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1443 studying

Total questions: 62

Worksheet time: 31hrs 0mins

Name
Class
Date
1.

Convert 1101₂ to decimal.

a)

12

b)

13

c)

14

d)

15

2.

Convert 47₁₀ to binary.

a)

100111

b)

101111

c)

111111

d)

100101

3.

Convert 2A₁₆ to decimal.

a)

40

b)

41

c)

42

d)

43

4.

What base is binary?

a)

2

b)

8

c)

10

d)

16

5.

Which binary value equals decimal 9?

a)

1000

b)

1001

c)

1010

d)

1111

6.

Convert 1010₂ to hexadecimal.

a)

A

b)

B

c)

C

d)

D

7.

Decimal 15 in hex equals _.

a)

F

b)

E

c)

A

d)

C

8.

Binary 11110000 equals decimal _

a)

240

b)

120

c)

255

d)

200

9.

Convert 255₁₀ to hex.

a)

FF

b)

EE

c)

FE

d)

EF

10.

Convert 3C₁₆ to binary.

a)

111100

b)

110011

c)

101110

d)

100111

11.

AND gate outputs 1 only when

a)

One input is 1

b)

Both inputs are 1

c)

Both inputs are 0

d)

Inputs differ

12.

OR gate outputs 0 when _

a)

All inputs are 0

b)

All inputs are 1

c)

Inputs differ

d)

Any input is 1

13.

Q13. XOR gate outputs 1 when

a)

Inputs are different

b)

Inputs are same

c)

Both inputs are 1

d)

Both inputs are 0

14.

NAND is the opposite of which gate?

a)

OR

b)

XOR

c)

AND

d)

NOR

15.

For inputs A=1, B=0, what is output of A NOR B?

a)

0

b)

1

c)

2

d)

Undefined

16.

For A=1, B=1, XOR output is

a)

0

b)

1

c)

2

d)

3

17.

Which gate is “NOT OR”?

a)

NOR

b)

NAND

c)

XNOR

d)

XOR

18.

Which gate acts as equality checker?

a)

XNOR

b)

AND

c)

NAND

d)

OR

19.

Q19. The opposite of NOR is __

a)

OR

b)

AND

c)

NAND

d)

XOR

20.

What is the output of an AND gate if A=0, B=1?

a)

0

b)

1

c)

2

d)

3

21.

High Selector outputs

a)

Lowest input

b)

Average input

c)

Highest input

d)

Midrange input

22.

Q22. Low Selector outputs _

a)

Lowest input

b)

Highest input

c)

Average input

d)

Random input

23.

Inputs: 7 psi, 12 psi. High selector output?

a)

12 psi

b)

7 psi

c)

19 psi

d)

5 psi

24.

Q24. Inputs: 18 psi, 22 psi. Low selector output?

a)

18 psi

b)

22 psi

c)

20 psi

d)

0 psi

25.

If High Limit = 10 psi and signal = 12 psi, output =

a)

10 psi

b)

12 psi

c)

0 psi

d)

8 psi

26.

If Low Limit = 5 psi and signal = 2 psi, output =

a)

5 psi

b)

2 psi

c)

7 psi

d)

0 psi

27.

Selector logic is used to

a)

Compare signals

b)

Create new setpoints

c)

Filter noise

d)

Amplify input

28.

A low selector passes the

a)

Higher of two inputs

b)

Lower of two inputs

c)

Sum of inputs

d)

Fixed setpoint

29.

Q29. A limiter ensures output never exceeds

a)

Its limit value

b)

The input value

c)

The supply voltage

d)

The frequency

30.

Selector blocks are common in _

a)

Control loops

b)

Temperature sensors

c)

Relays

31.

A High Alarm activates when PV

a)

Increases past setpoint

b)

Drops below setpoint

c)

Equals zero

d)

Power fails

32.

A Low Alarm activates when PV ___

a)

Falls below setpoint

b)

Rises above setpoint

c)

Equals the setpoint

d)

Is unchanged

33.

Q33. Fail-safe wiring means alarm trips when ___?

a)

Power is lost

b)

Power is restored

c)

System is idle

d)

Manual reset is done

34.

