National Elevator Industry Educational Program 610 Questions and Answers
a brake coil has a normal resistance of 50 ohms and operates at 125 volts. what is the current? - ans2.5 amps
a circuit with parallel branches has 200 ohms in one branch and 300 ohms in the other, what is the total
resistance? - ans1200 ohms
a resistor of what power rating including a safety factor would be needed to replace a resistor in a circuit
operating with a 125v voltage drop and 1 amp of current? - ans250 w
circuit breakers and fuses are rated for which of the following? - ansvoltage, current and time delay
if a circuit that has a 5 amp fuse and a normally carries 2 amps was to short, causing the current to double,
what would happen to the fuse? - ansthe fuse would hold the load
the bands from left to right on a resistor indicate the numbers 5,4 and 2. what its value? - ans5,400 ohms
the characteristic of a resistor that indicates the acceptable deviation of value from the indicated value is called
which of the following? - anstolerance
the standard notation for switch contacts include which of the following? - ansnumber of pulls, number of fixed
contacts per pole
three parallel branches of a circuit measure 6,4, and 2 amps. what is the total current? - ans12 amps
what are the acceptable limits of deviation of resistance for 4.7k resistor rated at 5%? - ans4.465k and 4.935k
what can add a extra layer of safety when using power tools? - ansGFI's
a brake coil has a normal resistance of 50 ohms and operates at 125 volts. what is the current? - ans2.5 amps
a circuit with parallel branches has 200 ohms in one branch and 300 ohms in the other, what is the total
resistance? - ans1200 ohms
a resistor of what power rating including a safety factor would be needed to replace a resistor in a circuit
operating with a 125v voltage drop and 1 amp of current? - ans250 w
circuit breakers and fuses are rated for which of the following? - ansvoltage, current and time delay
if a circuit that has a 5 amp fuse and a normally carries 2 amps was to short, causing the current to double,
what would happen to the fuse? - ansthe fuse would hold the load
the bands from left to right on a resistor indicate the numbers 5,4 and 2. what its value? - ans5,400 ohms
the characteristic of a resistor that indicates the acceptable deviation of value from the indicated value is called
which of the following? - anstolerance
the standard notation for switch contacts include which of the following? - ansnumber of pulls, number of fixed
contacts per pole
three parallel branches of a circuit measure 6,4, and 2 amps. what is the total current? - ans12 amps
what are the acceptable limits of deviation of resistance for 4.7k resistor rated at 5%? - ans4.465k and 4.935k
what can add a extra layer of safety when using power tools? - ansGFI's
