MCQOPTIONS
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MCQOPTIONS
This section includes 49 Mcqs, each offering curated multiple-choice questions to sharpen your Coal India knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The correct way to round off a floating number x to an integer value is |
| A. | y = int (x + 0.5) |
| B. | y = (int) (x + 0.5) |
| C. | y = (int) x + 0.5 |
| D. | y = (int) ((int)x + 0.5) |
| Answer» C. y = (int) x + 0.5 | |
| 2. |
What does the following declaration mean? int (*ptr) [10]; |
| A. | ptr is an array of pointers of 10 integers. |
| B. | ptr is a pointer to an array of 10 integers. |
| C. | ptr is an array of 10 integers. |
| D. | None of the above |
| Answer» C. ptr is an array of 10 integers. | |
| 3. |
How to make an infinity loop in C? |
| A. | loop: ..... goto loop; |
| B. | for(;;) { } |
| C. | while(1) { } |
| D. | All of the above |
| Answer» E. | |
| 4. |
Type of data and its value is described dy |
| A. | Constants |
| B. | Variables |
| C. | Data Type |
| D. | None of the above |
| Answer» C. Data Type | |
| 5. |
The Case keyword is followed by? |
| A. | Float values |
| B. | Character values |
| C. | Integer values |
| D. | Both b&c |
| Answer» E. | |
| 6. |
A full binary tree with n leaves contains |
| A. | n nodes |
| B. | 2n - 1 nodes |
| C. | log2 n nodes |
| D. | 2n nodes |
| Answer» C. log2 n nodes | |
| 7. |
Which of the following storage classes have global visibility in C? |
| A. | Auto |
| B. | Static |
| C. | Extern |
| D. | Register |
| Answer» D. Register | |
| 8. |
How many times is a do while loop guaranteed to loop? |
| A. | 0 |
| B. | Variable |
| C. | 1 |
| D. | Infinitely |
| Answer» D. Infinitely | |
| 9. |
Which of the following sorting algorithms does NOT have a worst-case running time of O(n2)? |
| A. | Insertion sort |
| B. | Merge sort |
| C. | Quicksort |
| D. | Bubble sort |
| Answer» C. Quicksort | |
| 10. |
Which data structure type is NOT linear from the following? |
| A. | Doubly Link List |
| B. | 2D Array |
| C. | Binary Search Tree |
| D. | Queue |
| Answer» D. Queue | |
| 11. |
What is the purpose of getc() |
| A. | read a character from STDIN |
| B. | read a character from a file |
| C. | read all file |
| D. | read file randomly |
| Answer» C. read all file | |
| 12. |
Which of the following is not an iterative statement |
| A. | while |
| B. | do while |
| C. | switch |
| D. | for |
| Answer» D. for | |
| 13. |
Which is an invalid name of identifier? |
| A. | world |
| B. | addition23 |
| C. | test-name |
| D. | factorial |
| Answer» D. factorial | |
| 14. |
Which of these assignments is invalid? |
| A. | short s = 48; |
| B. | float f = 4.3; |
| C. | double d = 4.3; |
| D. | int I = `1`; |
| Answer» E. | |
| 15. |
Which logic gate has output high if and only if all inputs are low ———? |
| A. | NOR |
| B. | NAND |
| C. | X-NOR |
| D. | AND |
| Answer» C. X-NOR | |
| 16. |
How many NAND gates are needed to realize OR gate ————– |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 17. |
By adding inverters to the inputs and output of a AND gate we can obtain …………… |
| A. | OR |
| B. | AND |
| C. | NOT |
| D. | X-OR |
| Answer» E. | |
| 18. |
which logic gate has the output is compliment of its input ———- |
| A. | OR |
| B. | AND |
| C. | NOT |
| D. | X-OR |
| Answer» D. X-OR | |
| 19. |
how many flip-flops are required to construct Mod -12 counter |
| A. | 5 |
| B. | 4 |
| C. | 12 |
| D. | none |
| Answer» C. 12 | |
| 20. |
