nate math exam questions 20222023 | consisting of 50 questions with verified answers from experts
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NATE Math Exam Questions And Answers 2022/2023
1. A heating system has an input of 100,000 btuh with an output of
75,000 btuh. What is its efficiency in percent?
A: 100%
B: 80%
C: 75%
D: 70%: Answer- C: 75%
Output/Input X 100 =
% 75,000/100,000 X
100 = %
.75 X 100 = 75%
2. A motor has a power factor of .69, a voltage rating of 230 volts, 3-phase
and an efficiency rating of 88% with an SF rating of 1.15. Which of these
ratings relates to the phase angle between the current and the voltage?
A: Power
factor B:
Voltage
,C: Phase
D: SF: Answer- A: Power factor
3. The decimal equivalent of the mixed fraction 3 7D8
is: A: 3.125
B: 3.375
C: 3.75
D: 3.875: Answer- D: 3.875
7/8 = .875 + 3 = 3.875
4. The number on the top of a fraction is called:
,A: Quotient
B:
Numerator
C: Denominator
D: Divisor: Answer- B: Numerator
5. The number on the bottom of a fraction is called:: Denominator
6. Air balancing reports generally round off all cfm air flow rates to the
nearest 5 cfm. An airflow measurement of 348.3 cfm will then be
rounded off to which of the following?
A: 340 cfm
B: 345 cfm
C: 348 cfm
D: 350 cfm: Answer- D: 350 cfm
7. A technician is using a U-tube manometer to measure a pressure
differ- ential. One side of the U-tube water level is at .75". The opposite
side of the U-tube reads .75". What is the pressure differential in inches?
A: .75"
B: 1.25"
C: 1.5"
D: 1.75": Answer- C: 1.5"
, 8. A technician calculates the bill for a service call to be a total of
$269.60. The sales tax rate is 5%. How much is the sales tax for the bill?
A:
$13.48
B:
$14.67
C:
$26.96
D: $283.08: A: $13.48
269.60 X .05 = $13.48
9. The velocity in fpm is equal to the square root of the velocity pressure
times the factor 4005. A technician measures a velocity pressure of .25.
What is the square root of .25?
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