AP ECET EEE 2018-9

1. The phase shift oscillator generally contains _______

A. four stages of RC circuit
B. Three stages of RC circuit
C. Two stages of RC circuit
D. One stage of RC circuit

Answer : B. Three stages of RC circuit
Explanation:-

2. ________ oscillator is the most stable oscillator

A. Crystal controlled
B. Weinbridge
C. colpitts
D. Hartley

Answer : A. Crystal controlled
Explanation:-

3. The base of the hexadecimal number system is ______

A. 2
B. 8
C. 10
D. 16

Answer : D. 16
Explanation:-

4. The gate whose output is high, if any of its inputs is high is _____

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

Answer : B. OR
Explanation:-

5. The memory used for main memory in a hand calculator is _____

A. RAM
B. ROM
C. PROM
D. EPROM

Answer : B. ROM
Explanation:-

6. Which of the following is the fastest A to D converter ?

A. Successive approximation converter
B. Counter type converter
C. Comparator converter
D. Dual slope converter

Answer : C. Comparator converter
Explanation:-

7. An SCR is a _____ switch

A. Unidirectional
B. Two directional
C. Three-directional
D. Four-directional

Answer : A. Unidirectional
Explanation:-

8. Turn-on time of an SCR can be reduced by using a _____

A. rectangular pulse of low amplitude and wide width
B. rectangualr pulse of high amplitude and narrow width
C. Triangular pulse
D. Trapezoidal pulse

Answer : B. rectangualr pulse of high amplitude and narrow width
Explanation:-

9. In an UJT, maximum value of charging resistance is associated with ____

A. peak point
B. valley point
C. Any point between peak and valley point
D. After the valley point

Answer : A. peak point
Explanation:-

10. The TRIAC can be used only in _____

A. Inverter
B. Rectifier
C. Multiquadrant chopper
D. Cycloconverter

Answer : C. Multiquadrant chopper
Explanation:-