Mechanics Exams Questions with 100%
Elaborations
.An .MOV .burns .out, .you .replace .it .but .cannot .read .voltage .or .resistance. .What .should .you .do? .-
.(correct .answer) .-Replace .it .with .a .larger .one .(630)
.On .a .Ward-Leonard .circuit, .the .brake .is .set .but .the .motor .is .trying .to .slip .through .the .brake. .What
.circuit .is .the .issue? .- .(correct .answer) .-Suicide .circuit .(425)
.A .Hydro .runs .up .with .no .load .but .does .not .run .up .with .a .full .load. .What .is .the .issue? .- .(correct
.answer) .-The .relief .valve .is .set .too .low .(805)
.Runby .for .a .1:1 .car .hits .the .CWT .buffer .4" .below .the .top .landing. .The .CWT .runby .should .be .set .at
.18". .How .much .should .the .ropes .be .shortened? .- .(correct .answer) .-22" .for .1:1. .
For .a .2:1 .with .the .same .issue .is .44".
.You .need .to .work .on .a .freight .door .retiring .cam. .You .LOTO .the .mainline .disconnect .but .there .is
.still .power .to .the .cam. .What .circuit .is .still .hot? .- .(correct .answer) .-Mainline .disconnect .(535)
** .The .contractor .requests .that .the .vertical .center .of .the .Rack .and .Pinion .hoist .be .moved. .How .is
.this .accomplished? .- .(correct .answer) .-Adjust .Tie .downs/Wall .ties .(805)
** .Working .pressure .on .a .Hydro .is .400 .PSI. .What .is .the .correct .Relief .Valve .Setting? .- .(correct
.answer) .-600 .PSI .Max. .(805)
400 .psi .x .150% .= .600 .psi
** .A .contractor .wants .to .raise .the .car .speed .from .100 .FPM .to .125 .FPM. .It .currently .has .a .12"
.sheave. .What .size .sheave .is .required? .- .(correct .answer) .-15"
(125 ./100 .= .1.25 .1.25 .x .12 .= .15)
.There .is .slight .arcing .at .the .Brushes .and .Commutator. .What .actions .must .be .taken? .- .(correct
.answer) .-None. .(430)
"Heavy .arcing .is .due .to .light .brush .pressure. .Mechanical .wear .indicates .heavy .brush .pressure.
.How .much .resistance .is .normally .measured .across .a .normally .closed .switch .? .- .(correct .answer) .-
1.2 .ohms .or .1 .to .2 .ohms
** .A .car .traveling .in .the .hoistway .always .stops .at .the .same .point .and .blows .a .fuse. .What .is .the
.problem? .- .(correct .answer) .-Traveling .cable .has .a .cut .or .short
** .How .is .a .Class .1 .(yearly) .buffer .test .performed? .- .(correct .answer) .-At .slow .speed .and .the .buffer
.must .return .in .90 .seconds. .(555) .*(60 .seconds .is .acceptable) .(90 .seconds .is .code)
, 5 .year .test .(Class .5) .is .car .at .rated .load .and .speed. .Buffer .must .return .in .90 .seconds. .CWT .at .rated
.speed .and .buffer .must .return .in .90 .seconds.
** .How .many .Strain .Supports .are .required .on .a .350' .raceway? .- .(correct .answer) .-4
One .for .every .100'
.How .is .Stainless .steel .drilled .out? .- .(correct .answer) .-Slow .speed .and .constant .pressure .(205)
.What .are .the .required .amount .of .clips .for .Wedge .Shackles .and .what .is .their .spacing? .- .(correct
.answer) .-At .least .2, .with .the .first .being .4 .times .the .diameter .of .the .rope .from .the .top .of .shackle. .
Second .is .8 .times .the .diameter .of .the .rope .from .the .first.* .Car .is .loaded .with .125% .and .sinks.
.Why? .- .(correct .answer) .-Slipped .through .the .brake.
