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Conceptual Physics, 12e (Hewitt)
Chapter 5 Newtons Third Law of Motion: Action and Reaction
5.1 Multiple-Choice Questions
1) To say there is no such thing as only one force means
Answer: A
Diff: 1
Topic: Forces and Interactions
2) You cannot exert a force on a wall
Answer: C
Diff: 1
Topic: Forces and Interactions
3) When you rub your hands together, you
Answer: B
Diff: 1
Topic: Forces and Interactions
4) When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the
Answer: B
Diff: 1
Topic: Forces and Interactions
5) As a ball bounces from a floor, its acceleration off the floor between bounces is
Answer: B
Diff: 1
Topic: Forces and Interactions
6) When a boxer hits a punching bag, the strength of his punch depends on how much force the bag can
Answer: B
Diff: 1
Topic: Forces and Interactions
7) Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on an isolated piece of tissue paper with his best punch. You
Answer: A
Diff: 2
Topic: Forces and Interactions
8) One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is
Answer: C
Diff: 2
Topic: Forces and Interactions
9) A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force. What is the tension in the rope?
Answer: B
Diff: 2
Topic: Forces and Interactions
10) The winner in a tug-of-war exerts the greatest force on
Answer: C
Diff: 2
Topic: Forces and Interactions
11) Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by
Answer: C
Diff: 2
Topic: Forces and Interactions
12) When a skateboarder pushes on a wall,
Answer: D
Diff: 2
Topic: Forces and Interactions
13) A pair of action-reaction forces always
Answer: B
Diff: 1
Topic: Newtons Third Law of Motion
14) A fast-moving missile soaring overhead possesses
Answer: A
Diff: 1
Topic: Newtons Third Law of Motion
15) When you walk, you push on the floor to the left and the floor
Answer: B
Diff: 1
Topic: Newtons Third Law of Motion
16) Harry pulls on the end of a spring attached to a wall. The reaction to Harrys pull on the spring is
Answer: B
Diff: 1
Topic: Newtons Third Law of Motion
17) Action and reaction pairs of forces
Answer: A
Diff: 1
Topic: Newtons Third Law of Motion
18) For every action force, there must be a reaction force that
Answer: D
Diff: 1
Topic: Newtons Third Law of Motion
19) An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the
Answer: D
Diff: 1
Topic: Newtons Third Law of Motion
20) When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand is
Answer: C
Diff: 1
Topic: Newtons Third Law of Motion
21) The emphasis of the orange-and-apple sequence in your textbook is
Answer: A
Diff: 1
Topic: Newtons Third Law of Motion
22) The force that accelerates the orange and apple system featured in your textbook is actually supplied by the
Answer: C
Diff: 1
Topic: Newtons Third Law of Motion
23) To produce an acceleration to a system there
Answer: A
Diff: 1
Topic: Newtons Third Law of Motion
24) The lift experienced by a helicopter involves an action-reaction pair of forces between the
Answer: A
Diff: 1
Topic: Newtons Third Law of Motion
25) A player catches a ball. If action is the force of the ball against the players glove, reaction is the
Answer: B
Diff: 1
Topic: Newtons Third Law of Motion
26) A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the
Answer: C
Diff: 1
Topic: Newtons Third Law of Motion
27) When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is
Answer: C
Diff: 1
Topic: Newtons Third Law of Motion
28) While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up
Answer: B
Diff: 2
Topic: Newtons Third Law of Motion
29) The force exerted on the tires of a car that directly accelerate it along a road is exerted by the
Answer: D
Diff: 2
Topic: Newtons Third Law of Motion
30) Neglecting air resistance, once a tossed ball leaves your hand
Answer: B
Diff: 2
Topic: Newtons Third Law of Motion
31) When a ball falls downward, it may have a net force
Answer: D
Diff: 2
Topic: Newtons Third Law of Motion
32) An automobile and a golf cart traveling at the same speed collide head-on. The impact force is
Answer: C
Diff: 2
Topic: Newtons Third Law of Motion
33) A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the
Answer: A
Diff: 2
Topic: Newtons Third Law of Motion
34) Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of
Answer: B
Diff: 3
Topic: Newtons Third Law of Motion
35) A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is
Answer: C
Diff: 1
Topic: Action and Reaction on Different Masses
36) When a tennis racquet hits a ball,
Answer: C
