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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 5951. |
Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful. |
| A. | INSAT-IA |
| B. | INSAT-IB |
| C. | INSAT-IC |
| D. | INSAT-ID |
| Answer» C. INSAT-IC | |
| 5952. |
At present, the radio-frequency band mainly used by most satellites is |
| A. | EHF |
| B. | UHF |
| C. | VHF |
| D. | SHF |
| Answer» E. | |
| 5953. |
In a stop-and-wait ARQ system, the transmitting terminal |
| A. | waits for positive or negative acknowled-gement from the receiving terminal after sending a block |
| B. | sends another block if positive acknowledge is received through ACK character |
| C. | resends the previous block if negative acknowledgement is received through a NAK character |
| D. | does not wait for acknowledgement after sending a block |
| Answer» E. | |
| 5954. |
While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced by half. To offer the same EIRP over the increased coverage area, the RF output power has to be increases by a factor of |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» C. 8 | |
| 5955. |
A communication satellite is a repeater between |
| A. | a transmitting station and a receiving station |
| B. | a transmitting station and many receiving station |
| C. | many transmitting station and many receiving station |
| D. | none |
| Answer» D. none | |
| 5956. |
Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr. |
| A. | 28000 |
| B. | 15000 |
| C. | 36000 |
| D. | 11100 |
| Answer» E. | |
| 5957. |
The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as |
| A. | Frequency Division Multiple Access (FDMA) |
| B. | Time Division Multiple Access (TDMA) |
| C. | Code Division Multiple Access (CDMA) |
| D. | All of the above |
| Answer» E. | |
| 5958. |
The first column of a Routh array isHow many roots of the corresponding characteristic equation are in left half s-plane? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 5959. |
In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz. |
| A. | 34 and 106 |
| B. | 52 and 88 |
| C. | 106 and 142 |
| D. | 34 and 142 |
| Answer» C. 106 and 142 | |
| 5960. |
In communication satellites, the up-link normally operates at a higher frequency than the down-link because it |
| A. | gives a narrow beam shining into space |
| B. | results in lesser signal attenuation |
| C. | gives better beam-shaping |
| D. | is easier to polarize a high frequency beam |
| Answer» B. results in lesser signal attenuation | |
| 5961. |
The ending part of the popular teleserial Mahabharat will be beamed to the viewers |
| A. | WESTAT |
| B. | INSAT-IC |
| C. | ARABSAT |
| D. | INSAT-ID |
| Answer» D. INSAT-ID | |
| 5962. |
To cover all inhabited regions of the Earth, the number of geosynchronous communication satellites required |
| A. | 5 |
| B. | 3 |
| C. | 10 |
| D. | 2 |
| Answer» C. 10 | |
| 5963. |
In Bode diagram (log magnitude plot) the factor (j )n in the transfer function gives a line having slope |
| A. | 20 dB/decade |
| B. | 20n dB/decade |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/18-111-3.png"> |
| D. | -20n dB/decade |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/18-111-3.png"> | |
| 5964. |
The entries in the first column of Routh array of a 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 |
| Answer» C. 3 | |
| 5965. |
The magnitude of transport lag factor is always zero. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5966. |
Point out the false statement.Launching of geostationary experimental communication satellite has helped India to gain experience in |
| A. | Building, for the time, a body-stabilized geosynchronous communication satellite with its own apogee propulsion and control systems |
| B. | Attitude control and station management operations for a geostationary satellite |
| C. | Building launching rocket Ariane for putting APPLE in orbit |
| D. | Domestic communications on an experimental basis |
| Answer» D. Domestic communications on an experimental basis | |
| 5967. |
A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond. |
| A. | 100 |
| B. | 270 |
| C. | 470 |
| D. | 540 |
| Answer» E. | |
| 5968. |
The degradation of satellite solar cells with time is mainly due to |
| A. | their bombardment by electrons |
| B. | collection of meteoric dust |
| C. | increase in resistivity of silicon |
| D. | gradual leakage of charge carriers from the semiconductor material |
| Answer» B. collection of meteoric dust | |
| 5969. |
The echo heard by a telephone user on a satellite channel can be removed by using |
| A. | a vocoder |
| B. | a multiplexer |
| C. | echo suppressor |
| D. | digital techniques |
| Answer» D. digital techniques | |
| 5970. |
Master control facility (MCF) for INSAT-2 series satellites is located at |
| A. | Madras |
| B. | New Delhi |
| C. | Leh |
| D. | Hassan |
| Answer» E. | |
| 5971. |
Consider Pole zero diagram as shown, If two Poles are moved in opposite direction towards = p/2 and -p/2, the filter will be |
| A. | change to high pass filter |
| B. | change to Band Pass filter |
| C. | remains same |
| D. | change to LPF |
| Answer» D. change to LPF | |
| 5972. |
A function having frequency f is to be sampled. The sampling time T should be |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-213-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-213-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-213-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-213-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-213-4.png"> | |
| 5973. |
Match the following: List I (Digital circuit) List II (Circuit type) A.BCD to 7 segment decoder1.sequential circuitB.4-to-1 MUX2.combinational circuitC.4 bit shift register3.neither sequential nor combinational circuit |
| A. | A-2, B-1, C-2, D-1 |
| B. | A-3, B-2, C-1, D-3 |
| C. | A-2, B-2, C-1, D-1 |
| D. | A-3, B-1, C-2, D-3 |
| Answer» D. A-3, B-1, C-2, D-3 | |
| 5974. |
The characteristics of a non-linear resistance is i = kv4. If i becomes 100 times, v becomes |
| A. | about 100 times |
| B. | about 10 times |
| C. | about 3 times |
| D. | about twice |
| Answer» D. about twice | |
| 5975. |
The dynamic equalising circuit consists of a series combination of capacitor C and resistor RC across each thyristor. This resistance RC (along with parallel connected diode) |
