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43. What type of contact is an emergency stop button? (a) Momentary, NC (b) Latching, NC (c) Momentary, NO (d) Latching, NO 44. Complete this statement: A starter is required when a motor is to be brought to a stop by means of plugging. 45. Which of the following braking systems can hold a motor stationary once it has stopped? (a) Dynamic braking (b) plugging (c) Friction brake (d) both a and b 46. For an electromechanical relay, the amount of voltage and current required to energize the relay coil is (a) more than what: required to de-energize the coil (b) less than what is required to de-energize the coil (c) the same as the voltage and current ratings of the contacts (d) the same when connected to an AC or a DC source 47. It is possible for a relay coil to be rated for 24 VDC and its contacts to be rated for 240 VAC (a) True (b) False

43. What type of contact is an emergency stop button? (a) Momentary, NC (b) Latching, NC (c) Momentary, NO (d) Latching, NO 44. Complete this statement: A starter is required when a motor is to be brought to a stop by means of plugging. 45. Which of the following braking systems can hold a motor stationary once it has stopped? (a) Dynamic braking (b) plugging (c) Friction brake (d) both a and b 46. For an electromechanical relay, the amount of voltage and current required to energize the relay coil is (a) more than what: required to de-energize the coil (b) less than what is required to de-energize the coil (c) the same as the voltage and current ratings of the contacts (d) the same when connected to an AC or a DC source 47. It is possible for a relay coil to be rated for 24 VDC and its contacts to be rated for 240 VAC (a) True (b) False

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Can someone please help and answer questions 43 and 47. Thank you!
42. The speed of an induction motor depends on the (a) number of poles built into the motor (b) type of braking system employed (c) frequency of the power supplied to it (d) both a and c 43. What type of contact is an emergency stop button? (a) Momentary, NC (b) Latching, NC (c) Momentary, NO (d) Latching, NO 44. Complete this statement: A starter is required when a motor is to be brought to a stop by means of plugging. 45. Which of the following braking systems can hold a motor stationary once it has stopped? (a) Dynamic braking (b) plugging (c) Friction brake (d) both a and b 46. For an electromechanical relay, the amount of voltage and current required to energize the relay coil is (a) more than what is required to de-energize the coil (b) less than what is required to de-energize the coil (c) the same as the voltage and current ratings of the contacts (d) the same when connected to an AC or a DC source 47. It is possible for a relay coil to be rated for 24 VDC and its contacts to be rated for 240 VAC (a) True (b) False 48. Which of the following is not a common application for a relay? (a) To control several switching operations by a single separate current (b) To control a 120-V circuit with a 24-V control circuit (c) To change alternating current to direct current (d) To switch a small motor ON and OFF with a low-current control circuit 49. With an inverse time-delay circuit breaker the higher the overcurrent, the shorter the time required for the breaker to trip (a) True (b) False 50. Complete this statement: A wound rotor induction motor has a with windings brought out via slip rings and brushes. like the squirrel cage motor, but a
Transcribed Image Text:42. The speed of an induction motor depends on the (a) number of poles built into the motor (b) type of braking system employed (c) frequency of the power supplied to it (d) both a and c 43. What type of contact is an emergency stop button? (a) Momentary, NC (b) Latching, NC (c) Momentary, NO (d) Latching, NO 44. Complete this statement: A starter is required when a motor is to be brought to a stop by means of plugging. 45. Which of the following braking systems can hold a motor stationary once it has stopped? (a) Dynamic braking (b) plugging (c) Friction brake (d) both a and b 46. For an electromechanical relay, the amount of voltage and current required to energize the relay coil is (a) more than what is required to de-energize the coil (b) less than what is required to de-energize the coil (c) the same as the voltage and current ratings of the contacts (d) the same when connected to an AC or a DC source 47. It is possible for a relay coil to be rated for 24 VDC and its contacts to be rated for 240 VAC (a) True (b) False 48. Which of the following is not a common application for a relay? (a) To control several switching operations by a single separate current (b) To control a 120-V circuit with a 24-V control circuit (c) To change alternating current to direct current (d) To switch a small motor ON and OFF with a low-current control circuit 49. With an inverse time-delay circuit breaker the higher the overcurrent, the shorter the time required for the breaker to trip (a) True (b) False 50. Complete this statement: A wound rotor induction motor has a with windings brought out via slip rings and brushes. like the squirrel cage motor, but a
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