Diff: 1
Topic: Action and Reaction on Different Masses
37) As a ball falls, the action force is the Earths pull on the ball. The reaction force is the
Answer: C
Diff: 1
Topic: Action and Reaction on Different Masses
38) A pair of air pucks on an air table are set in motion when a compressed spring between them is released. If one puck moves with twice the speed of the other, then its mass is
Answer: A
Diff: 1
Topic: Action and Reaction on Different Masses
39) Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of
Answer: C
Diff: 1
Topic: Action and Reaction on Different Masses
40) The attraction between Earth and Sydney is equal to her weight. The reaction to Earths pull on Sydney is
Answer: C
Diff: 1
Topic: Action and Reaction on Different Masses
41) The force with which Earth pulls on the Moon is
Answer: C
Diff: 1
Topic: Action and Reaction on Different Masses
42) Earth pulls on the Moon, and the Moon pulls on Earth, which tells us that
Answer: A
Diff: 2
Topic: Action and Reaction on Different Masses
43) A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the
Answer: C
Diff: 1
Topic: Action and Reaction on Different Masses
44) A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. Acceleration will be greater for the
Answer: B
Diff: 2
Topic: Action and Reaction on Different Masses
45) The force that propels a cannonball when fired from a cannon is
Answer: B
Diff: 1
Topic: Action and Reaction on Different Masses
46) When a cannonball is fired from a cannon, which undergoes the greater acceleration?
Answer: A
Diff: 2
Topic: Action and Reaction on Different Masses
47) When a rocket forces exhaust gases downward, the exhaust gases
Answer: C
Diff: 2
Topic: Action and Reaction on Different Masses
48) An astronaut of mass 70 kg weighs 700 N on Earths surface. His weight on the surface of Mars, where the acceleration due to gravity is 3.7 m/s2, would be about
Answer: C
Diff: 2
Topic: Action and Reaction on Different Masses
49) You stand on your skateboard and exert a 50-N push on the wall next to you. If your mass is 60 kg youll momentarily accelerate from the wall at about
Answer: B
Diff: 3
Topic: Action and Reaction on Different Masses
50) If vertically falling rain makes slanted 45 streaks on the side windows of a moving car, the speed of the car
Answer: B
Diff: 2
Topic: Vectors and the Third Law
51) A vertical vector of 3 units combined with a horizontal vector of 4 units has a resultant of
Answer: B
Diff: 2
Topic: Vectors and the Third Law
52) Two equal-size vectors at right angles to each other have a resultant that is
Answer: B
Diff: 2
Topic: Vectors and the Third Law
53) Nellie Newton pulls her sled by a rope that is 45 to the horizontal. The horizontal and vertical components of force are
Answer: C
Diff: 2
Topic: Vectors and the Third Law
54) A 10-unit vector at 60 from the vertical has a vertical component with a magnitude
Answer: A
Diff: 2
Topic: Vectors and the Third Law
55) Nellies weight and normal force usually have the same magnitude when she stands on a
Answer: A
Diff: 2
Topic: Vectors and the Third Law
56) When Nellie hangs suspended from a pair of ropes that are not vertical, the tension in each rope is
Answer: C
Diff: 2
Topic: Vectors and the Third Law
57) Art museums use weaker wires than those used in homes because paintings in museums
Answer: A
Diff: 2
Topic: Vectors and the Third Law
58) The force due to gravity that acts on a block of ice that slides down an icy ramp
Answer: A
Diff: 2
Topic: Vectors and the Third Law
59) The normal force that acts on a block of ice that slides on a ramp
Answer: B
Diff: 2
Topic: Vectors and the Third Law
60) A shoe on an inclined surface barely remains at rest when friction equals the
Answer: C
Diff: 2
Topic: Vectors and the Third Law
61) As the sloped surface supporting a shoe becomes steeper
Answer: D
Diff: 2
Topic: Vectors and the Third Law
62) When Monkey Mo is suspended at rest by holding a rope with one hand and the side of his cage with the other, all the force vectors that act on him
Answer: C
Diff: 2
Topic: Vectors and the Third Law
63) Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is
Answer: D
Diff: 2
Topic: Vectors and the Third Law
64) Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity
Answer: B
Diff: 2
Topic: Vectors and the Third Law
65) Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical component of the initial velocity
Answer: A
Diff: 2
Topic: Vectors and the Third Law
66) An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north?
