DIYguru® Entrance Test for admission into various Govt. approved Courses, Specializations and Nanodegree Program
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Answered
Review
Question 1 of 45
1. Question
1 points
How many sets of transistors do you need in an AC controller?
Correct
The controller creates three pseudo-sine waves. It does this by taking the DC voltage from the batteries and pulsing it on and off. In an AC controller, there is the additional need to reverse the polarity of the voltage 60 times a second. Therefore, you actually need six sets of transistors in an AC controller, while you need only one set in a DC controller. In the AC controller, for each phase you need one set of transistors to pulse the voltage and another set to reverse the polarity. You replicate that three times for the three phases — six total sets of transistors.
Incorrect
The controller creates three pseudo-sine waves. It does this by taking the DC voltage from the batteries and pulsing it on and off. In an AC controller, there is the additional need to reverse the polarity of the voltage 60 times a second. Therefore, you actually need six sets of transistors in an AC controller, while you need only one set in a DC controller. In the AC controller, for each phase you need one set of transistors to pulse the voltage and another set to reverse the polarity. You replicate that three times for the three phases — six total sets of transistors.
Question 2 of 45
2. Question
1 points
When a number of forces acting simultaneously on a body bring about a change in its state of rest or of uniform motion in a straight line, then these forces acting on the body are said to be
Correct
Opposite forces – Helicopters creates lift by pushing air down, thereby experiencing an upward reaction force. Birds and airplanes also fly by exerting force on air in a direction opposite to that of whatever force they need. The wings of a bird force air downward and backward in order to get lift and forward motion.
Incorrect
Opposite forces – Helicopters creates lift by pushing air down, thereby experiencing an upward reaction force. Birds and airplanes also fly by exerting force on air in a direction opposite to that of whatever force they need. The wings of a bird force air downward and backward in order to get lift and forward motion.
Question 3 of 45
3. Question
1 points
According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
Correct
The law of conservation of energy, first formulated in the nineteenth century, is a law of physics. It states that the total amount of energy in an isolated system remains constant over time. The total energy is said to be conserved over time. For an isolated system, this law means that energy can change its location within the system, and that it can change form within the system, for instance chemical energy can become kinetic energy, but that energy can be neither created nor destroyed.
The law of conservation of energy, first formulated in the nineteenth century, is a law of physics. It states that the total amount of energy in an isolated system remains constant over time. The total energy is said to be conserved over time. For an isolated system, this law means that energy can change its location within the system, and that it can change form within the system, for instance chemical energy can become kinetic energy, but that energy can be neither created nor destroyed.
When a car at high speed makes a sharp turn, the driver in a car tends to get thrown to the side opposite to the turn. This is due to the
Correct
Inertia of motion – This is due to the inertia of the bodies to remain in the straight line. Due to this, the centrifugal force acts which pushes the passengers outwards
Incorrect
Inertia of motion – This is due to the inertia of the bodies to remain in the straight line. Due to this, the centrifugal force acts which pushes the passengers outwards
Question 5 of 45
5. Question
1 points
What will happen if DC shunt motor is connected across AC supply?
Correct
In case of parallel field connection, it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other. DC motor will be heated up and it may burn.
Incorrect
In case of parallel field connection, it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other. DC motor will be heated up and it may burn.
Question 6 of 45
6. Question
1 points
What will happen if the back emf of a DC motor vanishes suddenly?
Correct
If back emf vanishes suddenly, motor circuit will try to retain back emf by drawing more current from supply. If supplying unit didn’t trip down by this time, excess current in armature may heat up the armature.
Incorrect
If back emf vanishes suddenly, motor circuit will try to retain back emf by drawing more current from supply. If supplying unit didn’t trip down by this time, excess current in armature may heat up the armature.
Question 7 of 45
7. Question
1 points
What will happen, with the increase in speed of a DC motor?
Correct
In case of DC motor, the speed is proportional to the back emf (Ea ∝ N). So, with the increase in speed, the back emf also increases. Therefore, armature current is also decreased, in case of series motor, armature current is equal to the line or load current.
Incorrect
In case of DC motor, the speed is proportional to the back emf (Ea ∝ N). So, with the increase in speed, the back emf also increases. Therefore, armature current is also decreased, in case of series motor, armature current is equal to the line or load current.
Question 8 of 45
8. Question
1 points
Which part will surely tell that given motor is DC motor and not an AC type?
Correct
All other parts except brushes and commutator are same in AC machine when outer looks are only taken in consideration. Commutator is used only in DC machine for providing mechanical rectification and not in AC machine.
Incorrect
All other parts except brushes and commutator are same in AC machine when outer looks are only taken in consideration. Commutator is used only in DC machine for providing mechanical rectification and not in AC machine.
