Junior Engineer Electronics Question Paper

Some of my reader asked me to provide modal paper related to electronics engineering. so i collect some importance questions related to electronics engg. that asked in DMRC , BHEL , RRB UPPCL.

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Books for Junior Engineer (Electronics) Exam Preparation

Prevoius year Question Papers of electronics

Paper 1

paper 2

The boundary between p-type material and n-type material is called

A. a diode. B. a reverse-biased diode. C. a pn junction. D. a forward-biased diode.

An n-type semiconductor material

A. is intrinsic. B. has trivalent impurity atoms added. C. has pentavalent impurity atoms added. D. requires no doping.

An ideal diode presents a(n) ________ when reversed-biased and a(n) ________ when forward-biased.

A. open, short B. short, open C. open, open D. short, short

What types of impurity atoms are added to increase the number of conduction-band electrons in intrinsic silicon?

A. bivalent B. octavalent C. pentavalent D. trivalent E. none of the above

There is a small amount of current across the barrier of a reverse-biased diode. This current is called

A. forward-bias current. B. reverse breakdown current. C. conventional current. D. reverse leakage current.

VSB modulation is preferred in TV because

A. it reduces the bandwidth requirement to half B. it avoids phase distortion at low frequencies C. it results in better reception D. none of the above

In colour TV receiver, varactor diode is used for

A. detection B. rectification C. tuning D. both (a) and (b)

A 400 W carrier is amplitude modulated with m = 0.75. The total power in AM is

A. 400 W B. 512 W C. 588 W D. 650 W

In radar systems PRF stands for

A. Power Return Factor B. Pulse Return Factor C. Pulse Repetition Frequency D. Pulse Response Factor

Which of the following is the indirect way of FM generation?

A. Reactance bipolar transistor modulator B. Armstrong modulator C. Varactor diode modulator D. Reactance FM modulator

As the frequency increases, the absorption of ground wave by earth's surface

A. decreases B. increases C. remains the same D. either (a) or (c)

The velocity of sound waves in air

A. is constant at all temperatures B. varies directly as temperature C. varies inversely as absolute temperature D. varies directly as square root of absolute temperature

The range of a cordless telephone is about

A. 1000 m B. 500 m C. 100 m D. 10 m

The rate at which information can be carried through a communication channel depends on

A. carrier frequency B. bandwidth C. transmission loss D. transmitted power

A carrier is simultaneously modulated by two sine waves having modulation indices of 0.4 and 0.3. The total modulation index will be

A. 0.1 B. 0.7 C. 0.5 D. 0.35