NGWA - STUDY QUESTIONS - GENERAL
DRILLING EXAM QUESTIONS AND
ANSWERS 2025
Artesian ggPressure ggis gggenerally... gg- ggANSWER: gg... gga ggresult ggof gggravity ggand
ggconfining ggbeds.
What ggis ggtrue ggabout ggthe ggorigin ggof ggrocks? gg- ggANSWER: gg1. ggSandstones
ggwere ggonce ggsand ggdeposits ggand ggcould gghave ggbeen ggriver ggsand, ggbeach
ggsands, ggor ggdune ggsands.
2. ggSome gglimestones ggcontain ggfossils ggbecause ggthey ggwere ggonce ggthe ggmucky
ggbottoms ggof ggshallow ggseas.
3. ggShales ggwere ggonce ggclay ggbeds.
Sedimentary ggformations ggmay ggreach ggdepths ggof gga ggmile ggor ggmore.
(T/F) ggGround ggwater, gglike ggsurface ggwater, gghas gga ggtendency ggto ggflow ggdownhill.
gg- ggANSWER: ggTrue.
The ggthree ggmain ggtypes ggof ggrock ggare... gg- ggANSWER: gg... ggigneous,
ggsedimentary, ggand ggmetamorphic.
Water ggwould ggbe ggleast gglikely ggfound ggin ggwhat gggeological ggformation? gg-
ggANSWER: ggGranite.
(T/F) ggMore ggthan gg90% ggof ggour ggnation's ggfresh ggwater ggis ggunderground? gg-
ggANSWER: ggTrue.
Prior ggto ggsetting ggthe ggrig, ggyou ggshould... gg- ggANSWER: gg1. ggMake ggsure ggthere
ggare ggno ggoverhead ggpower gglines ggwithin ggat ggleast gg20' ggof ggthe ggmast.
2. ggLocate ggall ggburied ggmaterials.
3. ggVerify ggyou ggare ggon ggthe ggright ggproperty ggand ggmeet ggthe ggcorrect ggsetback
ggrequirements.
Confined ggspace ggentry ggrules ggrequire... gg- ggANSWER: gg1. ggShoring ggof ggtrench
ggwalls ggover gg4' ggdeep.
2. ggEstablishment ggof ggbuddy ggsystem.
3. ggHave ggdriller's ggassistant ggcheck ggjacks ggas ggoperator gglevels ggrig.
, In ggsetting ggup ggand ggleveling ggthe ggrig, ggthe ggright ggprocedure ggis ggto... gg-
ggANSWER: gg1. ggUse ggsuitable ggjack ggpads ggfor ggstabilization.
2. ggPosition ggrig ggfor ggminimum ggleveling.
3. ggHave ggdriller's ggassistant ggcheck ggjacks ggas ggoperator gglevels ggrig.
(T/F) ggA ggwell ggmay ggbe ggused ggas ggsewage ggdisposal ggsite ggonly ggif ggit ggis ggcased
ggto ggthe ggbottom ggof ggthe ggborehole. gg- ggANSWER: ggFalse.
When ggconsidering ggthe ggwell ggsite, ggthe ggmore ggimportant ggthing ggto ggconsider ggis
ggthe... gg- ggANSWER: gg... ggplace ggwhere ggit ggis ggleast gglikely ggto ggbe ggcontaminated.
Air ggforced ggdown ggthe ggdrill ggpipe... gg- ggANSWER: gg... ggclears ggdrill ggcuttings.
The ggbest ggmethod ggto ggdrill gga ggdomestic ggwater ggsupply ggwell ggin ggcavernous
gghard ggrock ggwould ggbe... gg- ggANSWER: gg... ggcable ggtool.
The ggadvantage(s) ggof ggreverse ggcirculation ggdrilling gginclude(s)... gg- ggANSWER: gg...
ggporosity ggand ggpermeability ggare ggrelatively ggundisturbed.
The ggfollowing ggdrill ggrig ggis ggthe ggleast ggacceptable ggto ggdrill ggthrough gga
ggconsolidated ggshale ggin ggsandstone ggformation... gg- ggANSWER: gg... gga ggbucket
ggrig.
(T/F) ggCable ggtool ggrigs ggare ggadvantageous ggfor ggthe ggfollowing ggreasons:
1. ggStraightness ggof ggwell.
2. ggMinimum ggmaintenance.
3. ggEconomical ggUse. gg- ggANSWER: ggTrue.
(T/F) ggDrilling ggmud ggviscosity ggcan ggbe ggaccurately ggestimated ggby ggvisual
gginspection. gg- ggANSWER: ggFalse.
Chain ggand ggdrive ggshaft ggguards... gg- ggANSWER: gg... ggshould ggbe ggkept ggin ggplace.
In ggperforming ggadjusts ggto ggcomponents ggthat ggare ggdriven ggby ggclutches ggand/or
ggdrive ggshafts, ggyou ggmust... gg- ggANSWER: gg... ggshut ggunit ggdown ggand gglock ggout
ggbefore ggadjustments ggare ggmade.
(T/F) ggA ggdrilling ggfluid ggshould ggdo ggall ggof ggthe ggfollowing:
1. ggCool ggthe ggbit.
2. ggPromote gglongevity.
3. ggRemove ggcuttings ggfrom ggthe ggbit ggsurface.
4. ggTransport ggcuttings ggto ggthe ggsurface.
5. ggPlug gglost ggcirculation ggzones.
6. ggPromote gghole ggstability. gg- ggANSWER: ggTrue.