Question 9 of 45
9. Question
1 points
Direction of rotation of motor is determined by ____________
Correct
Flemings laws can be summarized as whenever, a current carrying conductor comes under a magnetic field, there will be a force acting on the conductor and on the other hand, if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor.
Incorrect
Flemings laws can be summarized as whenever, a current carrying conductor comes under a magnetic field, there will be a force acting on the conductor and on the other hand, if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor.
Question 10 of 45
10. Question
1 points
Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is
Correct
In parallel combination, voltage remains same across two points.
Incorrect
In parallel combination, voltage remains same across two points.
Question 11 of 45
11. Question
1 points
Coulomb is the SI unit of:
Correct
Charge
Incorrect
Charge
Question 12 of 45
12. Question
1 points
When electric current is passed, electrons move from:
Correct
Electric current flows from a higher potential to lower potential. When a circuit is connected using conductors, an electric field is established in the direction towards lower a potential point from a higher potential point. The electric field exerts an electric field on the electrons in the conductor in the opposite direction. So electrons drift in the opposite direction from – to + terminal. We call direction of current to be opposite to the direction of motion of electrons.
Incorrect
Electric current flows from a higher potential to lower potential. When a circuit is connected using conductors, an electric field is established in the direction towards lower a potential point from a higher potential point. The electric field exerts an electric field on the electrons in the conductor in the opposite direction. So electrons drift in the opposite direction from – to + terminal. We call direction of current to be opposite to the direction of motion of electrons.
Question 13 of 45
13. Question
1 points
The electrical resistance of insulators is
Correct
An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it very hard to conduct an electric current under the influence of an electric field. Therefore, electrical resistance of insulators is infinitely high.
Incorrect
An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it very hard to conduct an electric current under the influence of an electric field. Therefore, electrical resistance of insulators is infinitely high.
Question 14 of 45
14. Question
1 points
Electric power is inversely proportional to
Correct
Power is the rate of flow of electrical energy through a conductor with potential diff n more energy is used for more resistance.
Incorrect
Power is the rate of flow of electrical energy through a conductor with potential diff n more energy is used for more resistance.
Question 15 of 45
15. Question
1 points
What is the commercial unit of electrical energy?
Correct
Commercial unit of electrical energy is defined as the energy consumed by any electronic appliance in an hour. The energy in watt-hour is the amplification of power in watts (unit) and time in hours.
Incorrect
Commercial unit of electrical energy is defined as the energy consumed by any electronic appliance in an hour. The energy in watt-hour is the amplification of power in watts (unit) and time in hours.
Question 16 of 45
16. Question
1 points
An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
Correct
Here, V = 220 V, I = 0.50 A ∴ Power (P) = VI = 220 x 0.50 = 110 W
Incorrect
Here, V = 220 V, I = 0.50 A ∴ Power (P) = VI = 220 x 0.50 = 110 W
Question 17 of 45
17. Question
1 points
Materials which easily allow the passage of electric current are known as ______
Correct
Conductors are materials (mostly metals), which freely allow the passage of electrons through it. If electrons can flow freely through a material, it implies that even current can flow freely through that material since current is the rate of flow of electrons.
Incorrect
Conductors are materials (mostly metals), which freely allow the passage of electrons through it. If electrons can flow freely through a material, it implies that even current can flow freely through that material since current is the rate of flow of electrons.
Question 18 of 45
18. Question
1 points
In a nickel-cadmium-alkali cell the electrolyte is
Correct
Potassium Hydroxide has very high ionic conductivity, due the high mobility of OH- anion in water solutions, itself due to its very low size. Besides, the concentration is increased for increasing the number of ions and therefore the ionic conductivity of the electrolyte.
Incorrect
Potassium Hydroxide has very high ionic conductivity, due the high mobility of OH- anion in water solutions, itself due to its very low size. Besides, the concentration is increased for increasing the number of ions and therefore the ionic conductivity of the electrolyte.
Question 19 of 45
19. Question
1 points
Materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators, are known as
Correct
Semi-conductors are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
Incorrect
Semi-conductors are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
Question 20 of 45
20. Question
1 points
Which of the following can have positive or negative charge?
Correct
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
Incorrect
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
Question 21 of 45
21. Question
1 points
What affect do petrol and diesel engines have on the environment? Click on the correct statement
Correct
Incorrect
Question 22 of 45
22. Question
1 points
By what name are traditionally powered vehicles, equipped with a start-stop system, sometimes also known?
Correct
Incorrect
Question 23 of 45
23. Question
1 points
Which vehicle uses a high-voltage battery?
Correct
Incorrect
Question 24 of 45
24. Question
1 points
Which of the following vehicles produces zero emissions?
Correct
Incorrect
Question 25 of 45
25. Question
1 points
Which vehicle has the smallest number of principle components?
Correct
Incorrect
Question 26 of 45
26. Question
1 points
What is meant by the term regeneration?