.A .300 .Ohm .resistor .burns .out. .You .don't .have .a .300 .Ohm .resistor .to .replace .it. .What .can .you .use
.to .make .up .the .resistor? .- .(correct .answer) .-2 .600 .Ohms .resistors .in .Parallel. ."The .resistance .is .half
.of .the .highest .rating .in .a .parallel .circuit. .
3, .225 .Ohm .resistors .in .parallel .equal .75 .Ohms.
** .A .480 .VAC .Step .Down .Transformer .is .connected .to .a .3 .phase .rectifier. .What .will .the .output .be?
.- .(correct .answer) .-320 .VDC
480 .- .33.33% .= .320
.If .you .find .a .broken .or .missing .barricade, .what .do .you .do? .- .(correct .answer) .-Write .up .a .formal
.inspection .request.
.If .a .Dumbwaiter .has .9 .square .feet .in .Area, .
4 .' .High .and .the .rated .Capacity .is .13.9 .lb/ft3, .what .is .the .total .capacity? .- .(correct .answer) .-500
.lb/ft3. .
"The .area .of .a .Dumbwaiter .is .9 .sq' .max .and .is .4' .High. .Multiply .that .by .13.9. .
9x4 .= .36. .36 .x .13.9 .= .500
** .What .are .the .consequences .of .a .misaligned .Rack .and .Pinion .hoist .joint? .- .(correct .answer) .-
Broken .Gear .Teeth .(850) .Motor .not .aligned.
** .You .enter .a .Pit .where .toxic .fumes .are .present. .How .do .you .proceed? .- .(correct .answer) .-Follow
.proper .procedures. .
"Confined .Space .entry .procedures .are .now .guided .by .OSHA .for .pit .entry".
** .When .changing .a .1:1 .car .rated .at .600 .FPM .and .2000 .lb .capacity .to .a .2:1, .what .will .the .new
.ratings .be? .- .(correct .answer) .-300 .FPM .and .4000 .lb .capacity. .
Elaborations
.An .MOV .burns .out, .you .replace .it .but .cannot .read .voltage .or .resistance. .What .should .you .do? .-
.(correct .answer) .-Replace .it .with .a .larger .one .(630)
.On .a .Ward-Leonard .circuit, .the .brake .is .set .but .the .motor .is .trying .to .slip .through .the .brake. .What
.circuit .is .the .issue? .- .(correct .answer) .-Suicide .circuit .(425)
.A .Hydro .runs .up .with .no .load .but .does .not .run .up .with .a .full .load. .What .is .the .issue? .- .(correct
.answer) .-The .relief .valve .is .set .too .low .(805)
.Runby .for .a .1:1 .car .hits .the .CWT .buffer .4" .below .the .top .landing. .The .CWT .runby .should .be .set .at
.18". .How .much .should .the .ropes .be .shortened? .- .(correct .answer) .-22" .for .1:1. .
For .a .2:1 .with .the .same .issue .is .44".
.You .need .to .work .on .a .freight .door .retiring .cam. .You .LOTO .the .mainline .disconnect .but .there .is
.still .power .to .the .cam. .What .circuit .is .still .hot? .- .(correct .answer) .-Mainline .disconnect .(535)
** .The .contractor .requests .that .the .vertical .center .of .the .Rack .and .Pinion .hoist .be .moved. .How .is
.this .accomplished? .- .(correct .answer) .-Adjust .Tie .downs/Wall .ties .(805)
** .Working .pressure .on .a .Hydro .is .400 .PSI. .What .is .the .correct .Relief .Valve .Setting? .- .(correct
.answer) .-600 .PSI .Max. .(805)
400 .psi .x .150% .= .600 .psi
** .A .contractor .wants .to .raise .the .car .speed .from .100 .FPM .to .125 .FPM. .It .currently .has .a .12"
.sheave. .What .size .sheave .is .required? .- .(correct .answer) .-15"
(125 ./100 .= .1.25 .1.25 .x .12 .= .15)
.There .is .slight .arcing .at .the .Brushes .and .Commutator. .What .actions .must .be .taken? .- .(correct
.answer) .-None. .(430)
"Heavy .arcing .is .due .to .light .brush .pressure. .Mechanical .wear .indicates .heavy .brush .pressure.