the radix or base of hexadecimal number system is ———– |
| A. | 8 |
| B. | 16 |
| C. | 5 |
| D. | none of these |
| Answer» C. 5 | |
| 21. |
Convert the 101101 Binary number into octal no |
| A. | 65 |
| B. | 55 |
| C. | 51 |
| D. | 45 |
| Answer» C. 51 | |
| 22. |
Which one of the following is not a semiconductor? |
| A. | Diamond |
| B. | Galtium‐Arsenide |
| C. | Silicon |
| D. | Germanium |
| Answer» B. Galtium‐Arsenide | |
| 23. |
A Zenor Diode is invariably used with |
| A. | Forward bias |
| B. | Reverse bias |
| C. | Zero bias |
| D. | Either of A or C |
| Answer» C. Zero bias | |
| 24. |
The relation between the number of pairs (p) forming a kinematic chain and the number of links (k) is given by |
| A. | K = p = 1 |
| B. | K= 2p – 2 |
| C. | K = 2p – 3 |
| D. | K = 2p ‐4 |
| Answer» B. K= 2p – 2 | |
| 25. |
The Factories employing more than 1000 workers are required to submit their plan for approval to |
| A. | Deputy Chief Inspector of Factories |
| B. | Joint Chief Inspector of Factories |
| C. | Chief Inspector of Factories |
| D. | Additional Chief Inspector of Factories |
| Answer» D. Additional Chief Inspector of Factories | |
| 26. |
A general manager of a company can be appointed as a occupier of a company. |
| A. | True |
| B. | False |
| Answer» C. | |
| 27. |
Where ————or more workers are employed in a factory, then there shall be a Safety Committee in the factory. |
| A. | 100 or more workers |
| B. | 150 or more workers |
| C. | 200 or more workers |
| D. | 250 or more workers |
| Answer» E. | |
| 28. |
Which one of the following would qualify to be a strategic HRM activity? |
| A. | Administer Wage & Salary Programmes |
| B. | Prepare Staffing Plans |
| C. | Determine the level & type of Performance that is crucial for firm’s growth |
| D. | Use specific job skill training |
| Answer» D. Use specific job skill training | |
| 29. |
Which one of the following is not a valid Wage Theory? |
| A. | The Just Wage Theory |
| B. | Subsistence Theory |
| C. | Standard of Living Theory |
| D. | Best Wage Theory |
| Answer» E. | |
| 30. |
The phase lead compensation is used t |
| A. | Increase rise time and decrease overshoot |
| B. | Decrease both rise time and overshoot |
| C. | Increase both rise time and overshoot |
| D. | Decrease rise time and increase overshoot |
| Answer» E. | |
| 31. |
i. (X’+Y’) A. Low-pass filter function ii. (X’Y’) B. Sum iii. (XY) C. NAND D. Carry E.NOR |
| A. | i-C, ii-E, iii-D |
| B. | i-C, ii-E, iii-B |
| C. | i-C, ii-B, iii-D |
| D. | i-C, ii-E, iii-A |
| Answer» B. i-C, ii-E, iii-B | |
| 32. |
In Gauss Seidel method the following factors are influenced for operation |
| A. | Acceleration factor |
| B. | Selection of slack buss |
| C. | Both |
| D. | None |
| Answer» C. Both | |
| 33. |
When sine wave is given as input to Schmitt trigger then its generates |
| A. | Sine wave |
| B. | Saw tooth wave |
| C. | Triangle wave |
| D. | Square wave |
| Answer» E. | |
| 34. |
Hays bridge is used to measure___________ and Schering bridge is used to measure____________ |
| A. | Inductance, Inductance |
| B. | Inductance, Capacitance |
| C. | Capacitance, Inductance |
| D. | Resistance, Capacitance |
| Answer» C. Capacitance, Inductance | |
| 35. |
The two watt meters measurement the ratio of two meter readings is –(1-sqrt3):( 1+sqrt3) then the power factor is |
| A. | 1 |
| B. | 0.866 |
| C. | 0.707 |
| D. | 0 |
| Answer» D. 0 | |
| 36. |
Thermocouple is used to measure |
| A. | AC |
| B. | DC |
| C. | Both |
| D. | None |
