1) What causes reduction in speed of the piston rod when the hydraulic cylinder is cushioned? a. oil flow through small space b. back pressure created in the system c. both a. and b. d. none of the above
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2) Which of the following is a hydraulic cylinder based on application? a. welded b. bolted c. ram d. all of the above
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3) What happens when supply of oil to a single acting cylinder is stopped? a. no pressure is exerted on the system b. more pressure is exerted on the piston c. less pressure is exerted on the piston d. none of the above
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4) When does expansion of spring and retraction of cylinder take place in spring type single acting cylinder? a. oil pressure exerted is less than spring compression pressure b. oil pressure exerted is more than spring compression pressure c. oil pressure exerted and spring compression pressure are same d. none of the above
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5) Double acting cylinder can be used as a single acting cylinder a. True b. False
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6) In a telescopic cylinder, as the number of stages increase a. diameter of piston rod also increases b. diameter of piston rod decreases c. diameter of the piston rod remains the same d. none of the above
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7) Why are bleed off circuits used? a. bleed off circuit is used to restrict the flow of fluid into the hydraulic cylinder b. bleed off circuit is used to restrict the flow of fluid out of the hydraulic cylinder c. bleed off circuits are used to reduce the speed of actuator d. all of the above
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8) Which of the following is applicable for bleed off circuits? a. bleed off circuits develop heat in the system b. bleed off circuits are used for resistive loads c. bleed off circuits are used for runaway loads d. all of the above
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9) What is the function of sequence valve used in hydraulic circuits? a. sequence valves are used to perform number of operations one after the other after the set pressure is reached b. sequence valves are used to perform number of operations continuously before the set pressure is reached c. sequence valves after reaching set pressure oil is flown to the tank d. all of the above
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10) When is a pressure reducing valve used? a. it is used when higher pressure than system pressure is required b. it is used when lower pressure than system pressure is required c. when absolutely zero pressure is required d. all of the above
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11) How is strong magnetic field in a solenoid achieved? a. strong magnetic field in a solenoid is achieved, if coil acts as conductor b. coil is surrounded by a iron frame c. iron core is placed at the centre of the coil d. all of the above
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12) What is the DC range of of solenoids in pneumatic systems? a. 12 V and 24 V b. 110 V and 220 V c. both a. and b. d. none of the above
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13) Which of the following is used an output device on a ladder diagram? a. proximity sensor b. detent switch c. relay d. all of the above
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14) The output device on a ladder diagram is represented by a. square b. circle c. rectangle d. semicircle
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15) In mnemonics instructions, what does I in LDI indicate? a. switch is normally open b. switch is normally closed c. it indicates operating of second switch d. none of the above
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16) In industrial applications hydraulic fluids have viscosity grade ranging from a. 20 to 50 b. 70 to 95 c. 46 to 68 d. 15 to 44
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17) High viscosity fluids have a. low pressure drop b. less power consumption c. slow operation d. all of the above
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18) What is viscosity index? a. effect of pressure on changes in viscosity b. effect of temperature on changes in viscosity c. effect of resistance between two surfaces d. none of the above
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19) Highest temperature at which a fluid in hydraulic system flows is called its pour point. a. True b. False
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20) Which property decides the behavior of fluid when mixed with water? a. pour point b. demulsibility c. viscosity d. oxidation
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