Jkp Constable Telecommunication Telecommunication Mcqs Jkp Constable (1089 MCQs)

Question 1001 Discuss

Ask a Friend

The torque developed in a 3-phase induction motor is directly proportional to:

A

The square of the applied voltage

B

The applied voltage

C

The inverse of the applied voltage

D

The stator frequency

Answer & Explanation

Correct Option: A

Torque is proportional to the product of flux per pole and rotor current, both of which are proportional to the applied voltage (T is proportional to V^2).

Question 1002 Discuss

Ask a Friend

If the maximum amplitude of an AM wave is 15V and the minimum amplitude is 5V, what is the modulation index?

A

0.33

B

0.5

C

1.0

D

2.0

Answer & Explanation

Correct Option: B

Modulation index m = (Vmax - Vmin) / (Vmax + Vmin) = (15 - 5) / (15 + 5) = 10 / 20 = 0.5.

Question 1003 Discuss

Ask a Friend

In a database structure, what prevents users from viewing sensitive columns or rows of a master table?

A

Triggers

B

Stored Procedures

C

Views

D

Foreign Keys

Answer & Explanation

Correct Option: C

A View is a virtual table representing the result of a database query. It acts as a security mechanism by restricting access to underlying raw data.

Question 1004 Discuss

Ask a Friend

To maintain a steady output in a UPS despite brief momentary power interruptions, what specific component provides the immediate energy?

A

Rectifier

B

DC Battery bank

C

Static bypass switch

D

Filter capacitor

Answer & Explanation

Correct Option: B

The DC Battery bank stores electrical energy chemically and supplies it instantly to the inverter stage when the mains AC supply drops out.

Question 1005 Discuss

Ask a Friend

Which of the following multiplexing technologies is predominantly used in optical fiber communications to transmit multiple signals simultaneously?

A

OFDM

B

TDD

C

WDM

D

CDMA

Answer & Explanation

Correct Option: C

Wavelength Division Multiplexing (WDM) multiplexes multiple optical carrier signals onto a single optical fiber by utilizing different wavelengths (colors) of laser light.

Question 1006 Discuss

Ask a Friend

A coaxial cable's characteristic impedance depends primarily on:

A

The physical length of the cable

B

The ratio of the inner and outer conductor diameters and dielectric constant

C

The operating frequency alone

D

The applied signal voltage

Answer & Explanation

Correct Option: B

Z0 for a coax is determined by its geometry (outer radius divided by inner radius) and the permittivity (dielectric constant) of the insulating material.

Question 1007 Discuss

Ask a Friend

When comparing AM and FM, which modulation is fundamentally more resistant to impulse noise?

A

AM

B

FM

C

Both are equally resistant

D

Neither is resistant to impulse noise

Answer & Explanation

Correct Option: B

Impulse noise typically adds amplitude spikes to signals. FM receivers use limiters to clip these amplitude variations, ensuring superior noise immunity.

Question 1008 Discuss

Ask a Friend

A TV station's video signal requires a minimum transmission bandwidth of 5 MHz. Using standard DSB, the channel bandwidth needed would be 10 MHz. To save spectrum, what scheme is actually used?

A

QAM

B

FM

C

VSB

D

SSB-SC

Answer & Explanation

Correct Option: C

Vestigial Sideband (VSB) transmits one complete sideband and a small 'vestige' of the other, drastically reducing bandwidth compared to DSB without sacrificing low frequencies.

Question 1009 Discuss

Ask a Friend

In the Indian e-Governance initiative, what does 'SWAN' stand for?

A

State Wide Area Network

B

System Wireless Access Node

C

State Wireless Authority Network

D

Synchronized Wide Area Node

Answer & Explanation

Correct Option: A

SWAN (State Wide Area Network) connects block/district headquarters to state capitals, providing secure data, voice, and video connectivity for government functioning.

Question 1010 Discuss

Ask a Friend

Calculate the power consumed by a 200V DC circuit drawing a current of 5 Amperes.

A

100 W

B

500 W

C

1000 W

D

2000 W

Answer & Explanation

Correct Option: C

Power in a DC circuit is given by P = V * I. P = 200V * 5A = 1000 Watts.

jkp constable telecommunication

Topics

Browse Topics

Practice Questions

The torque developed in a 3-phase induction motor is directly proportional to:

Answer & Explanation

If the maximum amplitude of an AM wave is 15V and the minimum amplitude is 5V, what is the modulation index?

Answer & Explanation

In a database structure, what prevents users from viewing sensitive columns or rows of a master table?

Answer & Explanation

To maintain a steady output in a UPS despite brief momentary power interruptions, what specific component provides the immediate energy?

Answer & Explanation

Which of the following multiplexing technologies is predominantly used in optical fiber communications to transmit multiple signals simultaneously?

Answer & Explanation

A coaxial cable's characteristic impedance depends primarily on:

Answer & Explanation

When comparing AM and FM, which modulation is fundamentally more resistant to impulse noise?

Answer & Explanation

A TV station's video signal requires a minimum transmission bandwidth of 5 MHz. Using standard DSB, the channel bandwidth needed would be 10 MHz. To save spectrum, what scheme is actually used?

Answer & Explanation

In the Indian e-Governance initiative, what does 'SWAN' stand for?

Answer & Explanation

Calculate the power consumed by a 200V DC circuit drawing a current of 5 Amperes.

Answer & Explanation

jkp constable telecommunication

Topics

Browse Topics

Practice Questions

The torque developed in a 3-phase induction motor is directly proportional to:

Answer & Explanation

If the maximum amplitude of an AM wave is 15V and the minimum amplitude is 5V, what is the modulation index?

Answer & Explanation

In a database structure, what prevents users from viewing sensitive columns or rows of a master table?

Answer & Explanation

To maintain a steady output in a UPS despite brief momentary power interruptions, what specific component provides the immediate energy?

Answer & Explanation

Which of the following multiplexing technologies is predominantly used in optical fiber communications to transmit multiple signals simultaneously?

Answer & Explanation

A coaxial cable's characteristic impedance depends primarily on:

Answer & Explanation

When comparing AM and FM, which modulation is fundamentally more resistant to impulse noise?

Answer & Explanation

A TV station's video signal requires a minimum transmission bandwidth of 5 MHz. Using standard DSB, the channel bandwidth needed would be 10 MHz. To save spectrum, what scheme is actually used?

Answer & Explanation

In the Indian e-Governance initiative, what does 'SWAN' stand for?

Answer & Explanation

Calculate the power consumed by a 200V DC circuit drawing a current of 5 Amperes.

Answer & Explanation

Report Issue

🎯 Master Your Exams

Subject-Wise Quizzes

Previous Year Questions