# RADAR is an acronym for:

41 views
RADAR is an acronym for: A) Radio Detection and Repulsion B) Radio Device and Ranging C) Radio Detection and Ranging D) Ranging Detection and Retrieve

## Related questions

A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz centred around 1 GHz. The range resolution capability of this radar is A) 7.5 m B) 7.5 Km C) 75 m D) 750 m

A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar? A) 5 Km B) 5 m C) 50 Km D) 15 m

A Doppler Radar operating at 15 GHz is viewing a target moving directly towards it at the speed of 25 m/s. The Doppler frequency shift

The IF BW of a radar receiver is inversely proportional to the (A) Pulse width (B) prf (C) Pulse interval (D) Square root of the peak transmitted frequency

. If the peak transmitted power in a radar system is increased by a factor of 16, the maximum range will be increased by a factor of : (A) 2 (B) 4 (C) 8 (D) 16

If the antenna diameter in a radar system is increased by a factor of 4, the maximum range will be increased by a factor of  (a) 2 (b) 4 (c) 8 (d) 16

For an RLC series AC circuit, the current at series resistance is (a) maximum at lagging power factor (b) maximum at leading power factor (c) maximum at unity power factor (d) minimum at unity power factor

In an induction motor high rotor resistance is required for (a) Power factor and low starting current (b) high power factor and high starting current (c) high power factor and low starting current (d) low slip and high efficiency

The voltage regulation for 0.95 lead pf is zero for an alternator. If so, the voltage regulation for 0.9 lead pf with all other conditions remaining same will be (A) Positive (B) Negative (C) Zero (D) Insufficient data

An electrodynamic wattmeter is not considered suitable for low power factor circuits because of (A) Inductance of voltage coil (B) Reactance of current coil (C) Power loss in voltage coil (D) Power loss in current coil

An alternator is connected to a bus. For a symmetrical fault at the bus, the fault level is 60 MVA. If another alternator is connected to the same bus, the new fault level will be (1) 120 MVA (2) 60 MVA (3) 30 MVA (4) 15 MVA

While selecting motor for an A.C which of the following characteristics is of great importance (1) Type of bearings (2) Type of enclosure (3) Noise (4) Arrangement for power transmission

For an SCR, dV/dt protection is achieved by the use of   (a) RL in series with SCR (b) L in series with SCR (c) RC in series with SCR (d) RC across SCR

An alternator is delivering rated current at rated voltage and 0.8 power-factor lagging. For delivering rated current at rated voltage and 0.8 poWer—factor leading, the required excitation will be:  (A) less  (B) more (C) more or less (D) the same

The most suitable motor for low power applications is a/an:  (A) dc series motor (B) dc shunt motor (C) ac two-phase induction motor (D) ac series motor

Which one among these is an example for trivalent impurity?  (A) Phosphorus (B) Antimony (C) Gallium (D) Arsenic

A system function has a pole at s=0 and a zero at s= -1. The constant multiplier is unity. For an excitation cos(t), What is the steady-state response?  (A) √2sin(t+450) (B) √2sin(t-450) (C) sin(t-450) (D) Sin(t)

For measuring the frequency of an unknown A.C. source. Which of the following device is necessary to obtain a standard waveform?  (A) Operational amplifier (B) Astable multivibrator (C) Schmitt trigger (D) Monostable multivibrator

Why starter is required for starting an induction motor?

In a radar system maximum unambiguous range depends on  (A) maximum power of the transmitter (B) pulse repetition frequency (C) width of the transmitted pulse (D) sensitivity of the radar receiver

For an insulating material, dielectric strength and dielectric loss should be respectively   (A) high and high (B) low and high (C) high and low (D) low and low.

The output clock frequency for a frequency division circuit having 11 flipflops with an input clock frequency of 20.48 MHz is : (A) 10.24 kHz (B) 5 kHz (C) 10 kHz (D) 5.12 kHz

The diameter of the rotor shaft for an electric motor depends on which of the following (1) rpm only (2) hp only (3) hp and rpm (4) hp, rpm and Power factor

For applications requiring speed ratio other than 2 : 1, the speed control of an induction motor can be effected by varying the number of stator poles employing  (1) multiple stator winding (2) pole amplitude modulation technique (3) consequent pole technique (4) Any of these

For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have   (a) short rise time with pulse width = 3 µsec (b) long rise time with pulse width = 6 µsec (c) short rise time with pulse width = 6 µsec (d) None of the above

What is another name for an insulator?

What is encoder? Draw and explain an optical encoder operation for rotary motion measurement.

KVA of an Auto-transformer of V1/V2 = 220/150 for a load of 100KVA is: a. 100KVA b. 50KVA c. 33.3KVA d. 20KVA

If the range of an analog transducer is 0 to 10 V, then for a resolution of 5 mV, the bits of ADC will be _____.

Number of comparators required for an 8 bit flash ADC is: (1) 8 (2) 16 (3) 255 (4) 256

A 4-pole, 3-phase, double-layer winding is housed in a 36-slot stator for an ac machine with 60o phase spread. Coil span is 7 short pitches. Number of slots in which top and bottom layers belong to different phases is  (A) 24 (B) 18 (C) 12 (D) 0

for the voltage built-up a self-excited D.C. generator, which of the following is not an essential condition.  1.there must be some residual flux  2.field winding mmf must aid the residual flux  3.total field circuit resistance must be less than t critical value  4.armature speed must be very high

An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

An induction type energy meter is found to run fast. Correction for this error can be made by  (A) Over-load compensation. (B) Voltage compensation. (C) Moving the brake magnet away from the centre of the disc. (D) Moving the brake magnet towards the centre of the disc.

The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is (A) 2/3 (B) 5/6 (C) 7/8 (D) 6/7

In an oil filled transformer, oil is provided for (A) cooling (B) insulation (C) lubrication (D) both (A) and (B)

Multiplicity is the same as what concept for an ERD?  (1) Relationship (2) Entity (3) Attribute (4) Cardinality