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Directions to Solve

Each sentences below consist of a word or a phrase which is bold. It is followed by four words or phrases. Select the word or pharse which is closes to the OPPOSITE in meaning of the bold word or phrase.

Q1: Feasibility of the project is under study.

A unsuitability

B cheapness

C impropriety

D impracticability

Q2:
The way the break is used to take control out of switch and continue to take control of the beginning of the switch?

A No

B Yes

Q3: What is the pulse width of the output of a 74123 if an external 4.7-k resistor and a 0.022-F capacitor are used?

A 33.3 s

B 290 ms

C 29 ms

D 290 s

Q4: To obtain a 50% duty cycle in an astable 555 timer circuit:

A tLO = tHI

B RA = RB and short RB with a diode during the capacitor charging cycle

C tLO = tHI, RA = RB, and short RB with a diode during the capacitor charging cycle

D capacitor voltage must rise above 1/3 VCC

Q5: What is another name for a bistable multivibrator?

A an on-off switch

B a flip-flop

C an oscillator

Q6: An astable 555 timer has the following number of stable states:

A 3

B 2

C 1

D 0

Q7: Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?

A Schmitt triggering

B astable

C pulse stretching

D monostable

Q8: A 0.3-F capacitor has an initial charge of 2.7 V. If it is discharged through a 10-k resistor for 6.5 ms, how much voltage will be left across the capacitor?

A 2.295 V

B 0.0 V

C 2.7 V

D 0.309 V

Q9:
Is the circuit given below an astable multivibrator or a monostable multivibrator?

A astable

B monostable

Q10: Which of the following is NOT a characteristic of a retriggerable monostable multivibrator?

A none of the above

B It has no internal timing resistor.

C It has an active-HIGH reset, which terminates all timing functions.

D It is a dual multivibrator.