Bsnl Preparation Page 4

Ques-A sinusoidal oscillation from an amplifier requires:

(A) loop gain equal to unity

(B) phase shift around loop equal to 0 degrees

(C) both a and b, but at just one frequency

(D) none of the above

Ans C

Ques-The ICregulator that can be used as switching regulator is

(A) IC722

(B) IC7805

(C) LM317

(D) none

5. Digital Techniques : Applications and advantages of digital systems, number system (binary and hexadecimal) Logic Gates; Logic Simplication, Codes and Parity, Arithmetic circuits, Decoders, Display Devices and Associated Circuits,Multiplexers and De- multiplexers, Latches and Flip Flops, Counters, Shift Registers, Memories, A/D and D/A converters.
Sample Questions
Ques-A single transistor can be used to build which of the following digital logic gates?
(A). AND gates
(B). OR gates
(C). NOT gates
(D). NAND gates

Ques-Which of the following is Universal flip-flop
(A) JK flip-flop
(B) RS flip-flop
(C) Master slave flip-flop
(D) D flip-flop.

Ques-An add/drop multiplexer is a ______ device.
(A) one-layer
(B) two-layer
(C) three-layer
(D) four-layer

Useful Books for Exam Preparation We recommend you to purchase these books for your preparation besides these sample questions as these sample questions won't be enough to qualify these exams.
These are some of the best books we found
  

SPECIALIZATION – 90 MARKS
1. Electrical : 3 phases vs. single – phase supply, star Delta connections, relation between phase & line voltage power factor and their measurements, construction and principles of working of various types of electrical measuring instruments . All types of motor andgenerator- AC &DC transformers starters, rectifiers, inverters, battery charges,batteries, servo and stepper motors, contactor control circuits, switch gear, relays,protection devices & schemes, substation, protective relaying, circuits breaker,generator protection, transformer protection, feeder & lightening protection, feeder & bus bar protection, lightning arrestor, earthing, voltage stabilizer & regulators, power control devices & circuits, phase controlled rectifiers, inverters, choppers dual converters, cycloconverters, power electronics application in control of drivers, refrigeration & air – conditioning .


Sample Questions

Ques-The positive sequence reactance will be equal to negative sequence if the equipment is -
(A) Transformer & transmission lines
(B) generator
(C) motor
(D) none of these

Ques-A rectifier is a
(A) Bilateral device
(B) Linear device
(C) Non-linear device
(D) Passive device.

Ques-As the force on contact is increased, the contact resistance will
(A) increase linearly
(B) increase exponentially
(C) remain unaltered
(D) decrease.

Ques-Earthing conductivity is affected by:
(Q) Moisture content in the soil
(B) Chemical composition
(C) Concentration of salts in the soil
(D) All the above

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