Mock Test on Diploma Electronics Engineering

1. Magnetic amplifier is used for amplification of
(a) Voltage
(b) Power
(c) Current
(d) frequency

2. In position control system the device, used for providing rate-feedback voltage is
(a) Potentiometer
(b) synchro-transmitter
(c) synchro- transformer
(d) tacho-generator

3. Which of the following is used to obtain output position in a position control system?
(a) strain gauge
(b) load cell
(c) synchro
(d) thermistor

4. An electro-mechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is
(a) synchro control transformer
(b) LVDT
(c) stepper motor
(d) tacho-generator

5. For stable network, the real parts of poles and zeros of driving point function must be
(a) negative
(b) zero or negative
(c) zero
(d) positive

6. The radius of constant N circle for N = 1 is
(a) √2
(b) 2
(c) 1
(d) 1/√2

7. The polar plot of a transfer function passes through ( – 1, 0 ) point. The gain margin is
(a) Zero
(b) – 1 dB
(c) 1 dB
(d) ∞

8. The force required to initiate motion between two contacting surfaces is called
(a) Coulomb force
(b) viscous force
(c) stiction
(d) none of these

9. Generally a servo motor operates at
(a) high torque and high speed
(b) low torque and low speed
(c) low torque and high speed
(d) high torque and low speed

10. The most commonly used devices for differencing and amplification, in control system are
(a) BJTs
(b) FETs
(c) op-Amp
(d) either (a) or (b)

11. In control system the output of sensor is usually
(a) analog electrical signal
(b) digital electric signal
(c) mechanical signal
(d) (a) or (b)

12. DC tacho-generator can be used in
(a) Speed control
(b) position control
(c) both (a) or (b)
(d) neither (a) nor (b)

13. The entries in the first column of Routh array of fourth order are 5, 2, – 0.1, 2, 1. The number of poles in the right half plane are
(a) 1
(b) 2
(c) 3
(d) 4

14. For the factor ( 1 + 0.5jw ) the corner frequency is
(a) 1 rad/sec
(b) 0.5 rad/sec
(c) 2 rad/sec
(d) 0.25 rad/sec

15. Robotic manipulator arms mostly use
(a) hydraulic actuator
(b) pneumatic actuator
(c) electric motor actuator
(d) none of these

16. DMA stands for
(a) direct memory access
(b) distributed memory address
(c) direct memory accumulator
(d) decimal machine address

17. In 8085 the pins for + 5V input and ground are
(a) 20 & 40
(b) 40 & 20
(c) 1 & 2
(d) 2 & 1 respectively

18. ALE stands for
(a) Address latch enable
(b) accumulator latch enter
(c) address latch enter
(d) accumulator latch enable

19. If 8085 processor is required to add two 32 bit numbers, the numbers of addition sequence is
(a) 1
(b) 2
(c) 4
(d) 8

20. In Intel 8085, the integer range per word length is
(a) – 128 to 127
(b) – 127 to 128
(c) – 64 to 63
(d) – 63 to 64

21. Which of the following schemes has unique representation of zero?
(a) Sign magnitude
(b) 1’s complement
(c) 2’s complement
(d) both (b) & (c)

22. The decimal equivalent of binary (1101.11) is
(a) 9.75
(b) 11.50
(c) 11.75
(d) 13.75

23. 6 bytes means
(a) 6 bits
(b) 24 bits
(c) 48 bits
(d) 96 bits

24. In 8085 stack pointer is
(a) 4 bit
(b) 8 bit
(c) 16 bit
(d) 32 bit

25. The 8085 instruction LDA 0FFAH is an example of
(a) direct addressing
(b) register addressing
(c) immediate addressing
(d) implicit addressing

More Question Set on Electronics Engineering Diploma MCQs from Various Exam

26. In 8085, which addressing mode is also called inherent addressing?
(a) Direct
(b) Register
(c) Implicit
(d) immediate

27. Length of an instruction of 8085 processor, using immediate addressing mode is
(a) 2 bytes
(b) 3 bytes
(c) 2 or 3 bytes
(d) 4 bytes

28. Which of the following directives in 8085 assembler causes 2 bytes to be reserved in the memory?
(a) DS
(b) DB
(c) DW
(d) EQU

29. Which of the following is not treated as hexadecimal constant by 8085 assembler?
(a) 234
(b) 64QH
(c) A?P0H
(d) all of above

30. To multiply a number by 8 in 8085 processor, we have to use RAL instruction
(a) Once
(b) Twice
(c) Thrice
(d) four times

31. Which instructions are useful for writing subroutines?
(a) CALL
(b) RET
(c) both (a) & (b)
(d) none of these

32. Which of the following memories is the fastest?
(a) Cache
(b) Primary
(c) Secondary
(d) backup

33. Most of the memory chips with static RAM need
(a) 2V supply
(b) 5V supply
(c) 12V supply
(d) none of above

34. The number of interrupt lines in 8085 processor is
(a) 2
(b)
(c) 3
(d) 4
(e) 5

35. Which of the following is not an interrupt line in 8085?
(a) RST5.5
(b) RST7.5
(c) RST9.5
(d) TRAP

36. In 8085 processor, the address space size is
(a) 64 Kbits
(b) 64 Kbytes
(c) 32 Kbits
(d) 32 Kbytes

37. 8255A is a
(a) PPI
(b) I/O device
(c) memory
(d) none of above

38. Which of the following is also called hand shaking programmed data transfer?
(a) synchronous data transfer
(b) asynchronous data transfer
(c) interrupt driven data transfer
(d) both (a) & (c)

39. The 8257 chip is a
(a) Programmable interrupt controller
(b) programmable peripheral interface
(c) Programmable DMA controller
(d) programmable interval Timer

40. Which of the following 8085 instruction does not belong to arithmetic group?
(a) SHLD
(b) SUI
(c) ADC
(d) INR

41. In which group of instructions condition flags are not affected?
(a) data transfer group
(b) arithmetic group
(c) logical group
(d) both (a) & (c)

42. The register set and instruction set of 8088 processor is similar to that of
(a) 8085
(b) 8086
(c) 8087
(d) none of these

43. Which of the following instructions have only one operand?
(a) Add
(b) Multiply
(c) Subtract
(d) shift

44. Which of the following identifiers is invalid in PASCAL?
(a) Beta
(b) MAX40
(c) 2.Nd
(d) A Max

45. Which of the following is not a valid real constant in C?
(a) 426
(b) 321.0
(c) – 627.431
(d) + 201.84

46. The maximum number of characters for variable name in C language is
(a) 4
(b) 8
(c) 12
(d) 16

47. What does the operator ( ) mean in C?
(a) function expression
(b) array expression
(c) structure operator
(d) increment/decrement

48. The statement !( b < 5 ) in C means
(a) B = 5
(b) b > 5
(c) b >= 5
(d) b <= 5

49. The number of storage classes in C is
(a) 2
(b) 3
(c) 4
(d) 6

50. Which of the following is not a library string function in C?
(a) strlen
(b) strcpy
(c) strdup
(d) strbig