Which is safer: Energize-to-trip or De-energize-to-trip?

a)

De-energize-to-trip

b)

Energize-to-trip

c)

Trip-to-energize

d)

Trip-to-de-energize

35.

What type of contact is used for fail-safe alarms?

a)

Normally open

b)

Normally closed

c)

Either

d)

Neither

36.

If a wire breaks in a fail-safe circuit, the alarm ___

a)

Activates

b)

Deactivates

c)

Remains unchanged

d)

Delays

37.

In a High Alarm, PV=90%, SP=80%, alarm state?

a)

Active

b)

Inactive

c)

Acknowledged

d)

Disabled

38.

In a Low Alarm, PV=10%, SP=20%, alarm state?

a)

Active

b)

Inactive

c)

Fault

d)

Unchanged

39.

What happens to alarm output on power loss?

a)

Goes to alarm state

b)

Remains unchanged

c)

Activates backup power

d)

Turns off completely

40.

The main purpose of fail-safe design is ___

a)

Safety

b)

Efficiency

c)

Cost reduction

d)

Aesthetics

41.

Q42. “NC” contact means _

a)

Closed when idle

b)

Open when idle

c)

Never closes

d)

Normally Closed

42.

SPDT switch stands for

a)

Single Pole Double Throw

b)

Single Pole Double Tap

c)

Single Pin Double Throw

d)

Single Pin Double Tap

43.

The symbol for a relay coil looks like

a)

Circle with “M”

b)

Zigzag resistor

c)

Loop or coil shape

d)

Triangle

44.

A solenoid symbol represents

a)

An electrically actuated valve

b)

A manually operated switch

c)

A pressure gauge

d)

A flow meter

45.

A high selector symbol indicates

a)

Output follows highest input

b)

Output follows lowest input

c)

Output is always zero

d)

Output is always one

46.

Alarm bell symbol means

a)

Audible alarm

b)

Fire exit

c)

Emergency stop

d)

First aid

47.

NC contact opens when

a)

Actuated

b)

Deactuated

c)

Powered off

d)

Disconnected

48.

Q49. The dotted line between two symbols usually shows _

a)

Mechanical linkage

b)

Electrical connection

c)

Signal flow

d)

Data transmission

49.

Which contact type passes current only when actuated?

a)

Normally Open

b)

Normally Closed

c)

Double Throw

d)

Latching

50.

Ohm’s Law states:

a)

V = I x R

b)

V = R / I

c)

I = V + R

d)

R = V x I

51.

If I=2 A, R=10 Ω, V=?

a)

20 V

b)

5 V

c)

12 V

d)

0.2 V

52.

Two 10 Ω resistors in series total

a)

20 Ω

b)

10 Ω

c)

5 Ω

d)

100 Ω

53.

Q54. Two 10 Ω resistors in parallel total _

a)

5 Ω

b)

10 Ω

c)

20 Ω

d)

2 Ω

54.

Current in a series circuit is

a)

Same everywhere

b)

Different in each resistor

c)

Zero

d)

Doubled

55.

Voltage in a parallel circuit is

a)

Same across each branch

b)

Different across each branch

c)

Zero across each branch

d)

Depends on the number of branches

56.

Resistance increases when __

a)

Length of conductor increases

b)

Thickness of conductor increases

c)

Temperature decreases

d)

Material becomes a better conductor

57.

What unit measures current?

a)

Ampere

b)

Volt

c)

Ohm

d)

Watt

58.

What happens to current if voltage increases and resistance is constant?

a)

Increases

b)

Decreases

c)

Remains the same

d)

Becomes zero

59.

What is the total voltage if three 5V cells are in series?

a)

15 V

b)

5 V

c)

10 V

d)

20 V

60.

Which logic gate outputs 0 only when all inputs are 1?

a)

NAND

b)

OR

c)

XOR

d)

AND

61.

What does a normally closed contact do when actuated?

a)

Activates alarm

b)

Opens the circuit

c)

Closes the circuit

d)

Increases voltage

62.

Convert 1010₂ to decimal.

a)

8

b)

9

c)

10

d)

11

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