DRILLING EXAM QUESTIONS AND
ANSWERS 2025
Artesian ggPressure ggis gggenerally... gg- ggANSWER: gg... gga ggresult ggof gggravity ggand
ggconfining ggbeds.
What ggis ggtrue ggabout ggthe ggorigin ggof ggrocks? gg- ggANSWER: gg1. ggSandstones
ggwere ggonce ggsand ggdeposits ggand ggcould gghave ggbeen ggriver ggsand, ggbeach
ggsands, ggor ggdune ggsands.
2. ggSome gglimestones ggcontain ggfossils ggbecause ggthey ggwere ggonce ggthe ggmucky
ggbottoms ggof ggshallow ggseas.
3. ggShales ggwere ggonce ggclay ggbeds.
Sedimentary ggformations ggmay ggreach ggdepths ggof gga ggmile ggor ggmore.
(T/F) ggGround ggwater, gglike ggsurface ggwater, gghas gga ggtendency ggto ggflow ggdownhill.
gg- ggANSWER: ggTrue.
The ggthree ggmain ggtypes ggof ggrock ggare... gg- ggANSWER: gg... ggigneous,
ggsedimentary, ggand ggmetamorphic.
Water ggwould ggbe ggleast gglikely ggfound ggin ggwhat gggeological ggformation? gg-
ggANSWER: ggGranite.
(T/F) ggMore ggthan gg90% ggof ggour ggnation's ggfresh ggwater ggis ggunderground? gg-
ggANSWER: ggTrue.
Prior ggto ggsetting ggthe ggrig, ggyou ggshould... gg- ggANSWER: gg1. ggMake ggsure ggthere
ggare ggno ggoverhead ggpower gglines ggwithin ggat ggleast gg20' ggof ggthe ggmast.
2. ggLocate ggall ggburied ggmaterials.
3. ggVerify ggyou ggare ggon ggthe ggright ggproperty ggand ggmeet ggthe ggcorrect ggsetback
ggrequirements.
Confined ggspace ggentry ggrules ggrequire... gg- ggANSWER: gg1. ggShoring ggof ggtrench
ggwalls ggover gg4' ggdeep.
2. ggEstablishment ggof ggbuddy ggsystem.
3. ggHave ggdriller's ggassistant ggcheck ggjacks ggas ggoperator gglevels ggrig.
, In ggsetting ggup ggand ggleveling ggthe ggrig, ggthe ggright ggprocedure ggis ggto... gg-
ggANSWER: gg1. ggUse ggsuitable ggjack ggpads ggfor ggstabilization.
2. ggPosition ggrig ggfor ggminimum ggleveling.
3. ggHave ggdriller's ggassistant ggcheck ggjacks ggas ggoperator gglevels ggrig.
(T/F) ggA ggwell ggmay ggbe ggused ggas ggsewage ggdisposal ggsite ggonly ggif ggit ggis ggcased
ggto ggthe ggbottom ggof ggthe ggborehole. gg- ggANSWER: ggFalse.
When ggconsidering ggthe ggwell ggsite, ggthe ggmore ggimportant ggthing ggto ggconsider ggis
ggthe... gg- ggANSWER: gg... ggplace ggwhere ggit ggis ggleast gglikely ggto ggbe ggcontaminated.
Air ggforced ggdown ggthe ggdrill ggpipe... gg- ggANSWER: gg... ggclears ggdrill ggcuttings.
The ggbest ggmethod ggto ggdrill gga ggdomestic ggwater ggsupply ggwell ggin ggcavernous
gghard ggrock ggwould ggbe... gg- ggANSWER: gg... ggcable ggtool.
The ggadvantage(s) ggof ggreverse ggcirculation ggdrilling gginclude(s)... gg- ggANSWER: gg...
ggporosity ggand ggpermeability ggare ggrelatively ggundisturbed.
The ggfollowing ggdrill ggrig ggis ggthe ggleast ggacceptable ggto ggdrill ggthrough gga
ggconsolidated ggshale ggin ggsandstone ggformation... gg- ggANSWER: gg... gga ggbucket
ggrig.
(T/F) ggCable ggtool ggrigs ggare ggadvantageous ggfor ggthe ggfollowing ggreasons:
1. ggStraightness ggof ggwell.
2. ggMinimum ggmaintenance.
3. ggEconomical ggUse. gg- ggANSWER: ggTrue.
(T/F) ggDrilling ggmud ggviscosity ggcan ggbe ggaccurately ggestimated ggby ggvisual
gginspection. gg- ggANSWER: ggFalse.
Chain ggand ggdrive ggshaft ggguards... gg- ggANSWER: gg... ggshould ggbe ggkept ggin ggplace.
In ggperforming ggadjusts ggto ggcomponents ggthat ggare ggdriven ggby ggclutches ggand/or
ggdrive ggshafts, ggyou ggmust... gg- ggANSWER: gg... ggshut ggunit ggdown ggand gglock ggout
ggbefore ggadjustments ggare ggmade.
(T/F) ggA ggdrilling ggfluid ggshould ggdo ggall ggof ggthe ggfollowing:
1. ggCool ggthe ggbit.
2. ggPromote gglongevity.
3. ggRemove ggcuttings ggfrom ggthe ggbit ggsurface.
4. ggTransport ggcuttings ggto ggthe ggsurface.
5. ggPlug gglost ggcirculation ggzones.
6. ggPromote gghole ggstability. gg- ggANSWER: ggTrue.