Answer: B
Diff: 2
Topic: Vectors and the Third Law
67) The airspeed of an airplane is 200 km/h. When it is caught in a 200-km/h crosswind, its speed across the ground below is
Answer: C
Diff: 2
Topic: Vectors and the Third Law
68) A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is less than 90, their resultant is
Answer: C
Diff: 3
Topic: Vectors and the Third Law
69) A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is greater than 90, their resultant is
Answer: A
Diff: 3
Topic: Vectors and the Third Law
70) A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat crosses in
Answer: B
Diff: 3
Topic: Vectors and the Third Law
71) A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water leaves the west bank. To land at a point due east of its starting point, the boat must be pointed
Answer: D
Diff: 3
Topic: Vectors and the Third Law
Conceptual Physics, 12e (Hewitt)
Chapter 15 Temperature, Heat, and Expansion
15.1 Multiple-Choice Questions
1) The air in your room is composed of molecules that have
Answer: B
Diff: 1
Topic: Temperature
2) The kind of molecular motion that mostly relates to the temperature of a substance is
Answer: A
Diff: 1
Topic: Temperature
3) Translational motion is characterized by
Answer: C
Diff: 1
Topic: Temperature
4) Temperature is most closely related to molecular
Answer: A
Diff: 1
Topic: Temperature
5) Which temperature scales have equal sized degrees?
Answer: C
Diff: 1
Topic: Temperature
6) Which temperature scale has the smallest sized degrees?
Answer: A
Diff: 1
Topic: Temperature
7) A temperature difference of 10 Celsius degrees is also equal to a temperature difference of 10 on the
Answer: B
Diff: 2
Topic: Temperature
8) Room temperature on the Kelvin scale is about
Answer: C
Diff: 2
Topic: Temperature
9) The fact that a thermometer takes its own temperature illustrates
Answer: A
Diff: 1
Topic: Temperature
10) In which is the temperature greater?
Answer: C
Diff: 1
Topic: Temperature
11) Internal energy is greater in a
Answer: B
Diff: 1
Topic: Heat
12) When you touch a cold piece of ice with your finger, energy flows
Answer: A
Diff: 1
Topic: Heat
13) When you touch a hot potato with your finger, energy flows
Answer: B
Diff: 1
Topic: Heat
14) Compared to a giant iceberg, a hot cup of coffee has
Answer: B
Diff: 1
Topic: Heat
15) Heat energy travels from an object with a high
Answer: B
Diff: 1
Topic: Heat
16) Heat energy is measured in units of
Answer: C
Diff: 1
Topic: Heat
17) The amount of heat needed to raise the temperature of 1 gram of water by 1C is
Answer: C
Diff: 1
Topic: Heat
18) When 10 grams of hot water cool by 1C, the amount of heat given off is
Answer: C
Diff: 2
Topic: Heat
19) Which unit represents the most energy?