| Answer» D. None | |
| 37. |
A 3-phase 50HZ SCIM takes a power input of 30 KW at its full load speed of 1440 rpm. Total stator losses are 1 KW. The slip and rotor ohmic losses at full load are |
| A. | 0.02, 600 W |
| B. | 0.04, 580 W |
| C. | 0.04, 1160 W |
| D. | 0.04, 1200 W |
| Answer» D. 0.04, 1200 W | |
| 38. |
A CRO screen has ten divisions on the horizontal scale. If a voltage signal 5 sin 314t+45 deg)is examined with a line base settings of 5 msec/div, the number of cycles of signal displayed on the screen will be |
| A. | 0.5 cycles |
| B. | 2.5 cycles |
| C. | 5 cycles |
| D. | 10 cycles |
| Answer» C. 5 cycles | |
| 39. |
In an induction machine, if the air gap increased |
| A. | Speed will be reduced |
| B. | Efficiency will be improved |
| C. | Power factor will be lowered |
| D. | Breakdown torque will be reduced |
| Answer» D. Breakdown torque will be reduced | |
| 40. |
Moving coil in dynamometer wattmeter connected |
| A. | In series with fixed coil |
| B. | Across supply |
| C. | In series with load |
| D. | Across load |
| Answer» C. In series with load | |
| 41. |
A dc cumulatively compounded motor delivers rated load torque at rated speed. If series field is short circuited, then the armature current and speed will |
| A. | Both increases |
| B. | Both decreases |
| C. | Increases and decreases |
| D. | Decreases and increases |
| Answer» B. Both decreases | |
| 42. |
A 0-10 mA PMMC ammeter reads 5mA in a circuit; its bottom control spring snaps out suddenly the meter will now read. |
| A. | 5mA |
| B. | 10mA |
| C. | 2.5mA |
| D. | 0 |
| Answer» E. | |
| 43. |
Which one of the following statements for a dc machine which is provided with inter pole winding (IW) as well as compensating winding (CW) is correct |
| A. | Both IW and CW are connected in series with Armature winding |
| B. | Both IW and CW are connected in parallel with Armature winding |
| C. | IW connected in series but CW is connected in parallel with Armature winding |
| D. | CW connected in series but IW is connected in parallel with Armature winding |
| Answer» B. Both IW and CW are connected in parallel with Armature winding | |
| 44. |
The transfer function of a system is 10/(1+s) when operating as a unity feedback system, the steady state error to a step input will be |
| A. | 0 |
| B. | 1/11 |
| C. | 10 |
| D. | Infinity |
| Answer» C. 10 | |
| 45. |
In a thyristor Latching current is ________ than Holding current |
| A. | Equal |
| B. | Less |
| C. | Greater |
| D. | None |
| Answer» D. None | |
| 46. |
Which is the most suitable power device for high frequency ( more 100 kHz) switching application? |
| A. | Power MOSFET |
| B. | BJT |
| C. | SCR |
| D. | UJT |
| Answer» B. BJT | |
| 47. |
Mho relay is usually employed for the protection of |
| A. | Short lines only |
| B. | Medium lines only |
| C. | Long lines only |
| D. | Any line |
| Answer» D. Any line | |
| 48. |
In a synchronous alternator, the armature reaction is solely determined by |
| A. | Power factor of the load |
| B. | Amount of current drawn from the alternator |
| C. | Speed of the prime mover driving the alternator |
| D. | Excitation voltage |
| Answer» B. Amount of current drawn from the alternator | |
| 49. |
The Function of Shunt in an Ammeter is |
| A. | To bypass the current |
| B. | To increase the Resistance of the meter |
| C. | To decrease the voltage drop |
| D. | To increase the current in the meter coil |
| Answer» B. To increase the Resistance of the meter | |