation
D. A build up of grit
E. Excessive aeration
38: What can excessive aeration cause?
A. Erratic systems performance
B. Waterlogged soils
C. Poor crop growth
D. Reduced yields
39: What does an air bleeder do?
A. Removal of air
B. Removal of fluid
C. Removal of gas
D. Removal of oil and grease
E. Removal of water
40: What type of device is used to remove air from the pipeline?
A. AIR SCREEN
B. PIPELINE FILTER
C. AIR BLEEDER
D. AIR PRESSURE SINK
E. AIR CLEANER
41: To which component would an AIR BREATHER be attached to allow air to pass in and out?
A. TANK or AIR FILTER
B. AIR FILTER or RESERVOIR
C. RESERVOIR or TANK
D. AIR FLOW CONTROL DEVICE
E. ENGINE
42: What does air compressed to a high pressure do?
A. Air at any pressure greater than atmospheric pressure
B. It forms a liquid
C. It causes an explosion
D. It creates a vacuum
E. It becomes a gas
43: What type of coupling halves are used to connect hydraulic hoses?
A. Ball-and-socket coupling
B. Quick-release
C. Hose clamp
D. C-clamp
E. Friction coupling
44: What is the air-cooled heat exchanger used to relieve?
A. To prevent over-heating
B. Excessive heat
C. A new engine
D. Inefficient cooling
E. A broken fan belt
45: What type of heat exchanger relieves heat in hydraulic systems?
A. WATER-COOLED
B. RADIATOR
C. AIR-COOLED
D. SIDE-FLOW
46: What is the name of the hydraulic component used to store fluid?
A. Heater
B. Piston
C. Air-operated accumulator
D. Reservoir
E. Pneumatic accumulator
47: How does the air-operated accumulator increase and relieve hydraulic pressure?
A. Through the use of an inflatable bag
B. By using a pump
C. By generating its own pressure
D. By using a piston
48: What does the name of the component mean?
A. AIR-OVER-OIL INTENSIFIER
B. LIFTING ASSEMBLY
C. FUEL AIR INTAKE
D. HEAT EXCHANGER
E. PUMP
49: What is powered by the air?
A. A hydraulic component
B. A fan
C. A compressor
D. A water pump
50: What term best describes the condition of the air in an area?
A. Polluted
B. Pollution
C. Unhealthy
D. Dust Storm
E. Ambient
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Hydraulic Machines MCQs
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Hydraulic Machines MCQs
