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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: crestfallen he returned as he had never faced such humiliation in the whole of his life.

A vainglorious

B triumphant

C indignant

D disturbed

Q2: A char variable can store either an ASCII character or a Unicode character.

A True

B False

Q3: Design a circuit using a 74121 to convert a 33-kHz, 30% duty cycle waveform to a 33-kHz, 60% duty cycle waveform.

A Rint = 2 k, Cext = 0.012 nF

B Rint = 2 k, Cext = 0.012 F

C Rint = 4 k, Cext = 0.012 F

D Rint = 4 k, Cext = 0.012 nF

Q4: What controls the output pulse width of a one shot?

A an RL time constant

B the width of the clock pulse

C an RC time constant

D the clock frequency

Q5: Does the 74123 one shot have an internal timing resistor?

A yes

B no

Q6: In a typical IC monostable multivibrator circuit, at the falling edge of the trigger input, the output switches HIGH for a period of time determined by the ________.

A amplitude of the input trigger

B value of the RC timing components

C magnitude of the dc supply voltage

D frequency of the input trigger

Q7: A monostable 555 timer has the following number of stable states:

A 1

B 3

C 0

D 2

Q8: What is the difference between a retriggerable one shot and a nonretriggerable one shot?

A The output pulse can be stretched with a nonretriggerable.

B The output pulse can be stretched with a retriggerable.

C The retriggerable can be triggered many times.

D The nonretriggerable can only be triggered once.

Q9: Triggering a retriggerable one shot during pulse generation will:

A double the original pulse width

B have no effect

C time out the original pulse

D extend the pulse to this trigger width

Q10:
What is the duty cycle of the waveform at the output of the circuit given below?

A 56%

B 50%

C 44%

D 78%