NCCER 26408 Exam With Verified
Solutions
Thermostats |with |bimetal |sensing |elements |typically |use |a |combination |of |copper |or |brass |
and_________.
Elinvar®
nickel
Invar®
aluminum |- |correct |answer |-Invar®
If |lighting |units |and |other |appliances |are |also |supplied, |the |rating |of |cord- |and |plug- |connected |room |
air |conditioners |must |NOT |exceed |what |percentage |of |the |branch |circuit |rating?
10%
30%
50%
70% |- |correct |answer |-50%
Automatic |changeover |thermostats |have |a |minimum |interlock |setting, |also |known |as |the________.
differential
compensator
deadband
evaporator |- |correct |answer |-deadband
The |tubing |that |carries |heat-laden |refrigerant |gas |from |the |evaporator |to |the |compressor |is |known |as
|the |.
discharge |line
liquid |line
hot |gas |line
suction |line |- |correct |answer |-suction |line
, Which |of |the |following |principles |states |that |heat |is |created |in |one |place |and |carried |to |another |by |
means |of |air |or |water?
Heat-creation |principle
Heat-transfer |principle
Heat-movement |principle
Heat-transplant |principle |- |correct |answer |-Heat-transfer |principle
A |freezestat |is |a |.
normally |closed |switch
normally |open |switch
digital |control
thermostat |that |has |seized |- |correct |answer |-normally |closed |switch
Which |of |the |following |occurs |as |soon |as |a |heating |thermostat |is |closed?
The |flame |rollout |switchopens.
The |blower |fan |starts.
The |inducer |fan |starts.
The |inducer |pressure |switch |opens. |- |correct |answer |-The |inducer |fan |starts.
A |conventional |thermostat |should |NOT |be |thrown |into |the |regular |trash |because |it |.
may |contain |mercury
is |easy |to |repair
has |a |10-year |warranty
contains |sulfuric |acid |- |correct |answer |-may |contain |mercury
The |MOST |widely |used |fossil |fuel |is |.
coal
fuel |oil
Solutions
Thermostats |with |bimetal |sensing |elements |typically |use |a |combination |of |copper |or |brass |
and_________.
Elinvar®
nickel
Invar®
aluminum |- |correct |answer |-Invar®
If |lighting |units |and |other |appliances |are |also |supplied, |the |rating |of |cord- |and |plug- |connected |room |
air |conditioners |must |NOT |exceed |what |percentage |of |the |branch |circuit |rating?
10%
30%
50%
70% |- |correct |answer |-50%
Automatic |changeover |thermostats |have |a |minimum |interlock |setting, |also |known |as |the________.
differential
compensator
deadband
evaporator |- |correct |answer |-deadband
The |tubing |that |carries |heat-laden |refrigerant |gas |from |the |evaporator |to |the |compressor |is |known |as
|the |.
discharge |line
liquid |line
hot |gas |line
suction |line |- |correct |answer |-suction |line
, Which |of |the |following |principles |states |that |heat |is |created |in |one |place |and |carried |to |another |by |
means |of |air |or |water?
Heat-creation |principle
Heat-transfer |principle
Heat-movement |principle
Heat-transplant |principle |- |correct |answer |-Heat-transfer |principle
A |freezestat |is |a |.
normally |closed |switch
normally |open |switch
digital |control
thermostat |that |has |seized |- |correct |answer |-normally |closed |switch
Which |of |the |following |occurs |as |soon |as |a |heating |thermostat |is |closed?
The |flame |rollout |switchopens.
The |blower |fan |starts.
The |inducer |fan |starts.
The |inducer |pressure |switch |opens. |- |correct |answer |-The |inducer |fan |starts.
A |conventional |thermostat |should |NOT |be |thrown |into |the |regular |trash |because |it |.
may |contain |mercury
is |easy |to |repair
has |a |10-year |warranty
contains |sulfuric |acid |- |correct |answer |-may |contain |mercury
The |MOST |widely |used |fossil |fuel |is |.
coal
fuel |oil
