Hp Mcq Modified - One Marks - Introductory Physics - Past Exam With Solutions PDF

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1. Pascal's law states that pressure in a confined body of liquid will act_____________in all directions. a) erratically b) equally c) forward d) sequentially 2. Most of the energy not used to move the load in a hydraulic system turns into____________. a)light

b) heat

c) potential

d) reserve

3. The pressure of the fluid at rest increases on ________ the depth. a) Increasing b) Decreasing c) Either increase or decrease d) Neither increase nor decrease. 4. When do you prefer the pneumatic system rather than hydraulic system? a) Medium amount of pressure requires speed, fairly accurate feed. b) Large amount of pressure requires speed, fairly accurate feed. c) Large amount of pressure requires less speed, fairly accurate feed d) Medium amount of pressure requires speed, accurate feed 5. Hydraulic system is always a ______________. a) closed loop system b) open loop system c) open or closed loop system.

1. are shapeless substances that take the shape of their containers; they can be liquids or gasses. a) Air b) Water c) Oil d) Fluids

2.

power is pressurized liquid or gas in a closed system.

a) Fluid b) Electrical c) Mechanical d) Thermal

3. _____________________use pressurized oil or other liquids. a)Pneumatics b) hydraulics c) Electrical d) Electromechanical

4.

use pressurized air or other gasses.

Pneumatics b) hydraulics c) Electrical d) Electromechanical

5. By itself, fluid has no power, but when confined and placed under , fluid can transmit power that can be stored, directed and made to do work.

a) Volume b) Force c) pressure d) Area

1. A is a solid cylinder or disk that fits snugly into a larger cylinder and moves under fluid pressure. a) Piston rod b)Piston c) rod d) pump 2 By changing the size of the pistons in a fluid power system, we can obtain a advantage, that is we multiply the force applied. a) mechanical b) Hydraulic c) Pneumatic d) Fluid 3. The piston that controls the fluid system is the

cylinder.

a) Primary b) Secondary c) master 4. Fluid power systems amplify power, power.

power and

a) control and transmit b) control and produce c) transmit and produce d) produce and control 5. Pascal's Law states that pressure acting on a confined fluid is _______________equally and undiminished in all directions. a) Pressurised b) controlled c) increased d) transmitted

1. If Reynolds number is ___________. Transient flow (< 2000, >4000). 2. Laminar flow is called ___________. a)Viscous or stream line flow b) Laminar flow c) Turbulent flow 3. If Reynolds number is ___________ Laminar flow. a)2000 c) 4000 4. If Reynolds number is ___________. Turbulent flow. a)2000 c) 4000 d) >4000 5. What is absolute pressure? a) Gauge pressure + atmospheric pressure b) atmospheric pressure - Gauge pressure c) Gauge pressure - atmospheric pressure d) atmospheric pressure

1. Hydraulic fluid transmits power almost instantaneously because _____. A. it lubricates components B. it is essentially non-compressible

C. it is compressible D. it is heavier than water 2. A pump which develops a constant output is called _____. A. a high efficiency pump B. a positive displacement pump C. a variable volume pump D. an impeller pump 3. All pumps operate on the principle of _____. A. an increasing and decreasing flow rate B. an increasing and decreasing volume C. mechanical work D. restricted flow 4. The device used to power the pump in a hydraulic system is called _____. A. a generator B. an actuator C. a prime mover D. a power cell

1.

Vane pumps: a . can be variable volume. b. cannot be variable volume. c. cannot be pressure compensated.

2. How the eccentricity is varied? a) Rotor b) Cam ring c) Stator d) Gear 3. What is the resultant when the eccentricity is maximum? a) Velocity reduces b) velocity increases c) discharge increases d) discharge decreases 4.. Piston pumps . a. can be variable volume. b. b. cannot be variable volume. c. cannot be pressure compensated.

5. The piston pump discharge varied by ___________ a) Changing the direction of rotation b) changing the distance between cylinders c) keeping the shafts in straight line d) changing the inline angle

1. A ram cylinder can only have_________________in one direction. A. movement

B. force

C. Rotation

2. A ram cylinder has: A. a piston with seals to guide it. B. no piston or seals to guide it. C. a non sealing guide only. 3. The area of a cylinder is figured with the formula: A. F=PA

B. π r2

C. π d2

4. Cylinder force or thrust is figured by the formula: A. F=PA

B. π r2

C. π d2

5. A 2:1 area ratio cylinder has a rod that is: A. half the diameter of the piston. B. twice the diameter of the piston. C. half the area of the piston.

1. A double rod end cylinder with the same pressure at either end can have: A. equal force and speed in both directions of travel. travel. C. either of the above.

