LOGIC CIRCUIT – Air – DGCA Question Bank For Politics

#1. What is an EPROM?

A memory that erases itself when the computer is switched off.

A memory that cannot be erased.

A memory that retains data when the computer is switched off but that can be re-programmed when necessary.

A memory that retains data when the computer is switched off and cannot be re-programmed.

#2. Which of the firewire elements must be activated to ring the fire bell in circuit below?

A + B or C + D.

A + C or B + D.

A + D or C + D.

Any of the above.

#3. What is a ROM?

A memory that erases itself when the computer is switched off.

A memory that cannot be erased.

A memory that retains data when the computer is switched off but that can be re-programmed when necessary.

A memory that retains data when the computer is switched off and cannot be re-programmed.

#4. An AND gate is sometimes referred to as?

An anything or nothing gate.

An all or nothing gate.

An everything and nothing.

A something or nothing gate.

#5. what does this represent?

Any or all gate.

All or nothing gate.

An inverted or NOT gate.

A something or nothing gate.

#6. What is the function of a NOT gate?

To invert the input so that an opposite output is produced.

To ensure that the output is the same as the input.

To ensure that no output can be given.

To ensure an output is given only when there is no input.

#7. C1, C2, C3 & C4 represent smoke detectors. which combination of smoke detectors activated will give a positive output at B?

C1 and C2 only.

C3 and C4 only.

C1 or C2 and C3 or C4.

None of the above.

#8. The device below will produce an output when?

Both A and B are logic zero.

Both A and B are logic one.

A is logic zero but B may be logic one or zero.

B must be logic one but A may be logic one or zero.

#9. The device below will produce an output when?

A is logic zero.

A is logic one.

A is logic zero or logic one.

It is a not gate so it will never give a positive output.

#10. The device below will produce a logic zero output when?

Both A and B are logic zero.

Both A and B are logic one.

A is logic zero and B is logic one.

B is logic zero and A is logic one.

#11. The circuit below will produce a logic one output when?

Both A and B are logic zero.

Both A and B are logic one.

A is logic zero and B is logic one.

B is logic zero and A is logic one.

#12. The circuit below will produce a logic zero output when?

Both A and B are logic zero.

Both A and B are logic one.

A is logic zero and B is logic one.

B is logic zero and A is logic one.

#13. The device below will produce a logic one output when?

Both A and B are logic zero.

Both A and B are logic one.

A is logic one and B is logic zero.

B is logic one and A is logic zero.

#14. The device below will produce a logic zero output when?

Both A and B must be logic zero.

A must be logic one and B may be one or zero.

A must be logic one and B is logic zero.

A and B or both A and B may be logic zero.

#15. The device below is?

An integrated AND gate.

A NAND gate.

A NOR gate.

An inhibited or negated AND gate.

#16. The device below will produce a logic zero output when?

Both A and B are logic zero.

Both A and B are logic one.

A is logic one and B is logic zero.

B is logic one and A is logic zero.

#17. The device below is?

Exclusive NOR gate.

Inclusive NAND gate.

Exclusive OR gate.

NOT gate.

#18. The device below will give a logic one output when?

A and B are the same.

A and B are both logic zero.

A and B are both logic one.

A and B are different.

#19. The device below will give a logic zero output when?

A and B are the same.

Only A or B are logic zero.

Only A or B are logic one.

A and B are different.

#20. In the circuit below, if A = 1, B = 0, C = 1 and D = 0, what will output E and F be?

0 0.

0 1.

1 1.

1 0.

#21. In the circuit below, if A = 1, B = 1, C = 1 and D = 0, what will output E and F be?

0 0.

0 1.

1 1.

1 0.

#22. In the circuit below, if A = 1, B = 0, C = 1 and D = 1, what will outputs E and F be ?

0 0.

0 1.

1 1.

1 0.

#23. In the circuit below, if A = 0, B = 0, C = 0 and D = 1, what will outputs E and F be?

0 0.

0 1.

1 1.

1 0.

#24. What inputs to A,B,C and D in the circuit below will give an output of E = 1, F = 1 ?

0,0,0,0.

0,0,0,1.

1,1,1,1.

None of the above.

#25. An EPROM? 1. Retains data when the computer is shut down. 2. Erases data when the computer is shut down. 3. Is read only memory. 4. Is read only in normal use but can be reprogrammed.

1,3.

2,4.

1,4.

2,3.

Dgca Question Bank For Pilots

Results

#1. What is an EPROM?

#2. Which of the firewire elements must be activated to ring the fire bell in circuit below?

#3. What is a ROM?

#4. An AND gate is sometimes referred to as?

#5. what does this represent?

#6. What is the function of a NOT gate?

#7. C1, C2, C3 & C4 represent smoke detectors. which combination of smoke detectors activated will give a positive output at B?

#8. The device below will produce an output when?

#9. The device below will produce an output when?

#10. The device below will produce a logic zero output when?

#11. The circuit below will produce a logic one output when?

#12. The circuit below will produce a logic zero output when?

#13. The device below will produce a logic one output when?

#14. The device below will produce a logic zero output when?

#15. The device below is?

#16. The device below will produce a logic zero output when?

#17. The device below is?

#18. The device below will give a logic one output when?

#19. The device below will give a logic zero output when?

#20. In the circuit below, if A = 1, B = 0, C = 1 and D = 0, what will output E and F be?

#21. In the circuit below, if A = 1, B = 1, C = 1 and D = 0, what will output E and F be?

#22. In the circuit below, if A = 1, B = 0, C = 1 and D = 1, what will outputs E and F be ?

#23. In the circuit below, if A = 0, B = 0, C = 0 and D = 1, what will outputs E and F be?

#24. What inputs to A,B,C and D in the circuit below will give an output of E = 1, F = 1 ?

#25. An EPROM? 1. Retains data when the computer is shut down. 2. Erases data when the computer is shut down. 3. Is read only memory. 4. Is read only in normal use but can be reprogrammed.