.How .much .resistance .is .normally .measured .across .a .normally .closed .switch .? .- .(correct .answer) .-
1.2 .ohms .or .1 .to .2 .ohms
** .A .car .traveling .in .the .hoistway .always .stops .at .the .same .point .and .blows .a .fuse. .What .is .the
.problem? .- .(correct .answer) .-Traveling .cable .has .a .cut .or .short
** .How .is .a .Class .1 .(yearly) .buffer .test .performed? .- .(correct .answer) .-At .slow .speed .and .the .buffer
.must .return .in .90 .seconds. .(555) .*(60 .seconds .is .acceptable) .(90 .seconds .is .code)
, 5 .year .test .(Class .5) .is .car .at .rated .load .and .speed. .Buffer .must .return .in .90 .seconds. .CWT .at .rated
.speed .and .buffer .must .return .in .90 .seconds.
** .How .many .Strain .Supports .are .required .on .a .350' .raceway? .- .(correct .answer) .-4
One .for .every .100'
.How .is .Stainless .steel .drilled .out? .- .(correct .answer) .-Slow .speed .and .constant .pressure .(205)
.What .are .the .required .amount .of .clips .for .Wedge .Shackles .and .what .is .their .spacing? .- .(correct
.answer) .-At .least .2, .with .the .first .being .4 .times .the .diameter .of .the .rope .from .the .top .of .shackle. .
Second .is .8 .times .the .diameter .of .the .rope .from .the .first.* .Car .is .loaded .with .125% .and .sinks.
.Why? .- .(correct .answer) .-Slipped .through .the .brake.
.A .300 .Ohm .resistor .burns .out. .You .don't .have .a .300 .Ohm .resistor .to .replace .it. .What .can .you .use
.to .make .up .the .resistor? .- .(correct .answer) .-2 .600 .Ohms .resistors .in .Parallel. ."The .resistance .is .half
.of .the .highest .rating .in .a .parallel .circuit. .
3, .225 .Ohm .resistors .in .parallel .equal .75 .Ohms.
** .A .480 .VAC .Step .Down .Transformer .is .connected .to .a .3 .phase .rectifier. .What .will .the .output .be?
.- .(correct .answer) .-320 .VDC
480 .- .33.33% .= .320
.If .you .find .a .broken .or .missing .barricade, .what .do .you .do? .- .(correct .answer) .-Write .up .a .formal
.inspection .request.
.If .a .Dumbwaiter .has .9 .square .feet .in .Area, .
4 .' .High .and .the .rated .Capacity .is .13.9 .lb/ft3, .what .is .the .total .capacity? .- .(correct .answer) .-500
.lb/ft3. .
"The .area .of .a .Dumbwaiter .is .9 .sq' .max .and .is .4' .High. .Multiply .that .by .13.9. .
9x4 .= .36. .36 .x .13.9 .= .500
** .What .are .the .consequences .of .a .misaligned .Rack .and .Pinion .hoist .joint? .- .(correct .answer) .-
Broken .Gear .Teeth .(850) .Motor .not .aligned.
** .You .enter .a .Pit .where .toxic .fumes .are .present. .How .do .you .proceed? .- .(correct .answer) .-Follow
.proper .procedures. .
"Confined .Space .entry .procedures .are .now .guided .by .OSHA .for .pit .entry".
** .When .changing .a .1:1 .car .rated .at .600 .FPM .and .2000 .lb .capacity .to .a .2:1, .what .will .the .new
.ratings .be? .- .(correct .answer) .-300 .FPM .and .4000 .lb .capacity. .
