Hello, I'm not sure if my answers are correct. Can someone review my work to make sure its right. My answers are marked with an *.
1. What is the typical no-load speed of a high-speed drill?
A. 1,000 rpm
*B. 2,500 rpm
C. 3,000 rpm
D. 3,500 rpm
2. Why should you be especially careful when removing the brush caps from a circular saw or other power tool with external phenolic brush caps?
A. To prevent scratching the brushes in their holders
B. To prevent deforming the brush holder
*C. To prevent breaking the fragile brush caps
D. To prevent bending the retaining springs
3. Which of the following power tools does NOT use a chuck?
A. Hammer drill
B. Power driver
C. High-torque drill
*D. Power screwdriver
4. What type of bearings are used to support the spindle on most table saws?
A. Sleeve
B. Roller
C. Thrust
*D. Pillow block
5. What type of bearing can be used at a drill's or power driver's spindle to absorb a large load inward against the chuck?
A. Thrust
B. Roller
*C. Ball
D. Sleeve
6. The end of the motor shaft on a router is threaded to accept a
A. chuck.
B. driver.
*C. collet.
D. clamping nut.
7. What is the purpose of the external jumper wire on a variable-speed reversing drill switch?
A. To short the brushes together when the switch is released
B. To short the field windings together when the switch is released
*C. To form one-half of a cross-connection system
D. To carry the ground across the switch to the motor
8. Which one of the following gear types is commonly used on residential-type circular saws?
A. Direct
*B. Spur or helical
C. Bevel
D. Worm
9. What type of clutch is used in a hammer drill to enable or disable the spindle drive's final reduction gearing?
A. Friction disk
B. Steel ball
C. Electric cam
*D. Tapered jaw
10. The device used in an air compressor to provide a one-way path for airflow is a
*A. poppet valve.
B. relief valve.
C. vane.
D. shell.
11. Orbital motion in a sander is created by a
A. direct-drive counterweight.
*B. flexible coupled counterweight.
C. eccentric gear and pin.
D. unbalanced gear drive.
12. What is the purpose of a diode in a cordless drill or power screwdriver?
A. To rectify battery voltage
B. To regulate battery power
*C. To prevent reverse charging of the batteries
D. To provide a reverse direction at the switch
13. The type of motor used on cordless ratchets and other cordless tools is the
A. shaded-pole motor.
B. split-phase motor.
C. universal motor.
*D. permanent-magnet motor.
14. What device or method is used on some types of jigsaws to dampen the vibrations caused by the moving rod or shaft?
A. Elastic mounting of the lower bearing
*B. An eccentric counterweight
C. An offset wobble plate
D. A control block
15. What final electrical test should always be performed on power tools, especially those power tools with a metal case, like circular saws?
*A. A leakage test
B. A current test
C. A motor resistance test
D. A line cord continuity test
16. What device is used on a power tool's universal motor to provide a burnout-proof motor?
A. Fuse
B. Circuit breaker
*C. Thermal protector
D. Current relay
17. How is the light bulb powered in a router circuit?
A. Directly from the AC line cord
B. Indirectly from a switch contact
*C. From a tap on a field coil
D. From a brush holder contact
18. How is the two-speed feature of a DC cordless drill constructed?
A. A two-speed switch selects between resistors connected in series with the motor.
*B. A two-speed switch selects between full battery voltage or a tap in the battery pack.
C. A two-speed switch connects the batteries to two different field windings.
D. The ON/OFF switch has two contacts that are enabled depending upon the amount the trigger is depressed.
19. How are many circular saw motors rated instead of using a horsepower rating?
A. Watts
B. Torque
*C. Amperes
D. Poles
20. What is the major difference between a high-speed and a high-torque drill?
A. Chuck type
B. Line cord gage
*C. Output speed
D. Brush thickness
21. The component that clamps around the rod or shaft of a jigsaw and connects to the eccentric pin and bearing is the
*A. yoke.
B. sleeve.
C. detent plate.
D. plunger.
22. What is the common voltage for a cordless drill battery cell?
A. 1.0 VDC
*B. 1.2 VDC
C. 1.5 VDC
D. 2.0 VDC
23. If the primary gear ratio in a drill is 4:1 and a secondary gear ratio is also 4:1, what is the overall gear ratio of the drill?