Answer: B
Diff: 2
Topic: Heat
20) White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively
Answer: D
Diff: 2
Topic: Heat
21) The white-hot sparks from a 4th-of-July-type sparkler that strike your skin transfer
Answer: A
Diff: 2
Topic: Heat
22) Pour a liter of water at 40C into a liter of water at 20C and the final temperature of the two becomes
Answer: B
Diff: 2
Topic: Heat
23) Pour two liters of water at 40C into one liter of water at 20C and the final temperature of the two becomes
Answer: C
Diff: 2
Topic: Heat
24) Place a 1-kilogram block of iron at 40C into 1 kilogram of water at 20C and the final temperature of the two becomes
Answer: A
Diff: 3
Topic: Heat
25) A substance with a high thermal inertia has a high
Answer: C
Diff: 1
Topic: Specific Heat Capacity
26) The quantity of heat that a substance can transfer relates to its
Answer: D
Diff: 1
Topic: Specific Heat Capacity
27) Materials composed of molecules that absorb large amounts of energy in the form of internal vibrations and rotations have
Answer: B
Diff: 2
Topic: Specific Heat Capacity
28) The specific heat capacity is highest for substances that absorb or release large quantities of heat for correspondingly
Answer: A
Diff: 1
Topic: Specific Heat Capacity
29) Aluminum has a higher specific heat capacity than iron. This means that for equal masses of aluminum and iron, the metal that heats more quickly when the same amount of heat is applied is
Answer: B
Diff: 2
Topic: Specific Heat Capacity
30) Tomatoes have a higher specific heat capacity than dough. This means that when you bite into a hot pizza
Answer: B
Diff: 2
Topic: Specific Heat Capacity
31) Which of the following normally warms up fastest when heat is applied?
Answer: B
Diff: 1
Topic: Specific Heat Capacity
32) A substance that cools down faster than others has a
Answer: A
Diff: 1
Topic: Specific Heat Capacity
33) A substance that heats up relatively slowly has a
Answer: A
Diff: 1
Topic: Specific Heat Capacity
34) A substance that heats up relatively quickly has a
Answer: B
Diff: 1
Topic: Specific Heat Capacity
35) Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be
Answer: A
Diff: 2
Topic: Specific Heat Capacity
36) The fact that desert sand is very hot in the day and very cold at night is evidence that the specific heat capacity of sand is relatively
Answer: A
Diff: 2
Topic: Specific Heat Capacity
37) One of waters interesting thermal properties is that when heated it takes a relatively
Answer: A
Diff: 1
Topic: High Specific Heat Capacity of Water
38) The moderate temperatures of islands throughout the world has much to do with waters
Answer: C
Diff: 1
Topic: High Specific Heat Capacity of Water
39) If the specific heat capacity of water were lower than it is, a nice hot bath would be a
Answer: A
Diff: 3
Topic: High Specific Heat Capacity of Water
40) If the specific heat capacity of water were lower than it is, a watermelon in a picnic cooler would cool in a
Answer: A
Diff: 3
Topic: High Specific Heat Capacity of Water
41) If the specific heat of water were lower than it is, ponds in the cold of winter would be
Answer: A
Diff: 3
Topic: High Specific Heat Capacity of Water
42) In terms of thermal expansion it is important that
Answer: B
Diff: 1
Topic: Thermal Expansion
43) A closed, sealed can of air placed on a hot stove. The contained air undergoes an increase in
Answer: B
Diff: 1
Topic: Thermal Expansion
44) When most substances are heated, molecules inside move faster and take up more space, resulting in thermal
Answer: B
Diff: 1
Topic: Thermal Expansion
45) When we enlarge a photograph of an iron ring, the image of the hole becomes
Answer: B
Diff: 1
Topic: Thermal Expansion
46) When an iron ring is heated, the hole becomes
Answer: B
Diff: 2
Topic: Thermal Expansion
47) As a piece of metal with a hole in it cools, the diameter of the hole
Answer: B
Diff: 2
Topic: Thermal Expansion
48) Consider a metal ring with a gap cut in it. When the ring is heated, the gap
Answer: B
Diff: 2
Topic: Thermal Expansion
49) When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is
Answer: C
Diff: 2
Topic: Thermal Expansion
50) It is important that the two metals that compose a bimetallic strip have
Answer: B
Diff: 2
Topic: Thermal Expansion
51) The fact that gasoline overflows a full tank on a hot day is evidence that
Answer: A
Diff: 1
Topic: Thermal Expansion
52) In most cases, which expands more for comparable changes in temperature?
Answer: C
Diff: 1
Topic: Thermal Expansion
53) Which of the following expands more when the temperature is increased? Equal volumes of
Answer: D
Diff: 2
Topic: Thermal Expansion
54) Which of the following contracts most when the temperature is decreased? Equal volumes of
Answer: D
Diff: 2
Topic: Thermal Expansion
55) Which of these expands when the temperature is lowered?
