When you feel confident that you have mastered the material in this study unit, complete the following examination. Then submit only your answers to the school for grading, using one of the examination answer options described in your “Test Materials” envelope. Send your answers for this examination as soon as you complete it. Do not wait until another examination is ready.
Questions 1–20: Select the one best answer to each question.
1. What form of resistance will you be adding to an electric lock circuit when you perform an installation?
A. Diode C. Electric lock coil
B. MOV D. Bridge rectifier
2. You’re performing an electric lock installation. The power supply is located about 300 feet from the lock’s coil. What AWG gage wire should you use?
A. 16 C. 22
B. 18 D. 28
EXAMINATION NUMBER:
03101100
Whichever method you use in submitting your exam answers to the school, you must use the number above.
For the quickest test results, go to
3. How wide should the air gap be between the face of an electromagnetic lock and the armature? A. At a minimum C. 1/ 4inch B. 1/ 8inch D. 1/2inch
4. Which one of the following statements is correct in referring to vertical panic hardware? Vertical panic hardware
A. is easier to install than horizontal panic hardware.
B. always triggers a silent or audible alarm when the bar is pressed.
C. protects doors against forcing more effectively than standard panic hardware. D. uses a single dead bolt to hold the door closed.
5. What device in an electric lock circuit changes AC voltage to DC voltage?
A. Transformer C. Fuse
B. Rectifier D. MOV
6. What device in an electric circuit protects the circuit from shorts or an overcurrent condi- tion?
A. Transformer C. Fuse
B. Rectifier D. MOV
7. Which one of the following statements is correct in referring to making resistance meas- urements with a VOM?
A. Start all resistance measurements with a resistance measurement of the incoming
electric service lines.
B. Be sure the circuit is a DC circuit before you take a measurement. AC circuits will
damage the VOM.
C. Make sure the circuit is de-energized before making any resistance measurements. D. Use a battery to power the circuit whenever taking resistance measurements.
8. Which one of the following letters is used to denote circuit current?
A. V C. R
B. E D. I
9. Your customer desires an electric lock on an interior door to a storeroom. The lock will be energized for a short period of time by a key switch with only the purchasing agent and the owner having a key. When power fails, the door should remain locked. What type of locking system should you use?
A. Intermittent duty, fail safe C. Continuous duty, fail safe B. Intermittent duty, fail secure D. Continuous duty, fail secure
10. What would be the coil resistance of an electric lock’s coil if the voltage of the current is 12 V and the current in the circuit is one-half amp?
A. 24 ohms C. 12 ohms
B. 18 ohms D. 6 ohms
11. What type of electrician’s tool or device can be used to pull wires or cables through a building?
A. Hanger bar C. Wire reel
B. Transfer loop D. Fish tape
12. What type of electric lock circuit device protects the circuit from spikes caused by the collapsing magnetic field of a DC coil?
A. Fuse C. Current limiter
B. Diode D. Solid-state switch
13. Which one of the following coil types is normally used for an audible locking system?
A. DC intermittent-duty coil C. AC intermittent-duty coil B. DC continuous-duty coil D. AC continuous-duty coil
14. You’re working on a failed electric lock circuit. A measurement at the push button switch reveals 24.07 VDC on both sides of the push button switch. What could be wrong in this circuit?
A. The electric service to the circuit is missing.
B. The transformer or the cable from the transformer is faulty. C. The transformer or the bridge rectifier is faulty.
D. Either the lock’s coil or the cable from the switch to the coil is open.
15. How much current should flow in a circuit that has an applied voltage from the power supply of 24 VDC and the coil resistance is 48 ohms?
A. 2 amps C. 3/
4amp
B. 1 amp D. 1/
2amp
16. Which one of the following statements is correct concerning AC voltage?
A. The voltage remains at a constant level with the current rising and dropping through a
cycle.
B. Both the voltage and current rise and drop through a cycle, 60 times a second. C. The current remains constant, while the voltage rises and falls 120 times a second. D. The current and voltage remain constant through each cycle.
17. What is the most likely problem when a transformer overheats?
A. A short circuit or the wrong coil is being used in the circuit B. Open switch or push button
C. Open lock coil
D. Stuck locking mechanism
18. Two locksmiths are working on a DC-powered continuous-duty lockset-type lock. The customer has been complaining that the lock goes out of operation intermittently. Lock- smith A says that the transformer or rectifier is bad. Locksmith B says that the problem is a loose connection or a bad switch contact. Who is correct?
A. Both locksmiths A and B are correct. B. Locksmith A is correct.
C. Locksmith B is correct. D. Neither locksmith is correct.
19. What is the typical resistance of an electromagnetic lock’s parallel connected coils?
A. 10 ohms C. 25 ohms
B. 12 ohms D. 50 ohms
20. What is the maximum width for a door that can be protected by standard panic hardware?
A. 48 inches C. 36 inches