PG TRB COMPUTER INSTRUCTOR GRADE 1 STUDY MATERIAL - 10

1. Which of the following is non-saturating?

A.  TTL

B.  CMOS

C. ECL

D.  Both 1 and 2

2. The number of digits in octal system is .........

A.  8

B.  7

C.  9

D.  10

3. The access time of a word In 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is .........

A.  9.5 ns

B.  14.5 ns

C.  20 ns

D.  95 ns

4.The expression Y = pM (0, 1, 3, 4) is ..............

A.  POS

B.  SOP

C.  Hybrid

D.  none of these

5. An 8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If input is 10000000 the range of outputs is .............

A.  994 to 1014 μA

B.  990 to 1020 μA

C.  800 to 1200 μA

D.  None of the above

6. Decimal 43 in hexadecimal and BCD number system is respectively....... and ........

A.  B2 and 01000011

B.  2B and 01000011

C.  2B and 00110100

D.  B2 and 01000100

7. An AND gate has two inputs A and B and one inhibit input 3, Output is 1 if

A.  A = 1, B = 1, S = 1

B.  A = 1, B = 1, S = 0

C.  A = 1, B = 0, S = 1

D.  A = 1, B = 0, S = 0

8. The greatest negative number which can be stored is 8 bit computer using 2’s complement arithmetic is ........

A.  -256

B.  -128

C.  -255

 D.  -127

9. A JK flip flop has tpd= 12 ns. The largest modulus of a ripple counter using these flip flops and operating at 10 MHz is ........

A.  16

B.  64

C.  128

D.  256

10. The basic storage element in a digital system is .............

A.  flipflop

B.  counter

C.  multiplexer

D.  encoder