| A. | limits charging current |
| B. | limits discharging current |
| C. | limits both charging and discharging currents |
| D. | none of the above |
| Answer» C. limits both charging and discharging currents | |
| 5976. |
For a BJT a = 0.98, then = |
| A. | 0.02 |
| B. | 0.5 |
| C. | 4.9 |
| D. | 49 |
| Answer» E. | |
| 5977. |
The rated current of a thyristor is 40 A. The holding current will be about : |
| A. | 20 A |
| B. | 1 A |
| C. | 100 mA |
| D. | 10 mA |
| Answer» E. | |
| 5978. |
The law J = E, where J is current density, is electrical conductivity and E is field strength is |
| A. | Ohm's law |
| B. | Gauss law |
| C. | Ampere's law |
| D. | Biot-Savart law |
| Answer» B. Gauss law | |
| 5979. |
Assertion (A): Ferroelectric materials have spontaneous polarization.Reason (R): Above curie temperature, = for ferro-electric materials. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 5980. |
Material which lack permanent magnetic dipoles are known as |
| A. | paramagnetic |
| B. | diamagnetic |
| C. | ferromagnetic |
| D. | ferrimagnetic |
| Answer» C. ferromagnetic | |
| 5981. |
For the given figure, |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-299-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-299-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-299-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-299-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-299-3.png"> | |
| 5982. |
The maximum shift which can be provided by a lead compensator with transfer function is |
| A. | 15 |
| B. | 30 |
| C. | 45 |
| D. | 60 |
| Answer» C. 45 | |
| 5983. |
The polar plot of |
| A. | does not cross real axis |
| B. | crosses real axis |
| C. | crosses real axis at = 0.7 rad/sec |
| D. | crosses real axis at = 1.4 rad/sec |
| Answer» B. crosses real axis | |
| 5984. |
Assertion (A): For a given system only one of the static error constants is finite and significant.Reason (R): If finite static error constant is large, the loop gain becomes smaller as approaches zero. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» D. R is correct but A is wrong | |
| 5985. |
For the system of the given figure, the break away and break in points are determined from the conditions . Then K = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-88-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-88-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-88-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-88-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/16-88-3.png"> | |
| 5986. |
A lead compensator is basically a |
| A. | high pass filter |
| B. | low pass filter |
| C. | band stop filter |
| D. | none of the above |
| Answer» B. low pass filter | |
| 5987. |
If P is pressure difference, A is area of each flat surface, K is stiffness and x is displacement of movable surface from reference of bellows, then |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/31-327-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/31-327-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/31-327-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/31-327-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/31-327-4.png"> | |
| 5988. |
In a mechanical accelerometer, the steady state displacement is a measure of |
| A. | constant input acceleration |
| B. | constant input velocity |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. constant input velocity | |
| 5989. |
In a synchro transmitter |
| A. | input is angular position of rotor shaft and output is stator voltages |
| B. | input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft |
| C. | input is rotor voltage and output is angular position of rotor shaft |
| D. | input is angular position of rotor shaft and output is rotor voltage |
| Answer» B. input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft | |
| 5990. |
In a receiver, at higher frequencies |
| A. | tracking will be improved |
| B. | tracking will be poor |
| C. | selectivity will be poor |
| D. | image frequency rejection will be poor |
| Answer» B. tracking will be poor | |
| 5991. |
High IF in a superheat receiver |
| A. | improves selectivity |
| B. | increases tracking problems |
| C. | decreases tracking problems |
| D. | reduces adjacent channel rejection |
| Answer» C. decreases tracking problems | |
| 5992. |
FM receivers using the standard 88 to 108 MHz band use IF of |
| A. | 8 MHz |
| B. | 9.9 MHz |
| C. | 10.7 MHz |
| D. | 12.2 MHz |
| Answer» D. 12.2 MHz | |
| 5993. |
Most of the amplification of the received signal is obtained in a superheterodyne receiver from the |
| A. | IF stage |
| B. | RF stage |
| C. | power amplification stage |
| D. | none of the above |
| Answer» B. RF stage | |
| 5994. |
The problem associated with tuned-radio frequency receiver is |
| A. | instability |
| B. | insufficient adjacent frequency rejection |
| C. | bandwidth variation |
| D. | all of the above |
| Answer» E. | |
| 5995. |
The peak factor is |
| A. | rms value/peak value |
| B. | rms value/average value |
| C. | peak value/rms value |
| D. | peak to peak value/rms value |
| Answer» D. peak to peak value/rms value | |
| 5996. |
To plot frequency spectrum we draw two graphs viz |Fn| versus frequency and n versus frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5997. |
If f(t) is an even function, the coefficients Fn in the exponential form of Fourier series |
| A. | are real |
| B. | are imaginary |
| C. | are complex |
| D. | may be real or imaginary |
| Answer» B. are imaginary | |
| 5998. |
The minor Mij of an n x n matrix is the determinant of (n - 1) x (n - 1) matrix formed by deleting the ith row and j the column of n x n matrix. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5999. |
In Laplace transforms s = + j . Which of the following represents true natue of s. Select your answer using the given codes has a damping effect is responsible for convergence of integral f(t)e-st dt has a value less than zero Codes: |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» C. 2 and 3 | |
| 6000. |
The power in the signal s(t) = 8 cos (20 p - p/2) + 4 sin (15 pt) is |
| A. | 40 |
| B. | 41 |
| C. | 42 |
| D. | 82 |
| Answer» B. 41 | |