Myanmar Industrial, Agricultural and Livestock Matriculation: Industrial (Mechanical) Stream

Which timber defect is caused by fungal decay under persistently damp conditions?

• ACup shake
• BDry rot
• CTwisting
• DHeart shake

How are courses arranged in standard English-bond brick masonry?

• AHeaders and stretchers alternate within every course
• BCourses of headers alternate with courses of stretchers
• CThree header courses alternate with one stretcher course
• DEvery brick is laid vertically as a soldier

In tubular scaffolding, what are the horizontal members that run parallel to the wall and connect vertical standards?

• AStandards
• BLedgers
• CTransoms
• DSole plates

Which shallow foundation forms one reinforced-concrete slab beneath most or all of a building footprint?

• AIsolated pad footing
• BRaft or mat foundation
• CStrip footing
• DUnder-reamed pile

In differential leveling, what does height of instrument (HI) mean?

• ATripod height above local ground
• BElevation of the line of sight above the chosen datum
• CDifference between a foresight and backsight
• DDistance from objective lens to crosshair

A benchmark has elevation 50.000 m. A backsight on it is 1.450 m, and an intermediate sight on point A is 2.150 m. What is A's reduced level?

• A49.300 m
• B50.700 m
• C51.450 m
• D53.600 m

From one level setup, the staff reading on P is 2.800 m and the reading on Q is 1.600 m. What is the elevation change from P to Q?

• AA fall of 1.200 m
• BA rise of 1.200 m
• CA fall of 4.400 m
• DNo change

Two road-centerline stations are 80 m apart horizontally and differ in elevation by 4 m. What is the gradient?

• A1 in 20 (5.0%)
• B1 in 25 (4.0%)
• C1 in 16 (6.25%)
• D1 in 32 (3.125%)

A heating element connected to 230 V draws 5 A. What is its resistance?

• A23 Ω
• B46 Ω
• C115 Ω
• D1,150 Ω

A control circuit places a 24 Ω indicator branch in parallel with a 48 Ω relay branch. What equivalent resistance does the source see?

• A16 Ω
• B24 Ω
• C36 Ω
• D72 Ω

An ideal transformer has 800 primary turns and 200 secondary turns. With 240 V across the primary, what is the open-circuit secondary voltage?

• A60 V
• B120 V
• C480 V
• D960 V

A workshop fan uses a six-pole induction motor on a 50 Hz supply. What is the stator field's synchronous speed?

• A750 rpm
• B1,000 rpm
• C1,500 rpm
• D3,000 rpm

A motor's synchronous speed is 1,500 rpm and its loaded rotor speed is 1,440 rpm. What is the slip?

• A2%
• B4%
• C6%
• D8%

A pump motor is designed to run in delta, starts without a heavy mechanical load, and causes an excessive supply-voltage dip under direct-on-line starting. Why might a star-delta starter be selected?

• ATo triple starting torque
• BTo reduce starting line current and starting torque compared with direct-on-line starting
• CTo reverse rotation automatically during acceleration
• DTo replace overload and short-circuit protection

A metric vernier has 50 divisions spanning 49 mm of the main scale. What is its least count?

• A0.10 mm
• B0.05 mm
• C0.02 mm
• D0.01 mm

A metric micrometer shows 12.5 mm on its sleeve and the 24th 0.01 mm thimble division aligns with the datum line. What is the reading?

• A12.24 mm
• B12.74 mm
• C12.84 mm
• D13.24 mm

A 50 mm shaft is turned at a cutting speed of 30 m/min. Using N = 1,000V/(πD), what spindle speed is required?

• A95 rpm
• B191 rpm
• C382 rpm
• D600 rpm

A taper has major diameter 48 mm, minor diameter 40 mm, and length 50 mm. What compound-rest half-angle satisfies tan α = (D − d)/(2L)?

• Atan α = 0.080, α ≈ 4.57°
• Btan α = 0.160, α ≈ 9.09°
• Ctan α = 0.040, α ≈ 2.29°
• Dtan α = 0.800, α ≈ 38.66°

Which oxy-acetylene flame is normally selected for welding mild steel?

• ACarburizing flame
• BNeutral flame
• COxidizing flame
• DAir-acetylene flame

A fabricator needs precise control and a clean weld on thin stainless-steel sheet, using a non-consumable tungsten electrode and separately added filler when required. Which process fits?

• AShielded metal arc welding
• BGas tungsten arc welding (GTAW/TIG)
• CSubmerged arc welding
• DFlux-cored arc welding

Which condition most directly promotes porosity in a weld bead?

• AClean, dry joint faces and sound shielding
• BMoisture, oil, rust, or disrupted shielding that introduces gas into the molten pool
• CCorrectly stored low-hydrogen electrodes
• DAdequate removal of oxide and scale before welding

Which nondestructive test uses capillary action to reveal surface-breaking flaws in a nonporous material?

• ALiquid penetrant testing
• BRadiographic testing
• CUltrasonic testing
• DMagnetic-flux leakage testing

A drawing places the top view below the front view and the left-side view to the right of it. Which projection convention is being used?

• AFirst-angle projection
• BThird-angle projection
• COblique projection
• DIsometric projection

How are section lines normally drawn through a solid metal part in an engineering sectional view?

• AThin continuous, evenly spaced lines commonly inclined at 45°
• BThick dashed vertical lines
• CA solid black fill over every cut surface
• DCenterlines drawn through only the outer boundary

A hole is specified as 40.000 +0.025/−0.000 mm. What are its upper limit, lower limit, and tolerance?

• A40.025 mm, 40.000 mm, 0.025 mm
• B40.050 mm, 39.975 mm, 0.075 mm
• C40.000 mm, 39.975 mm, 0.025 mm
• D40.250 mm, 40.000 mm, 0.250 mm

What value is printed by this pseudocode? SET total TO 0 FOR n FROM 1 TO 4 SET total TO total + n END FOR PRINT total

• A4
• B6
• C10
• D16