AIT Technical Skills & Application 4

Question 1

A journeyman sheet metal worker is laying out a flat pattern for a 90-degree elbow. The K-factor in bend allowance calculations represents what?

Accepted Answer

The ratio that locates the neutral axis position within the metal thickness

Answer

The K-factor is a ratio (typically 0.25–0.50) that defines where the neutral axis lies within the material thickness, which determines how much metal is consumed in the bend.

Question 2

When testing an electrical circuit with a clamp-on ammeter, what is the correct procedure for measuring current in a two-wire (line and neutral) cable?

Accepted Answer

Clamp around only one conductor — either the hot or the neutral

Answer

Clamping around only one conductor measures the current in that conductor; clamping both simultaneously causes the fields to cancel and reads near zero.

Question 3

A construction carpenter is calculating the rise and run for a staircase. If the total rise is 8 feet 9 inches and the maximum riser height per IBC is 7 inches, what is the minimum number of risers required?

Accepted Answer

15

Answer

Total rise = 105 inches; 105 ÷ 7 = exactly 15 risers, which meets the maximum 7-inch riser height requirement.

Question 4

In refrigeration, what condition does a very high superheat reading at the evaporator outlet typically indicate?

Accepted Answer

A restriction in the liquid line or insufficient refrigerant flow through the metering device

Answer

High superheat means refrigerant boiled off early in the evaporator with a long dry section, indicating starvation from low refrigerant charge, a restricted liquid line, or an under-feeding TXV.

Question 5

Which property of a cutting tool material is most critical for high-speed dry machining of hardened steel?

Accepted Answer

Hot hardness — the ability to retain hardness at elevated cutting temperatures

Answer

During high-speed dry cutting, tool tip temperatures can exceed 1000°F; hot hardness (retained hardness at temperature) is the critical property that prevents rapid tool wear.

(AIT) Apprenticeship and Industry Training Practice Test

(AIT) Apprenticeship and Industry Training Practice Test

AIT Technical Skills & Application 4