Computer Fundamentals (Number System)

1. The digital systems usually operate on ........system.
(a) binary
(b) decimal
(c) octal
(d) hexadecimal.

2. The binary system uses powers of ........for positional values.
(a) 2
(b) 10
(c) 8
(d) 16

3. After counting 0, 1, 10, 11, the next binary number is
(a) 12
(b) 100
(c) 101
(d) 110.

4. The number 10002 is equivalent to decimal number
(a) one thousand
(b) eight
(c) four
(d) sixteen.

5. In binary numbers, shifting the binary point one place to the right.
(a) multiplies by 2
(b) divides by 2
(c) decreases by 10
(d) increases by 10.

6. The binary addition 1 + 1 + 1 gives
(a) 111
(b) 10
(c) 110
(d) 11

7. The cumulative addition of the four binary bits ( 1 + 1 + 1 + 1) gives
(a) 1111
(b) 111
(c) 100
(d) 1001

8. The result of binary subtraction (100 − 011) is
(a) −111
(b) 111
(c) 011
(d) 001.

9. The 2's complement of 10002 is
(a) 0111
(b) 0101
(c) 1000
(d) 0001

10. The chief reason why digital computers use complemental subtraction is that it
(a) simplifies their circuitry
(b) is a very simple process
(c) can handle negative numbers easily
(d) avoids direct subtraction.

11. The result of binary multiplication 1111 × 102 is
(a) 1101
(b) 0110
(c) 1001
(d) 1110

12. The binary division 110002 ÷ 1002 gives
(a) 110
(b) 1100
(c) 11
(d) 101

13. The number 128 is equivalent to decimal
(a) 12
(b) 20
(c) 10
(d) 4

14. The number 1001012 is equivalent to octal
(a) 54
(b) 45
(c) 37
(d) 25.

15. The number 178 is equivalent to binary
(a) 111
(b) 1110
(c) 10000
(d) 1111.

16. Which of the following is NOT an octal number?
(a) 19
(b) 77
(c) 15
(d) 101


17. Hexadecimal number system is used as a shorthand language for representing .......numbers.
(a) decimal
(b) binary
(c) octal
(d) large

18. The binary equivalent of A16 is
(a) 1010
(b) 1011
(c) 1000
(d) 1110.

19. BCD code is
(a) non-weighted
(b) the same thing as binary numbers
(c) a binary code
(d) an alphanumeric code.

20. Which of the following 4-bit combinations is/are invalid in the BCD code ?
(a) 1010
(b) 0010
(c) 0101
(d) 1000.

21. Octal coding involves grouping the bits in
(a) 5's
(b) 7's
(c) 4's
(d) 3's.

22. In Excess-3 code each coded number is .......than in BCD code.
(a) four larger
(b) three smaller
(c) three larger
(d) much larger.

23. Which numbering system uses numbers and
letters as symbols ?
(a) decimal
(b) binary
(c) octal
(d) hexadecimal

24. To convert a whole decimal number into a hexadecimal equivalent, one should divide the
decimal value by.......
(a) 2
(b) 8
(c) 10
(d) 16.

Answers
1. (a) 2. (a) 3. (b) 4. (b) 5. (a) 6. (d) 7. (b) 8. (d) 9. (c) 10. (a) 11. (d) 12. (a) 13. (c) 14. (b) 15. (d) 16. (a) 17. (a) 18. (a) 19. (c) 20. (a) 21. (d) 22. (c) 23. (d) 24. (a)

Comments

Post a Comment

Popular posts from this blog

Electrical Machines (Three Phase Transformers)

1. Which of the following connections is best suited for 3-phase, 4-wire service ? (a) Δ − Δ (b) Y − Y (c) Δ − Y (d) Y − Δ 2. In a three-phase Y-Y transformer connection, neutral is fundamental to the (a) suppression of harmonics (b) passage of unbalanced currents due to unbalanced loads (c) provision of dual electric service (d) balancing of phase voltages with respect to line voltages. 3. As compared to Δ − Δ bank, the capacity of the V − V bank of transformers is ......... percent. (a) 57.7 (b) 66.7 (c) 50 (d) 86.6 4. If three transformers in a Δ − Δ are delivering their rated load and one transformer is removed, then overload on each of the remaining transformers is ......... percent. (a) 66.7 (b) 173.2 (c) 73.2 (d) 58 5. When a V − V system is converted into a Δ − Δ system, increase in capacity of the system is ......... percent. (a) 86.6 (b) 66.7 (c) 73.2 (d) 50 6. For supplying a balanced 3 − φ load of 40-kVA, rating o
Read more

Thermodynamics (Compressible Flow)

1. All real fluids are (a) incompressible (b) compressible to some extent (c) compressible to any extent (d) none of the above. 2. A change in the state of a system at constant volume is called (a) isobaric process (b) isochoric process (c) isothermal process (d) adiabatic process. 3. A process during which no heat is transferred to or from the gas is called an (a) isochoric process (b) isobaric process (c) adiabatic process (d) isothermal process. 4. The sonic velocity is largest in which of the following ? (a) Water (b) Steel (c) Kerosene (d) Air. 5. An isentropic flow is one which is (a) isothermal (b) adiabatic (c) adiabatic and irreversible (d) adiabatic and reversible. 6. Indica upto what Mach number can a fluid flow be considered incompressible ? (a) 0.1 (b) 0.3 (c) 0.8 (d) 1.0. 7. Which of the following is the basic equation of compressible fluid flow ? (a) Continuity equation (b) Momentum equation (c) Energy equation (d) Equation of st
Read more

Electrical Machines (Special Machines)

1. A single-stack, 4-phase, 6-pole VR stepper motor will have a step angle of (a) 15º (b) 30º (c) 45º (d) 90º 2. In a three-stack 12/8-pole VR motor, the rotor pole pitch is (a) 15º (b) 30º (c) 45º (d) 60º 3. A three-stack VR stepper motor has a step angle of 10º. What is the number of rotor teeth in each stack ? (a) 36 (b) 24 (c) 18 (d) 12 4. If a hybrid stepper motor has a rotor pitch of 36º and a step angle of 9º, the number of its phases must be (a) 4 (b) 2 (c) 3 (d) 6 5. What is the step angle of a permanent-magnet stepper motor having 8 stator poles and 4 rotor poles ? (a) 60º (b) 45º (c) 30º (d) 15º 6. A stepping motor is a .................. device. (a) mechanical (b) electrical (c) analogue (d) incremental 7. Operation of stepping motors at high speeds is referred to as (a) fast forward (b) slewing (c) inching (d) jogging 8. Which of the following phase switching sequence represents half-step operation of a VR stepper motor ? (a) A
Read more