B. higher force in one direction of

D. Slower speed in both direction

2. With the same pressure at either end a single rod end cylinder has: A. equal force in both directions of travel. B. more force extending. force retracting. D. Less force in both directions of travel

C. more

3. Cable cylinders are: A. twice as long as their stroke. longer than their stroke..

B. three times as long as their stroke.

C. slightly

4. Tandem cylinders can have almost_________________the force as a single cylinder. A. One time

B. Twice

C. three times

D. four times

5. A cylinder with an actual 2:1 rod in a regeneration circuit will: A. extend twice as fast as retract. cannot regenerate a 2:1 rod cylinder.

B. extend and retract at the same speed.

C.

1. Hydraulic motors are usually rated in: A. pounds force. B. lb. in., lb. ft. or newton meters torque. C. horsepower. D. KW hour 2. Gear on gear hydraulic motors offer: A. high torque low RPM output. B. high RPM low torque output. C. high RPM nominal torque output. D. Low torque low RPM output 3. Axial or inline piston motors offer: A. high torque low RPM output.

B. high RPM high torque output.

C. Low torque low RPM output D. both of the above. 4. Radial piston hydraulic motors offer: A. high torque low RPM output. B. Low torque low RPM output C. high RPM low torque output. D. high RPM nominal torque output. 5. Single vane rotary actuators give up to: A. 90° rotary output. B. 180° rotary output. C. 270° rotary output. D.360° rotary output

1. A plain check valve can be used as: A. pilot-operated relief valves B. direct-acting relief valves C. either type relief valve 2. A 4-way valve has: A. two working ports B. three working ports C. four working ports 3. A Series bar manifold can have up to: A. one station. B. two stations. C. three stations.

4. Stroke limiters on the working spool of a solenoid pilot operated valve can: A. slow spool travel. B. speed up spool travel C. control actuator speed. 5. Direct solenoid operated valves: A. are only DC current activated. B. are only AC current activated. C. operate off either AC or DC current.

. Direct acting relief valves have ___________ response than/as a pilot operated relief valve. A. slower B. same C. Faster 2. Pilot operated relief valves have ___________ pressure override than/as a direct acting relief valve. A. more B. less C. the same 3. Solenoid operated relief valves can be made from: A. direct acting relief valves. B. pilot operated relief valves. C. either type relief valve. 4. A vent port is found on: A. pilot operated relief valves. B. direct acting relief valves. C. either type relief valve. 5. Solenoid operated relief valves can be used: A. on the case drain of a pump. B. on the tank line of a pump. C. to unload the pressure port of a pump.

1. Amount of flow in a pipe line can be adjusted by A. Changing the size of flow path B. Changing the diameter of the pipe C. Changing the length of pipe D. Changing the height of pipe 2. A needle valve controls flow in: A. both directions. B. one direction. C. neither direction. 3. Pressure compensated flow control valves maintain a constant flow: A. because they have a special needle valve. B. when pressure stays under 2,000 PSI. C. because they maintain a constant pressure drop across the orifice. 4. A 3-port flow control: A. can control different flows to several actuators at once. B. can only control one actuator at a time C. operates at maximum pressure for the whole cycle. 5. Flow control valve is used to control_________ A. Heat B. Velocity C. Pressure D. Force

1. By changing the size of the pistons in a fluid power system, we can obtain _______ advantage. A)

Pneumatic

B)

Hydraulic

C)

Electrical

D)

Mechanical

3.

4.

5.

Fluid power systems ___________ power. A)

Transmit and Produce

B)

Control and Produce

C)

Produce and control

D)

Control and transmit

A pump which develops a constant output is called ________________. A)

A high efficiency pump

B)

An impeller pump

C)

A positive displacement pump

D)

A variable volume pump

The piston pump discharge is varied by ___________ A)

Changing the direction of rotation

B)

Changing the material of construction

C)

Keeping the shafts in straight line

D)

Changing the inline angle

7. A double piston tandem cylinders can have almost _________________the force as a single cylinder.

8.

9.

A)

Twice

B)

Four times

C)

Three times

D)

One time

Telescopic cylinders have A)

Only two stage units

B)

Multistage units

C)

Only three stage units

D)

Two or three stage units

The flow control valves are used to control the A)

Speed of flow

B)

Direction only

C)

Direction and pressure of flow

D) 10.

11.

12.