Correct
Incorrect
Question 27 of 45
27. Question
1 points
What makes the risk of an electric shock from a high-voltage battery possibly more dangerous than that from an AC circuit?
Correct
Incorrect
Question 28 of 45
28. Question
1 points
What voltage is likely to be available from the battery of an electric vehicle or hybrid?
Correct
Incorrect
Question 29 of 45
29. Question
1 points
In an electric car, the accelerator pedal hooks to a pair of these to relay the information to the controller about how much power it should deliver.
Correct
The accelerator pedal hooks to a pair of potentiometers (variable resistors), and these potentiometers provide the signal that tells the controller how much power it is supposed to deliver. The controller can deliver zero power (when the car is stopped), full power (when the driver floors the accelerator pedal), or any power level in between.
Incorrect
The accelerator pedal hooks to a pair of potentiometers (variable resistors), and these potentiometers provide the signal that tells the controller how much power it is supposed to deliver. The controller can deliver zero power (when the car is stopped), full power (when the driver floors the accelerator pedal), or any power level in between.
Question 30 of 45
30. Question
1 points
How does running a car air conditioner on “max” affect fuel economy?
Correct
Running any electrical accessory reduces fuel economy, having the air conditioner on the maximum setting can cut efficiency 5 to 25 percent, according to the U.S. Department of Energy.
Incorrect
Running any electrical accessory reduces fuel economy, having the air conditioner on the maximum setting can cut efficiency 5 to 25 percent, according to the U.S. Department of Energy.
Question 31 of 45
31. Question
1 points
When force and displacement are in the same direction, the kinetic energy of the body ___________?
Correct
Explanation: When force and displacement are in the same direction, the kinetic energy of the body increases. The increase in kinetic energy is equal to the work done on the body.
Incorrect
Explanation: When force and displacement are in the same direction, the kinetic energy of the body increases. The increase in kinetic energy is equal to the work done on the body.
Question 32 of 45
32. Question
1 points
When we steer a bicycle round a bend with both our hands on the handlebars, we apply?
Correct
Explanation: A pair of equal and opposite forces acting on a body along two different lines of action constitutes a couple. A Couple has a turning effect, but no resultant force acts on a body. When we steer a bicycle round a bend with both our hands on the handlebars, we add a couple.
Incorrect
Explanation: A pair of equal and opposite forces acting on a body along two different lines of action constitutes a couple. A Couple has a turning effect, but no resultant force acts on a body. When we steer a bicycle round a bend with both our hands on the handlebars, we add a couple.
Question 33 of 45
33. Question
1 points
Which of the following is also known as the law of inertia?
Correct
Explanation: According to Newton’s first law of motion, everybody continues in its state of rest or uniform motion unless an external force acts upon it. This inability of a body to change its state of rest or of uniform motion along a straight path is called inertia of a body. Hence the first law of motion is also called a law of inertia.
Incorrect
Explanation: According to Newton’s first law of motion, everybody continues in its state of rest or uniform motion unless an external force acts upon it. This inability of a body to change its state of rest or of uniform motion along a straight path is called inertia of a body. Hence the first law of motion is also called a law of inertia.
Question 34 of 45
34. Question
1 points
When a spring is compressed or stretched, the potential energy of the spring?
Correct
Explanation: The potential energy of a spring increases when it is compressed or stretched because work is done on it when it is compressed or stretched.
Incorrect
Explanation: The potential energy of a spring increases when it is compressed or stretched because work is done on it when it is compressed or stretched.
Question 35 of 45
35. Question
1 points
What happens to the potential energy when one proton and one electron are brought close together?
Correct
Explanation: The potential energy gets decreased when a proton and an electron are brought close because the work is done by the force of attraction between them.
Incorrect
Explanation: The potential energy gets decreased when a proton and an electron are brought close because the work is done by the force of attraction between them.
Question 36 of 45
36. Question
1 points
To charge a battery
Correct
Incorrect
Question 37 of 45
37. Question
1 points
SOH & SOC of Battery stands for
Correct
Incorrect
Question 38 of 45
38. Question
1 points
A good Life cycle of a Battery depends on
Correct
Incorrect
Question 39 of 45
39. Question
1 points
What length of wire in a battery units alters?
Correct
Incorrect
Question 40 of 45
40. Question
1 points
Torque in a EV Motor is Directly proportional to
Correct
Incorrect
Question 41 of 45
41. Question
1 points
Nikolas Tesla is famous for
Correct
Incorrect
Question 42 of 45
42. Question
1 points
During charging state of a Battery
Correct
Incorrect
Question 43 of 45
43. Question
1 points
Magnetic Flux in any motor is directly proportional to
Correct
Incorrect
Question 44 of 45
44. Question
1 points
How many types of Battery Maintenance Procedure are there?
Correct
Incorrect
Question 45 of 45
45. Question
1 points
Frenchmen Gustave Truave developed first Electric Vehicle in the year