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100+ Free Elementary Mine Survey Certificate Exam Practice Questions
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Sample Elementary Mine Survey Certificate Exam Practice Questions
Try these sample questions to test your Elementary Mine Survey Certificate Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1What primary function does the tubular plate level (bubble vial) serve during the setting up of an optical theodolite over a survey peg?
A.It aligns the vertical axis of the instrument parallel to the direction of gravity.
B.It levels the horizontal crosshair with the target point.
C.It aligns the line of sight along the magnetic meridian.
D.It ensures that the optical plummet line coincides with the trunnion axis.
Explanation: The tubular plate level is used to bring the vertical axis (standing axis) of the theodolite precisely parallel to the direction of gravity (plumb line). When the plate bubble is centered across all positions, the horizontal circle lies in a true horizontal plane.
2When observing with a theodolite, what is the principal reason for taking both Face Left (FL) and Face Right (FR) readings to a target?
A.To double the magnification of the telescope for distant targets.
B.To eliminate index error of the vertical circle and horizontal collimation error.
C.To calculate the curvature of the Earth over long underground sights.
D.To automatically compensate for tension variations in the measuring tape.
Explanation: Averaging Face Left (FL) and Face Right (FR) observations cancels out instrumental systematic errors, including horizontal collimation error, vertical circle index error, and trunnion axis inclination error.
3An operator notices that when rotating a centered theodolite by 180°, the plate bubble runs off by 2 divisions. What does this indicate?
A.The optical plummet is out of adjustment.
B.The plate bubble axis is not perpendicular to the vertical axis.
C.The target is at a different elevation than the instrument.
D.The trunnion axis is perpendicular to the vertical axis.
Explanation: If the plate bubble runs off when rotated by 180°, the bubble tube axis is not perpendicular to the vertical (standing) axis of the theodolite. Half of the error is corrected using the bubble foot-screws and half using the bubble adjustment capstan screws.
4Which component of a traditional mine survey theodolite allows fine alignment of the vertical crosshair onto a target peg line?
A.Horizontal clamp screw
B.Horizontal tangent (slow-motion) screw
C.Tribrach foot screw
D.Vertical circle indexing lever
Explanation: Once the horizontal clamp is locked to fix the upper motion roughly on target, the horizontal tangent screw (slow-motion screw) provides precise rotational adjustment to bisect the target.
5When setting up a theodolite under a roof survey peg (hanging wall spad) in underground mining, what accessory is attached to suspend the plumb line correctly?
A.Gunter's chain link
B.Plumb bob with line slider or spad bracket
C.Levelling staff bracket
D.Target reflector prism pole base
Explanation: In underground workings, survey pegs are commonly installed in the hanging wall (roof). A plumb line suspended from a spad bracket or string slider hangs beneath the roof peg to center instrument standard targets or center the telescope top point.
6What is the term for the optical effect where the target image formed by the objective lens does not fall exactly on the plane of the reticle crosshairs?
A.Refraction
B.Parallax
C.Collimation offset
D.Aberration
Explanation: Parallax occurs when the focal plane of the objective lens does not coincide with the reticle crosshair plane. Moving the observer's eye across the eyepiece causes relative motion between the crosshair and target image.
7How is parallax correctly eliminated when viewing through a survey instrument telescope?
A.Focus the eyepiece on the crosshairs first against a plain background, then focus the objective lens on the target.
B.Adjust the tribrach foot screws until the crosshairs stop moving.
C.Rotate the instrument from Face Left to Face Right.
D.Increase the brightness of the reticle illumination LED.
Explanation: Eliminating parallax requires a two-step process: first, point the telescope at a bright clear background and rotate the eyepiece ring until the crosshairs are sharp. Second, use the main focusing ring to bring the target image sharply onto the crosshair plane.
8In a correctly adjusted theodolite, what exact geometric relationship must exist between the trunnion axis (horizontal axis) and the vertical axis?
A.They must be parallel to each other.
B.They must be perpendicular to each other.
C.They must form an angle equal to the local magnetic declination.
D.They must intersect at a 45-degree angle.
Explanation: The trunnion axis (around which the telescope rotates vertically) must be strictly perpendicular to the instrument's vertical axis (standing axis). If non-perpendicular, trunnion axis error causes horizontal directional errors on inclined sights.
9What internal component allows an automatic optical level to maintain a horizontal line of collimation even if the instrument barrel is slightly tilted?
A.An optical glass micrometer plate
B.A pendulum-suspended prism/mirror compensator
C.A electronic laser diode sensor
D.A liquid crystal display index
Explanation: Automatic levels feature an internal gravity-settled pendulum compensator (using prisms or mirrors) that automatically bends the line of sight so that it remains horizontal despite small residual instrument tilts.
10What is the operating range of the circular bull's-eye bubble on an automatic level before the internal compensator can take over leveling?
A.The circular bubble must be completely centered within its black indicator ring.
B.The circular bubble can be anywhere on the vial glass.
C.The bubble is only required during vertical shaft Plumbing.
D.The circular bubble is only checked at the end of the shift.
Explanation: The internal pendulum compensator of an automatic level has a limited working range (typically ±10 to ±15 arc-minutes). The user must level the circular bull's-eye bubble within its center circle using tribrach screws so the compensator operates within its free-swing range.
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