MCQOPTIONS
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MCQOPTIONS
This section includes 46 Mcqs, each offering curated multiple-choice questions to sharpen your ABB knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The angle of inclination of a vehicle when moving along a circular path __________ upon its mass. |
| A. | depends |
| B. | does not depend |
| Answer» C. | |
| 2. |
The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection. |
| A. | less than |
| B. | more than |
| C. | equal to |
| Answer» C. equal to | |
| 3. |
The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is |
| A. | sin θ |
| B. | cos θ |
| C. | tan θ |
| D. | cosec θ |
| Answer» B. cos θ | |
| 4. |
The coefficient of restitution for elastic bodies is one. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 5. |
The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 6. |
Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity |
| A. | v |
| B. | v/2 |
| C. | v/2 |
| D. | v/8 |
| Answer» C. v/2 | |
| 7. |
The friction experienced by a body, when in motion, is known as |
| A. | rolling friction |
| B. | dynamic friction |
| C. | limiting friction |
| D. | static friction |
| Answer» C. limiting friction | |
| 8. |
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. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
The polarity of induced voltage while a field is collapsing is |
| A. | independent of the force creating the field |
| B. | independent of the force creating the field |
| C. | identical to the force creating the field |
| D. | present only if the force is stationary |
| Answer» C. identical to the force creating the field | |
| 10. |
Which electromagnetic device contains an armature? |
| A. | A speaker |
| B. | A dc generator |
| C. | A relay |
| D. | A solenoid |
| Answer» C. A relay | |
| 11. |
Which electromagnetic device has a movable iron core called a plunger? |
| A. | A speaker |
| B. | A dc generator |
| C. | A relay |
| D. | A solenoid |
| Answer» E. | |
| 12. |
What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force? |
| A. | Hysteresis |
| B. | Induction |
| C. | Retentivity |
| D. | Reluctance |
| Answer» B. Induction | |
| 13. |
The unit of flux density is known as |
| A. | magnetomotive force |
| B. | a weber |
| C. | a maxwell |
| D. | a tesla |
| Answer» E. | |
| 14. |
What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2, and a permeability of 2500 µWb/At·m? |
| A. | 833.33 µAt/Wb |
| B. | 833.33 µAt/Wb |
| C. | 1200 At/Wb |
| D. | More information is needed in order to find the reluctance. |
| Answer» D. More information is needed in order to find the reluctance. | |
| 15. |
Which electromagnetic device has a flexible cone? |
| A. | A speaker |
| B. | A dc generator |
| C. | A dc generator |
| D. | A solenoid |
| Answer» B. A dc generator | |
| 16. |
Which two values are plotted on a B-H curve graph? |
| A. | Reluctance and flux density |
| B. | Permeability and reluctance |
| C. | Magnetizing force and permeability |
| D. | Magnetizing force and permeability |
| Answer» E. | |
| 17. |
A Hall effect sensor |
| A. | exists only in theory |
| B. | is a noncontacting magnetic sensor |
| C. | can operate only a few times before failure |
| D. | can operate only a few times before failure |
| Answer» C. can operate only a few times before failure | |
| 18. |
What is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it? |
| A. | 13.33 mAt |
| B. | 300 At |
| C. | 75 At |
| D. | 152 At |
| Answer» C. 75 At | |
| 19. |
The component that produces power in an electromagnetic generator is called the |
| A. | armature |
| B. | field winding |
| C. | commutator D. |
| D. | commutator D. |
| Answer» B. field winding | |
| 20. |
"Series" and "parallel" as applied to dc motors refer to |
| A. | the connection of the motor and controller |
| B. | the connection of the motor and controller |
| C. | the connection of the motor and controller |
| D. | the connection of the motor batteries |
| Answer» C. the connection of the motor and controller | |
| 21. |
The Hall effect |
| A. | is a phenomenon with no practical applications |
| B. | is used in various sensor applications |
| C. | can develop potentials of thousands of volts |
| D. | is the basis for solar cell operation |
| Answer» C. can develop potentials of thousands of volts | |
| 22. |
What are the effects of moving a closed wire loop through a magnetic field? |
| A. | A voltage is induced in the wire. |
| B. | A current is induced in the wire. |
| C. | The polarity across the wire depends on the direction of motion. |
| D. | All of the above |
| Answer» E. | |
| 23. |
How much flux is there in a magnetic field when its flux density is 5000 mu.gifT and its cross-sectional area is 300 mm2? |
| A. | 16.67 mWb |
| B. | 5.0 mu.gifWb |
| C. | 3.0 mWb |
| D. | 1.5 mu.gifWb |
| Answer» E. | |
| 24. |
What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2? |
| A. | 12,000 mu.gifT |
| B. | 83,330 T |
| C. | 0 T |