Answer: C
Diff: 2
Topic: Thermal Expansion
56) If glass expanded more than mercury, then the column of mercury in a mercury thermometer would fall when the temperature
Answer: A
Diff: 2
Topic: Thermal Expansion
57) If you measure the width of an outdoor barn with a steel tape on a very cold day, your measured width will be
Answer: B
Diff: 3
Topic: Thermal Expansion
58) If you measure the distance between two telephone poles with a steel tape on a very hot day, your measured distance will be
Answer: A
Diff: 3
Topic: Thermal Expansion
59) A body of water will be deeper when its
Answer: A
Diff: 1
Topic: Thermal Expansion of Water
60) Which of these is correct?
Answer: C
Diff: 2
Topic: Thermal Expansion of Water
61) When ice water at 0C is heated
Answer: C
Diff: 2
Topic: Thermal Expansion of Water
62) Open spaces in ice crystals contribute to
Answer: A
Diff: 1
Topic: Thermal Expansion of Water
63) Due to the presence of ice crystals in nearly frozen liquid water, the density of water is
Answer: A
Diff: 1
Topic: Thermal Expansion of Water
64) Microscopic slush in ice water tends to make water density
Answer: A
Diff: 1
Topic: Thermal Expansion of Water
65) Ice has a lower density than water because ice
Answer: C
Diff: 1
Topic: Thermal Expansion of Water
66) Ice tends to form first at the
Answer: A
Diff: 1
Topic: Thermal Expansion of Water
67) Ice crystals in nearly frozen liquid water make up a
Answer: C
Diff: 2
Topic: Thermal Expansion of Water
68) When ice crystals collapse at the surface of ice, the result is a
Answer: C
Diff: 2
Topic: Thermal Expansion of Water
69) If the temperature of a sample of water at 0C is slightly increased, its volume
Answer: B
Diff: 2
Topic: Thermal Expansion of Water
70) If the temperature of a sample of water at 4C is slightly increased, its volume
Answer: A
Diff: 2
Topic: Thermal Expansion of Water
71) If the temperature of a sample of water at 4C is slightly lowered, its volume
Answer: A
Diff: 2
Topic: Thermal Expansion of Water
72) If you wish to expand the volume of a sample of water at 4C
Answer: C
Diff: 2
Topic: Thermal Expansion of Water
73) When water at 4C is heated it expands. If it is instead cooled it will
Answer: B
Diff: 2
Topic: Thermal Expansion of Water
74) Consider some water at 6C. For a slight increase its temperature the water will
Answer: A
Diff: 2
Topic: Thermal Expansion of Water
75) Before ice can form on a lake, all the water in the lake must be cooled to
Answer: B
Diff: 2
Topic: Thermal Expansion of Water
76) When the temperature of a solid block of ice is lowered, its volume
Answer: B
Diff: 2
Topic: Thermal Expansion of Water
77) During a very cold winter, water pipes sometimes burst due to
Answer: B
Diff: 2
Topic: Thermal Expansion of Water
78) The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in California, at this moment is
Answer: B
Diff: 2
Topic: Thermal Expansion of Water
79) When ice floats in water, a small part of it extends above the surface. Interestingly, the volume of ice that extends above the surface is equal to the volume of the
Answer: B
Diff: 3
Topic: Thermal Expansion of Water
Conceptual Physics, 12e (Hewitt)
Chapter 25 Electromagnetic Induction
25.1 Multiple-Choice Questions
1) Electromagnetism unites
Answer: A
Diff: 1
Topic: Electromagnetic Induction
2) The discovery of electromagnetic induction is credited to
Answer: C
Diff: 1
Topic: Electromagnetic Induction
3) Electromagnetic induction is employed in
Answer: E
Diff: 1
Topic: Electromagnetic Induction
4) When a change occurs in the magnetic field in a closed loop of wire
Answer: D
Diff: 1
Topic: Electromagnetic Induction
5) If you thrust a magnet into a closed loop of wire, the loop will
Answer: B
Diff: 1
Topic: Electromagnetic Induction
6) Thrust a magnet into the opening of a rubber band and it
Answer: D
Diff: 1
Topic: Electromagnetic Induction
7) When voltage is induced in a coil of wire, current is
Answer: A
Diff: 1
Topic: Electromagnetic Induction
8) When a bar magnet is thrust into a coil of copper wire, the coil tends to