A. 4:1
B. 8:1
C. 12:1
*D. 16:1
24. Why are the sensors or encoders used on electronic measuring systems two-channel devices?
A. To prevent the loss of measurement in the event of a channel failure
B. To provide twice the signal strength of single-channel devices
*C. To identify the direction of movement
D. To provide twice the signal voltage of a single channel sensor
25. What part most commonly fails in an electric drill or power driver?
*A. Switch
B. Bearing
C. Field coil
D. Armature
Can someone help me, Please!
Sure, I can review your answers. Let's go through each question and answer.
1. The correct answer is B. 2,500 rpm. To determine the typical no-load speed of a high-speed drill, you can refer to the product specifications or manual provided by the manufacturer.
2. The correct answer is C. To prevent breaking the fragile brush caps. When removing the brush caps from a circular saw or other power tools with external phenolic brush caps, you should be careful to avoid breaking them.
3. The correct answer is D. Power screwdriver. Power screwdrivers do not typically use a chuck to hold the bits. Instead, they often have a dedicated slot or mechanism for inserting and holding the screwdriver bits.
4. The correct answer is D. Pillow block. Most table saws use pillow block bearings to support the spindle.
5. The correct answer is C. Ball. Ball bearings can be used at a drill's or power driver's spindle to absorb a large load inward against the chuck.
6. The correct answer is C. collet. The end of the motor shaft on a router is threaded to accept a collet, which holds the router bit in place.
7. The correct answer is C. To form one-half of a cross-connection system. The external jumper wire on a variable-speed reversing drill switch is part of a cross-connection system that allows for variable speed control and reversing functionality.
8. The correct answer is B. Spur or helical. Spur or helical gears are commonly used on residential-type circular saws.
9. The correct answer is D. Tapered jaw. A tapered jaw clutch is commonly used in a hammer drill to enable or disable the spindle drive's final reduction gearing.
10. The correct answer is A. poppet valve. A poppet valve is used in an air compressor to provide a one-way path for airflow.
11. The correct answer is B. flexible coupled counterweight. Orbital motion in a sander is created by a flexible coupled counterweight.
12. The correct answer is C. To prevent reverse charging of the batteries. A diode is used in a cordless drill or power screwdriver to prevent reverse charging of the batteries.
13. The correct answer is D. permanent-magnet motor. Cordless ratchets and other cordless tools often use permanent-magnet motors.
14. The correct answer is B. An eccentric counterweight. Some types of jigsaws use an eccentric counterweight to dampen vibrations caused by the moving rod or shaft.
15. The correct answer is A. A leakage test. A leakage test should always be performed on power tools, especially those with a metal case, to ensure there are no electrical faults or potential safety hazards.
16. The correct answer is C. Thermal protector. A thermal protector is used on a power tool's universal motor to provide a burnout-proof motor by automatically shutting off the motor if it becomes too hot.
17. The correct answer is C. From a tap on a field coil. The light bulb in a router circuit is powered from a tap on a field coil.
18. The correct answer is B. A two-speed switch selects between full battery voltage or a tap in the battery pack. The two-speed feature of a DC cordless drill is constructed by using a two-speed switch to select between full battery voltage or a tap in the battery pack.
19. The correct answer is C. Amperes. Many circular saw motors are rated in terms of amperes instead of using a horsepower rating.
20. The correct answer is C. Output speed. The major difference between a high-speed and a high-torque drill is the output speed.
21. The correct answer is A. yoke. The component that clamps around the rod or shaft of a jigsaw and connects to the eccentric pin and bearing is called the yoke.
22. The correct answer is B. 1.2 VDC. The common voltage for a cordless drill battery cell is typically 1.2 VDC.
23. The correct answer is D. 16:1. To calculate the overall gear ratio of the drill, you multiply the primary gear ratio (4:1) by the secondary gear ratio (4:1), resulting in an overall gear ratio of 16:1.
24. The correct answer is C. To identify the direction of movement. Sensors or encoders used on electronic measuring systems are two-channel devices to accurately identify the direction of movement.
25. The correct answer is A. Switch. The switch is the part that commonly fails in an electric drill or power driver.