1) Head loss hf due to friction is given by
a. 4 ƒ l v2 / g d
b. 4 f2 l ν / 2 g d
c. 2 ƒ l v 2 / 2 g d
d. 4 ƒ l v2 / 2 g d
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2) Head loss due to friction (hf) is a function of
1. velocity head
2. pressure head
3. length to diameter ratio
4. diameter to length ratio
5. friction factor
a. 1, 2 and 3
b. 1, 4 and 5
c. 1, 3 and 5
d. all of the above
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3) What are the reasons causing pressure drop in hydraulic systems?
1. long length of pipe
2. friction
3. type of fluid
4. losses in valves and bends
a. 1 and 4
b. only 1
c. 2 and 3
d. all of the above
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4) Calculate area of a pipe if, flow rate is 20 l/min and flow velocity is 5 cm/s.
a. 66.66 cm2
b. 60 cm2
c. 62 cm2
d. none of the above
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5) Which formula is used to calculate head loss in valves?
a. K2 ( v / 2 g )
b. K ( v / 2 g )
c. K ( v2 / 2 g )
d. none of the above
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6) What is the difference between vane pump and radial piston pump?
a. in radial piston pump, radial slots in vane pumps are replaced by radial bores which accommodate pistons
b. in radial piston pump, radial slots in vane pumps are replaced by radial bores which accommodate swash plate
c. in radial piston pump, radial slots in vane pumps are replaced by radial bores which accommodate both swash plate and pistons
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: in radial piston pump, radial slots in vane pumps are replaced by radial bores which accommodate pistons
Explanation:
No explanation is available for this question!
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7) What is the advantage of multiple piston pump?
a. multiple piston pump do not have pulsating flow
b. multiple piston pump have pulsating flow which is required
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Answer
Explanation
Related Ques
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ANSWER: multiple piston pump do not have pulsating flow
Explanation:
No explanation is available for this question!
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8) How many strokes does a single piston pump need to discharge oil?
a. one stroke
b. two strokes
c. three strokes
d. none of the above
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9) How is the arrangement of pistons in piston pumps?
a. axially
b. radially
c. both a. and b.
d. none of the above
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10) In which of these pumps, swash plate is used to translate the motion of rotating shaft into reciprocating motion?
a. radial piston pumps
b. axial piston pump
c. bent axis piston pump
d. all of the above
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11) Which factors are considered while designing a axial piston pump?
a. use of swash plate
b. application in open loop or closed loop circuit
c. design of bent axis piston pump
d. all of the above
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12) Angle of swash plate in axial piston pump is adjusted by
a. compensator
b. yoke
c. both a. and b.
d. none of the above
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13) In axial piston pump, the yoke is pushed away from cylinder block due to which,
a. yoke angle increases
b. swash plate angle decreases
c. both a. and b.
d. none of the above
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14) When the angle of swash plate decreases
a. flow rate increases
b. flow rate decreases
c. flow rate does not depend on swash plate angle
d. none of the above
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15) What will be the discharge of oil in axial piston pump, when the angle of swash plate is zero?
a. discharge of oil is maximum
b. discharge of oil is minimum
c. there is no discharge of oil
d. none of the above
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16) Which of the following statements are true?
1. piston pumps are self priming
2. piston pumps require high maintenance
3. piston pumps have low cost of production
4. piston pumps have low volumetric efficiency
a. 1 and 2
b. 3 and 4
c. 1 and 3
d. all of the above
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17) A bent axis piston pump has
a. pump axis bent
b. cylinder block which is inclined at an angle to the drive shaft
c. both a. and b.
d. none of the above
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Answer
Explanation
Related Ques
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ANSWER: cylinder block which is inclined at an angle to the drive shaft
Explanation:
No explanation is available for this question!
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18) In which of these pumps, swash plate is replaced by cylinder block?
a. bent axis piston pump
b. radial piston pump
c. axial piston pump
d. none of the above
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19) What happens when the distance between flange and cylinder block is varied?
a. piston displacement cannot be varied
b. variable flow rate of fluid can be achieved
c. fixed flow rate can be achieved
d. all of the above
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20) What is the maximum angle between cylinder block and shaft axis?
a. 30o
b. 50o
c. 45o
d. all of the above
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21) When does holding piston keep the angle between yoke and cylinder block maximum?
a. when set pressure is greater than load pressure
b. when set pressure is less than load pressure
c. when set pressure and load pressure are same
d. all of the above
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Answer
Explanation
Related Ques
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ANSWER: when set pressure is greater than load pressure
Explanation:
No explanation is available for this question!
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22) What is the function of hydraulic motor?
1. hydraulic motor converts hydraulic oil under pressure into torque and angular displacement
2. hydraulic motor converts hydraulic oil under pressure into force and linear displacement
3. hydraulic motor converts hydraulic energy into mechanical energy
4. hydraulic motor converts mechanical energy into hydraulic energy
a. 1 and 4
b. 1 and 3
c. 2 and 3
d. 2 and 4
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23) Low-torque high-speed motors are used in
a. cranes
b. winches
c. fans
d. all of the above
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24) Which motor causes heavy loads due to its usage in order to move at constant lower speeds?
a. Low-torque high-speed motors
b. High-torque low-speed motors
c. both a. and b.
d. none of the above
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25) Motors used in high speed applications have
a. high torque with high speed
b. low torque with high speed
c. high torque with low speed
d. none of the above
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26) Which of the following is a type of low-torque high-speed motor?
a. radial piston motors
b. axial piston motors
c. bent axis motor
d. gear motor
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27) Cam lobe hydraulic motor is a type of
a. axial hydraulic motor
b. orbit hydraulic motor
c. gear hydraulic motor
d. radial hydraulic motor
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28) Match the following group 1 items with group 2 items and select the correct option.
1. Radial motor --------------------------- A. Swash plate
2. Axial motor ----------------------------- B. Crank shaft motor
3. Orbit -------------------------------------- C. Vane motor
4. Low torque motor ---------------------- D. Geroller motor
a. 1-B, 2-A, 3-D, 4-C
b. 1-A, 2-C, 3-B, 4-D
c. 1-C, 2- A, 3-B, 4-D
d. 1-B, 2-D, 3-A, 4-C
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