Answer: B
Diff: 1
Topic: Electromagnetic Induction
9) Electromagnetic induction occurs in a coil when there is a change in
Answer: B
Diff: 1
Topic: Electromagnetic Induction
10) Voltage can be induced in a wire by
Answer: D
Diff: 1
Topic: Electromagnetic Induction
11) Magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
Answer: D
Diff: 1
Topic: Electromagnetic Induction
12) Faradays law underlies the operation of
Answer: D
Diff: 1
Topic: Faradays Law
13) When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is
Answer: C
Diff: 1
Topic: Faradays Law
14) The frequency of induced voltage in a wire coil depends on
Answer: B
Diff: 2
Topic: Faradays Law
15) The amount of current produced by electromagnetic induction depends on the
Answer: C
Diff: 2
Topic: Faradays Law
16) The metal detectors that people walk through at airports operate via
Answer: B
Diff: 2
Topic: Faradays Law
17) Disregarding the effects of friction, a cyclist will coast farther when a lamp powered by a wheel generator is
Answer: C
Diff: 3
Topic: Faradays Law
18) Fred swings a sheet of copper in pendulum fashion between the poles of a strong magnet. The sheet slows in entering the magnetic field because it
Answer: A
Diff: 3
Topic: Faradays Law
19) If you drop a bar magnet in a vertical copper pipe it will fall slowly because
Answer: B
Diff: 3
Topic: Faradays Law
20) A device that transforms electrical energy to mechanical energy is a
Answer: B
Diff: 1
Topic: Generators and Alternating Current
21) A device that transforms mechanical energy into electrical energy is a
Answer: A
Diff: 1
Topic: Generators and Alternating Current
22) The current produced by a common generator is
Answer: B
Diff: 2
Topic: Generators and Alternating Current
23) A turbogenerator produces
Answer: C
Diff: 2
Topic: Generators and Alternating Current
24) An electric motor is very similar to
Answer: A
Diff: 1
Topic: Generators and Alternating Current
25) If the voltage produced by a generator alternates, it does so because
Answer: B
Diff: 2
Topic: Generators and Alternating Current
26) A generator armature is more difficult to rotate when supplying electric current due to
Answer: A
Diff: 2
Topic: Generators and Alternating Current
27) The rate at which energy is transferred is
Answer: A
Diff: 1
Topic: Power Production
28) A principle difference between an MHD generator and a conventional generator is that the MHD generator
Answer: C
Diff: 1
Topic: Power Production
29) The major advantage of MHD generators over conventional generators is that MHD generators
Answer: E
Diff: 2
Topic: Power Production
30) A transformer actually transforms
Answer: A
Diff: 1
Topic: Power Production
31) A transformer transforms voltage while
Answer: C
Diff: 2
Topic: Transformers
32) The output power of an ideal transformer is
Answer: B
Diff: 1
Topic: Transformers
33) Transformers use ac to satisfy the required
Answer: C
Diff: 1
Topic: Transformers
34) Compared to the primary voltage, the secondary voltage can be
Answer: D
Diff: 1
Topic: Transformers
35) The principle difference between a step-up and step-down transformer is
Answer: C
Diff: 1
Topic: Transformers
36) An efficient step-up transformer boosts
Answer: C
Diff: 2
Topic: Transformers
37) An efficient step-down transformer decreases
Answer: D
Diff: 2
Topic: Transformers
38) A transformer produces
Answer: D
Diff: 2
Topic: Transformers
39) The primary of a transformer is the coil connected to
Answer: C
Diff: 2
Topic: Transformers
40) The secondary of a transformer is the coil connected to
Answer: A
Diff: 2
Topic: Transformers
41) The primary of a transformer
Answer: B
Diff: 2
Topic: Transformers
42) An iron core in a transformer
Answer: A
Diff: 2
Topic: Transformers
43) A step-up transformer steps up voltage by ten times. If voltage input is 120 volts, voltage output is
Answer: C
Diff: 2
Topic: Transformers
44) A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is
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