21. Which pair of pins are coils for 11 pins relay?
a. 5 and 7
b. 8 and 9
c. 2 and 10
d. 1 and 11
22. Which pair of pins are NO Contact for 11 pins Relay?
a. 11 and 8
b. 1 and 4
c. 5 and 6
d. 11 and 9
23. 1 and 7 are _ of an 8 pins relay?
a. NO Contact
b. Coil
c. NC Contact
d. None of These
24. 5 and 7 are _ of an 8 pins relay?
a. NO Contact
b. Coil
c. NC Contact
d. None of These
25. 4 and 5 are _ of an 8 pins relay?
a. NO Contact
b. Coil
c. NC Contact
d. None of These
26. 11 and 1 are _ of an 11 pins relay?
a. NO Contact
b. Coil
c. NC Contact
d. None of These
27. 3 and 6 are _ of an 8 pins relay?
a. NO Contact
b. Coil
c. NC Contact
d. None of These
28. ___ switches are found throughout industry in applications where it is necessary to sense the pressure of pneumatic or hydraulic
systems.
a. Pressure
b. Limit
c. Float
d. Light
29. ____ switches are used to detect when an object is present or absent from a particular location.
a. Pressure
b. Limit
c. Float
d. Light
30. Control circuits can be divided into two major types: ___ and ____
a. 2 wire Control and 3 Wire Control
b. 4 wire Control and 3 Wire Control
c. 3 wire Control and 5 Wire Control
d. None of These
31. The direction of rotation of any three-phase motor can be reversed by changing any _ motor T leads.
a. 1
b. 2
c. 3
d. 4
32. ____ prevents some action from taking place until some other action has been performed.
a. Rotational
b. Interlocking
c. Latching
d. Locking
33. _______ interlocking is accomplished by using the contactors to operate a mechanical lever that prevents the other contactor
from closing while one is energized.
a. Mechanical
b. Electrical
c. Electronic
d. Device
34. Which of the motor below cannot be reversed.
a. DC Motor
b. Single Phase Motor
c. 3 Phase Motor
d. None of these
35. the quickly repeated closure of a circuit to start a motor from rest for the purpose of accomplishing small movements of the
driven machine.
a. Inching
b. Start-Stop
c. Jogging
d. Forward Reverse
36. ___ control is characterized by the use of push buttons, limit switches, pressure switches, and other sensing devices to control
the operation of a magnetic contactor or starter.
a. Manual
b. Semi-Manual
c. Semi-Automatic
d. Automatic
37. Motors typically have a current draw of 300% to __ of motor full load current when they start.
a. 600 %
b. 700 %
c. 800 %
d. 900 %
38. Electronic overload relays employ a __ to sense the motor current. The conductor that supplies power to the motor passes
through the core of a toroid transformer.
a. Ammeter
b. Current Sensor
c. Current Transformer
d. Voltmeter
39. ___ control is very similar to semiautomatic control in that pilot sensing devices are employed to operate a magnetic contactor
or starter that
actually controls the motor.
a. Manual
b. Semi-Manual
c. Semi-Automatic
d. Automatic
40. There are some basic functions that motor control systems perform. Which is not?
a. Starting
b. Surge Protection
c. Forward Reverse
d. Stopping
e. Jogging or Inching
41. Fuses and circuit breakers are generally employed for __, and overload relays are used to protect the motor.
a. Motor Protection
b. Circuit Protection
c. Equipment Protection
d. All of the Above
42. They operate on the solenoid principle. A coil of wire is connected to an electric current. The magnetic field developed by the
current is concentrated in an iron pole piece.
a. Motor
b. Relay and Contactors
c. Overload Relay
d. Circuit Breaker
43. Solder melting type overloads are often called __.
a. Solder Pot Overload
b. Melting alloy thermal
overload
c. Dual element thermal
overload
d. Time delay thermal
overload
44. NEMA means?
a. National Electrical Motors Association
b. National Electrical Manufacturers Association
c. National Economic Manufacturers Association
d. National Electro mechanical Manufacturers
Association
e. None of These
45. MOV means?
a. Metal oxide varistors
b. Metal oxide voltage regulator
c. Metal oxide varesistor
d. Metal oxide voltage
suppressor
e. None of these
46. __ is accomplished by momentarily connecting the motor to full line voltage.
a. Starting
b. Jogging
c. Inching
d. Stopping
47. __ is accomplished by momentarily connecting the motor to reduced voltage.
a. Starting
b. Jogging
c. Inching
d. Stopping
e. None of These
48. ___ are designed to protect the circuit from a direct ground or short-circuit condition.
a. Circuit Breaker
b. Overloads
c. Current Transformer
d. Relay
You sent
49. Overload relays are designed to open the circuit when the current becomes ___ of the motor full load current.
a. 115% to 125%
b. 125% to 135%
c. 115% to 135%
d. 125% to 145%
50. There are some fuses that are intended to provide both short circuit protection and overload protection. These fuses are
called?
a. dual element time delay device.
b. dual element time delay fuses
c. dual purpose time delay fuses
d. dual purpose time delay device