33.

34.

35.

36.

87.

38.

39.

Calculate the modulation depth, when a transmitter radiates a signal of 10.125 kW after
modulation and 9kW without modulation of the signal :

(A) 80% ®) 67%

(C) 50% (೧) 100%
If the number of quantisation levels in a PCM (Pulse Code Modulation) system is increased
from 8 to 64, the bandwidth of the channel changes by :

(A) a factor of 8 (B) a factor of 4

(C) a factor of 2 (D) a factor of %

Which of the following statement is incorrect about satellite communications?

(A) A communication satellite is repeater between many transmitting stations and
many receiving stations

(B) Uplink frequency is higher than downlink frequency

(C) The Global Positioning System uses ‘one way communication’ from satellite to
users, so that user does not require a transmitter

(D) None of these

Which of the following is Register Indirect Addressing?
(A) MVIA,05 H (B) MOVA,B
(C) MOVA,M (D) LDA 2500H
A microprocessor acts as a central processing unit for a microcomputer. Which of the
following can be part/parts of such a microprocessor?
(^) Registers (B) RAM
(C) Peripheral Devices (D) All the above
8085 microprocessor has 5 MHz frequency. An instruction cycle consists of an Opcode Fetch

and Memory Read which requires 4T states and 3T states to execute. The time required to
execute the instruction cycle is :

(A) 35 us (8) 0.7 us
( 14 us ൯൬) 7 ‏5م‎

The frequency of the crystal oscillator in the 8051 microcontroller is 12 MHz. The time
required for one machine cycle is :

1
(A) 12 us (8) pHs

(0 1/5 ൩൬) 608

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