Pressure of flow

A needle valve controls flow in A)

Both directions

B)

Forward direction

C)

Neither direction

D)

Reverse direction

Shuttle valve is used to control A)

Speed

B)

Pressure

C)

Direction

D)

Flow rate

Pressure Intensifier is a device used to _________ the pressure of a hydraulic system. A)

Decrease

B)

Maintain

C)

Boost -up

D)

Divide

13. A pressure relief valve has a setting pressure of 200 bar. Determine power loss across the valve if all the fluid flows back to reservoir at the rate of 0.002 m3/s.

14.

16.

A)

400 kW

B)

4000 kW

C)

400 kW

D)

40 kW

the graphic symbol refers to

A)

Tandem cylinder

B)

Rodless cylinder

C)

Double acting cylinder

D)

Single acting cylinder

Proportional valves are used to remotely control ________ via electrical signal. A)

Direction and pressure

B)

Force and flow rate

17.

18.

C)

Speed and direction

D)

Speed and pressure

PLC refers to A)

Programmable logic controller

B)

Progress level controller

C)

Program loss control

D)

Programme least count

The cycle time of a PLC is the time it takes to A)

Check all input signal

B)

Update all outputs

C)

Read and input signal

D)

Read all input signal

19. _________ gives speed control during a work stroke by regulating flow to the cylinder.

20.

A)

Meter-in circuit

B)

Synchronizing circuit

C)

Meter-out circuit

D)

Sequential circuit

—(\)— the ladder symbol is a ‘NOT’ coil, A)

Energized whenever its rung is open

B)

Energized whenever its rung is closed

C)

energized whenever its power is open

D)

Never get energized

1. Pascal's law states that pressure in a confined body will act__________ in all directions.

2.

A)

Radially

B)

Erratically

C)

Equally

D)

Sequentially

Darcy’s equation holds good for

3.

4.

5.

6.

7.

8.

A)

Irrotational flow

B)

Both Laminar and Turbulent

C)

Laminar flow

D)

Turbulent flow

Identify the type of energy conversion takes place in hydraulic cylinder A)

Electrical to mechanical

B)

Fluid to electrical

C)

Fluid to mechanical

D)

Mechanical to electrical

If Reynolds number is ___________ then the flow of fluid is transient. A)

< 2000

B)

>4000

C)

> 2000

D)

< 4000

Among the following which pump operates quietly? A)

Screw pump

B)

Gear pump

C)

Piston pump

D)

Vane pump

Find the theoretical discharge of a pump, if QA = 0.12 m3/min, ɳv = 95%. A)

0.114 m3/min

B)

11.4 m3/min

C)

7.916 m3/min

D)

0.126 m3/min

Hydraulic motors are usually rated in A)

Newton meters

B)

KW hour

C)

Horsepower

D)

Pounds force

With the same pressure at either end a single rod end cylinder has

A)

More force while retracting

B)

No difference in force created

C)

More force while extending

D)

Equal force in both directions of travel

9. Identify the valve that allows fluid to flow in one direction but closes automatically to prevent flow in the opposite direction. A)

Shuttle valve

B)

Poppet valve

C)

Needle valve

D)

Check valve

10. When system pressure exceeds the set pressure ______ will be enabled to keep the system safe.

11.

12.

13.

A)

Pressure sequence valve

B)

Pressure relief valve

C)

Pressure reducing valve

D)

Shuttle valve

Needle valve is a A)

Direction control valve

B)

Pressure control valve

C)

Flow control valve

D)

Sequence control valve

Gas loaded accumulator uses ________ gas to pressurize the liquid. A)

Hydrogen

B)

Oxygen

C)

Neon

D)

Nitrogen

the graphic symbol refers to

A)

Double acting cylinder

B)

Tandem cylinder

C)

Single acting cylinder

D) 14.

Rodless cylinder

Find the pneumatic system component A)

FRL unit

B)

Pump

C)

Tank

D)

Accumulator

15. __________ are used in applications requiring high power, high starting torque, and accurate speed control at low speeds.

16.

17.

18.

A)

Vane motor

B)

Gear motor

C)

Piston air motor

D)

Electrical motor

the graphic symbol indicates A)

Shuttle valve

B)

Check valve

C)

Needle valve

D)

Poppet valve

An “OR” element has an output when it has ________input/s. A)

Zero

B)

Three

C)

Two

D)

One

Pressure intensifiers are used in a circuit to supply A)

Very high pressure

B)

Pilot pressure

C)

Low pressure

D)

Medium pressure

19. _________ gives speed control during a work stroke by regulating flow from the cylinder. A)

Meter-in circuit

B)

Synchronizing circuit

20.

C)

Meter-out circuit

D)

Sequential circuit

Regenerative circuit is used to ____________ the extending stroke. A)

Regulate

B)

Slow down

C)

Maintain

D)

Speedup...