AP ECET EEE 2020-9

1. The frequency of oscillations of Colpitt's oscillator w0 is given by

A. Sqrt((C1+C2)/(C1C2L))
B. Sqrt((C1C2)/(C1L+C2L))
C. Sqrt((C1+C2L)/(C1C2))
D. Sqrt((C1)/(C2L))

Answer : A. Sqrt((C1+C2)/(C1C2L))
Explanation:-

2. An oscillator cannot be used to produce ________ frequencies

A. High
B. Audio
C. Very High
D. Very Low

Answer : D. Very Low
Explanation:-

3. The sum of two octal numbers 75 and 256 is

A. 331
B. 353
C. 352
D. 341

Answer : B. 353
Explanation:-

4. The AND gate can be constructed with two ______ gates

A. NAND
B. EX-OR
C. NOR
D. EX-NOR

Answer : NAND
Explanation:-

5. As compared to MOS memories, bipolar memories are

A. Slower access time but are cheaper
B. Slower access time and are costly
C. Faster access time and are cheaper
D. Faster access time and are cheaper

Answer : D. Faster access time and are cheaper
Explanation:-

6. An 8*bit counter ADC operates on 1MHZ clock. Its average conversion time is

A. 0.258 milli sec
B. 1.028 micro sec
C. 0.128 milli sec
D. 128 nano sec

Answer : C. 0.128 milli sec
Explanation:-

7. During forward blocking state a thyristor is associated with

A. Large current, low voltage
B. low current, large voltage
C. Large current, large voltage
D. medium current, low voltage

Answer : B. low current, large voltage
Explanation:-

8. The VI Characteristics of UJT is

A. Similar to CE with a linear and saturation region
B. Similar to FET with a linear and pinch off region
C. similar to tunnel diode in some respects
D. similar to PN junction diode in some respects

Answer : C. similar to tunnel diode in some respects
Explanation:-

9. UJT when used for triggering an SCR, has the waveform

A. Sine wave
B. sawtooth wave
C. square wave
D. trapezoidal

Answer : B. sawtooth wave
Explanation:-

10. The object of connecting resistance and capacitance across gate circuit is to protest SCR gate against

A. Noise signals
B. Over voltages
C. Over currents
D. dv/dt

Answer : A. Noise signals
Explanation:-