CS302 QUIZ 1 SOLVED
1. The terminal count of a 4-bit binary counter in the UP mode is.
a) 1100
b) 0011
c) 1111
d) 0000
2. For a down counter that counts from (111 to 000). If current state is “101” the next state will be .
a) 111
b) 110
c) 010
d) None of given options
3. The n flip-flops store states.
a) 1
b) 2^n
c) 0
d) 2^(n+1)
4. An Asynchronous Down-counter is implemented (using J-K flip-flop) by connecting.
a) Q output of all flip-flops to clock input of next flip-flops
b) Q’ output of all flip-flops to clock input of next flip-flops
c) Q output of all flip-flops to J input of next flip-flops
d) Q’ output of all flip-flops to K input of next flip-flops
5. In case of cascading Integrated Circuit counters, the enable inputs and RCO of the Integrated Circuit counters allow cascading of multiple counters together.
a) True
b) False
6. A decade counter can be implemented by truncating the counting sequence of a MOD-20 counter.
a) True
b) False
7. The 74HC163 is a 4-bit Synchronous Counter, it has data output pins.
a) 2
b) 4
c) 6
d) 8
8. Counters as the name indicates are not triggered simultaneously
a) Asynchronous
b) Synchronous
c) Positive-Edge triggered
d) Negative-Edge triggered
9. Divide-by-32 counter can be achieved by using
a) Flip-Flop and DIV 10
b) Flip-Flop and DIV 16
c) Flip-Flop and DIV 32
d) DIV 16 and DIV 32
10. The input overrides the input
a. Asynchronous, synchronous
b) Synchronous, asynchronous
c) Preset input (PRE), Clear input (CLR)
d) Clear input (CLR), Preset input (PRE)
11. The synchronous counters are also known as Ripple Counters:
a) True
b) False
12. With a 100 KHz clock frequency, eight bits can be serially entered into a shift register in
a) 80 micro seconds
b) 8 micro seconds
c) 80 mili seconds
d) 10 micro seconds
13. Number of states in an 8-bit Johnson counter sequence are:
a) 8
b) 12
c) 14
d) 16
14. A synchronous decade counter will have flip-flops
a) 3
b) 4
c) 7
d) 10
15. is one of the examples of synchronous inputs.
a) J-K input
b) EN input
c) Preset input (PRE)
d) Clear input (CLR)
16. A decade counter is
a) Mod-3 counter
b) Mod-5 counter
c) Mod-8 counter
d) Mod-10 counter
17. In gated SR latch, what is the value of the output if EN=1, S=0 and R=1?
a) Qt
b) 0
c) 1
d) Invalid
18. A Divide-by-20 counter can be achieved by using
a) Flip-Flop and DIV 10
b) Flip-Flop and DIV 16
c) Flip-Flop and DIV 32
d) DIV 10 and DIV 16
19. A one-shot mono-stable device contains _
a) AND gate, Resistor, Capacitor and NOT Gate
b) NAND gate, Resistor, Capacitor and NOT Gate
c) NOR gate, Resistor, Capacitor and NOT Gate
d) XNOR gate, Resistor, Capacitor and NOT Gate
20. The inputs can be directly mapped to Karnaugh maps.
a) S-R
b) J-K
c) Flip-Flop
d) External
21. A mono-stable device only has a single stable state
a) True
b) False
22. The minimum time required for the input logic levels to remain stable before the clock transition occurs is known as the
a) Set-up time
b) Hold time
c) Pulse interval time
d) Pulse stability time (PST)
23. The low to high or high to low transition of the clock is considered to be a(n)
a) State
b) Edge
c) Trigger
d) One-shot
24. A 4-bit UP/DOWN counter is in DOWN mode and in the 1010 state, on the next clock pulse, to what state does the counter go?
a) 1001
b) 1011
c) 0011
d) 1100
25. When the Hz sampling interval is selected, the signal at the output of the J-K flip-flop has a time period of seconds.
a) 1, 2
b) 0, 2
c) 2, 5
d) 1, 1
26. Assume a J-K flip-flop has 1s on the J and K inputs. The next clock pulse will cause the output to .
a) Set
b) Toggle
c) Latch
d) Reset
27. A stage in the shift register consists of
a) A latch
b) A flip flop
c) A byte of storage
d) Four bits of storage
28. When the both inputs of edge-triggered J-K flop-flop are set to logic zero
a) The flop-flop is triggered
b) Q=0 and Q’=1
c) Q=1 and Q’=0
d) The output of flip-flop remains unchanged
29. A positive edge-triggered flip-flop changes its state when
a) Enable input (EN) is set
b) Preset input (PRE) is set
c) Low-to-high transition of clock
d) High-to-low transition of clock
30. If a circuit suffers “Clock Skew” problem, the output of circuit can’t be guaranteed.
a) True
b) False
31. The minimum time for which the input signal has to be maintained at the input of flip-flop is called of the flip-flop.
a) Set-up time
b) Hold time
c) Pulse interval time
d) Pulse stability time (PST)
34. A modulus-14 counter has fourteen states requiring
a) 14 flip flops
b) 14 registers
c) 4 flip flops
d) 4 registers
35. In Master-Slave flip-flop the clock signal is connected to slave flip-flop using gate.
a) AND
b) OR
c) NOT
d) NAND
36. flip-flops are obsolete now.
a) Edge-triggered
b) Master-Slave
c) T-flipflop
d) D-flipflop
37. The operation of J-K flip-flop is similar to that of the SR flip-flop except that the J-K flip flop
a) Doesn’t have an invalid state
b) Sets to clear when both J=0 and K=0
c) It does not show transition on change in pulse
d) It does not accept asynchronous inputs
38. The glitches due to “Race Condition” can be avoided by using a .
a) Gated flip-flops
b) Pulse triggered flip-flops
c) Positive-Edge triggered flip-flops
d) Negative-Edge triggered flip-flops
39. For a gated D-Latch if EN=1 and D=1 then Q(t+1) =
a) 0
b) 1
c) Q(t)
d) Invalid
40. occurs when the same clock signal arrives at different times at different clock inputs due to propagation delay.
a) Race condition
b) Clock skew
c) Ripple effect
d) None of the given options
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