| D. | More information is needed in order to find flux density. |
| Answer» B. 83,330 T | |
| 25. |
Which electromagnetic device uses brushes and a commutator? |
| A. | A speaker |
| B. | A dc generator |
| C. | A relay |
| D. | A solenoid |
| Answer» C. A relay | |
| 26. |
Permeability is the inverse equivalent of which electrical term? |
| A. | Voltage |
| B. | Current |
| C. | Resistance |
| D. | Conductance |
| Answer» D. Conductance | |
| 27. |
Which class or interface defines the wait(), notify(),and notifyAll() methods? |
| A. | Object |
| B. | Thread |
| C. | Runnable |
| D. | Runnable |
| Answer» B. Thread | |
| 28. |
Which of the following will not directly cause a thread to stop? |
| A. | notify() |
| B. | wait() |
| C. | InputStream access |
| D. | sleep() |
| Answer» B. wait() | |
| 29. |
Which method registers a thread in a thread scheduler? |
| A. | run(); |
| B. | construct(); |
| C. | start(); |
| D. | register(); |
| Answer» D. register(); | |
| 30. |
Which will contain the body of the thread? |
| A. | run(); |
| B. | run(); |
| C. | stop(); |
| D. | main(); |
| Answer» B. run(); | |
| 31. |
Which method must be defined by a class implementing the java.lang.Runnable interface? |
| A. | void run() |
| B. | public void run() |
| C. | public void start() |
| D. | void run(int priority) |
| Answer» C. public void start() | |
| 32. |
Which of the following will directly stop the execution of a Thread? |
| A. | wait() |
| B. | notify() |
| C. | notifyall() |
| D. | exits synchronized code |
| Answer» B. notify() | |
| 33. |
Which three guarantee that a thread will leave the running state? yield() wait() notify() notifyAll() sleep(1000) aLiveThread.join() Thread.killThread() |
| A. | 1, 2 and 4 |
| B. | 2, 5 and 6 |
| C. | 3, 4 and 7 |
| D. | 4, 5 and 7 |
| Answer» C. 3, 4 and 7 | |
| 34. |
Which two of the following methods are defined in class Thread? start() wait() notify() run() terminate() |
| A. | 1 and 4 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 2 and 4 |
| Answer» B. 2 and 3 | |
| 35. |
Which three are methods of the Object class? notify(); notifyAll(); isInterrupted(); synchronized(); interrupt(); wait(long msecs); sleep(long msecs); yield(); |
| A. | 1, 2, 4 |
| B. | 2, 4, 5 |
| C. | 1, 2, 6 |
| D. | 2, 3, 4 |
| Answer» D. 2, 3, 4 | |
| 36. |
Which two are valid constructors for Thread? Thread(Runnable r, String name) Thread() Thread(int priority) Thread(Runnable r, ThreadGroup g) Thread(Runnable r, int priority) |
| A. | 1 and 3 |
| B. | 2 and 4 |
| C. | 1 and 2 |
| D. | 2 and 5 |
| Answer» D. 2 and 5 | |
| 37. |
What is the name of the method used to start a thread execution? |
| A. | init(); |
| B. | start(); |
| C. | run(); |
| D. | resume(); |
| Answer» C. run(); | |
| 38. |
Which is a valid declarations of a String? |
| A. | String s1 = null; |
| B. | String s2 = null; |
| C. | String s3 = (String) abc; |
| D. | String s4 = (String) ufeed; |
| Answer» B. String s2 = null; | |
| 39. |
Which three are valid declarations of a float? float f1 = -343; float f2 = 3.14; float f3 = 0x12345; float f4 = 42e7; float f5 = 2001.0D; float f6 = 2.81F; |
| A. | 1, 2, 4 |
| B. | 2, 3, 5 |
| C. | 1, 3, 6 |
| D. | 2, 4, 6 |
| Answer» D. 2, 4, 6 | |
| 40. |
Which one is a valid declaration of a boolean? |
| A. | boolean b1 = 0; |
| B. | boolean b2 = false; |
| C. | boolean b3 = false; |
| D. | boolean b4 = Boolean.false() |
| Answer» D. boolean b4 = Boolean.false() | |
| 41. |
Which is the valid declarations within an interface definition? |
| A. | public double methoda(); |
| B. | public final double methoda(); |
| C. | static void methoda(double d1); |
| D. | protected void methoda(double d1); |
| Answer» B. public final double methoda(); | |
| 42. |
Which three are valid declarations of a char? char c1 = 064770; char c2 = 'face'; char c3 = 0xbeef; char c4 = \u0022; char c5 = '\iface'; char c6 = '\uface'; |
| A. | 1, 2, 4 |
| B. | 1, 3, 6 |
| C. | 3, 5 |
| D. | 5 only |
| Answer» C. 3, 5 | |
| 43. |
Which one of the following will declare an array and initialize it with five numbers? |
| A. | Array a = new Array(5); |
| B. | int [] a = {23,22,21,20,19}; |
| C. | int a [] = new int[5]; |
| D. | int [5] array; |
| Answer» C. int a [] = new int[5]; | |
| 44. |
Which three are legal array declarations? int [] myScores []; char [] myChars; int [6] myScores; Dog myDogs []; Dog myDogs [7]; |
| A. | 1, 2, 4 |
| B. | 2, 4, 5 |
| C. | 2, 3, 4 |
| D. | 2, 3, 4 |
| Answer» B. 2, 4, 5 | |
| 45. |
Which will legally declare, construct, and initialize an array? |
| A. | int [] myList = {"1", "2", "3"}; |
| B. | int [] myList = (5, 8, 2); |
| C. | int myList [] [] = {4,9,7,0}; |
| D. | int myList [] = {4, 3, 7}; |
| Answer» E. | |
| 46. |
Which four options describe the correct default values for array elements of the types indicated? int -> 0 String -> "null" Dog -> null char -> '\u0000' float -> 0.0f boolean -> true |
| A. | 1, 2, 3, 4 |
| B. | 1, 3, 4, 5 |
| C. | 2, 4, 5, 6 |
| D. | 3, 4, 5, 6 |
| Answer» C. 2, 4, 5, 6 | |