# A circular radiation pattern is obtained using...

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A circular radiation pattern is obtained using

A) Travelling wave antenna (TWA) B) Rhombic antenna C) Yagi antenna D) Turnstile antenna

## Related questions

Why is the radiation pattern indicated on a polar graph ? (A) Easy to indicate the bandwidth (B) Easy to get the parameters of the antenna (C) Easy to understand the directionality of the antenna (D) Easy to find impedance

A half wavelength Dipole antenna has _________ Radiation Pattern  a. Hemispherical b. Omni-Directional c. Isotropic d. End fire

Lissajous pattern obtained on a CRO screen is a circle. Frequency of two signals are   (a) Equal (b) Unequal (c) Zero (d) Infinity

Gauge factor of about 5 can be obtained using strain gauge made of  A) Constantan B) Ferry C) Nichrome V D) Platinum

In a circular waveguide the dominant mode is:  (1) TE01 (2) TE11 (3) TE20 (4) TE21

How does the resistance of a circular conductor behave, if the diameter of the conductor is halved?  A) Remains unchanged B) Doubles C) Becomes 4 times D) Becomes one -fourth

Which of the following permutation can be obtained in the output (in the same order) using a stack assuming that the input is the sequence 1, 2, 3, 4, 5 in that order?  (1) 3, 4, 5, 1, 2 (2) 3, 4, 5, 2, 1 (3) 1, 5, 2, 3, 4 (4) 5, 4, 3, 1, 2

The phase angle corresponding to λ/4 in a standing– wave pattern is: (1) 30° (2) 90° (3) 135° (4) 180°

By which of the following connections, one-bit binary counter can be obtained from a JK flip-flop?  A) J = K = 0 B) J = K = 1 C) J = K’ D) None of these

In a strain measuring device, using a strain gauge, the output quantity is  A) Voltage B) resistance C) Impedance D) either A) or B)

Timing resistor of a monostable using 555 is 100 kOhm. The timing capacitance (in nF) required for pulsewidth of 100mS is about  A) 100 B) 300 C) 600 D) 900

The amount of solar radiation received on a unit area exposed perpendicular to sunlight is termed as : (A) Solar insulation (B) Solar constant (C) Solar radiance (D) Solar insolation

The Lissajous pattern observed on screen of CRO is a straight line inclined at 45° to x axis. If X–plate input is 2 sin ωt, the Y–plate input is (1) 2 sin ωt (2) 2 sin (ωt + 45°) (3) 2 sin (ωt – 45°) (4) 22 sin ωt + 45°)

The Lissajous pattern on the screen of a CRO is an ellipse with major axis in quadrant 2 and quadrant 4. Then the phase difference between two signals Can be :  (A) 270° (B) 210° (C) 180° (D) 300°

Consider the following statements with regard to Lissajous pattern on a CRO :  1. It is a stationary pattern on the CRO.  2. It is used for precise measurement of frequency of a voltage signal.  3. The ratio between frequencies of vertical and longitudinal voltage signals should be an integer to have a steady Lissajous pattern.  Which of the above statements is/are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is: (1) 30 V (2) 60 V (3) 15 V (4) 10 V

A 1ms pulse can be stretched to 1 s pulse by using (A) an astable multivibrator (B) a monostable multivibrator (C) a bistable multivibrator (D) a Schmitt trigger circuit

A 1 ms pulse can be converted into a 10 ms pulse by using  A) An astable mutivibrator B) A monostable multivibrator C) Bistable multivibrator D) J-K flip flop.

For a symmetrical emitter coupled differential amplifier using transistors of current gain 100, constant current source of 2 mA and with Vcc=10 V, differential input resistance in kOhm is about  A) 2.5 B) 5 C) 10 D) 50

A reading of 120 is obtained when a standard inductor was connected in the circuit of a Q-meter and the variable capacitor is adjusted to a value of 300 pF. A lossless capacitor of unknown value Cx is then connected in parallel with the variable capacitor and the same reading was obtained when the variable capacitor is readjusted to a value of 200 pF. The value of Cx in pF is  A) 100 B) 200 C) 300 D) 500

"Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with?

Liquid flow rate is measured using (A) a pirani gauge (B) a pyrometer (C) an orifice plate (D) a bourdon tube

Typical bit rate in kbps for voice encoding using DM technique is  A) 32-48 B) 48-64 C) 64-128 D) 132-248

Maximum phase distortion is encountered when using the filter approximation  A) Elliptic B) Butterworth C) Chebyshev I D) Inverse Chebyshev

Speed of improvement of computation of 64 point DFT by using FFT compared to direct computation is about  A) 4 B) 8 C) 16 D) 20

In CRO, Lissajous pattern will be a straight line, if the two signals are of same frequency with a phase difference of (a) 0° (b) 180° (c) 360° (d) All of these

Dry etching refers to removal of material, typically a masked pattern of semiconductor material, by exposing material to a bombardment of ions which contain (a) Plasma of nitrogen, chlorine and boron trichloride (b) Plasma of sodium, chlorine and boron trichloride (c) Plasma of nitrogen, phosphorous and boron trichloride (d) Plasma of nitrogen, chlorine and boron trioxide

A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies. The frequency of the horizontal input is 1000 Hz. What is the frequency of the vertical input?  (A) 400 Hz (B) 5000 Hz (C) 4000 Hz (D) 2500 Hz

An industrial consumer hall a daily load pattern of 2000 KW, 0.8 lag for 12 Hra and 1000 kW UPF for 1J Hr. The load factor i= _____.

A compact microstrip antenna may be obtained by

A single-phase transformer has no-load loss of 64 W, as obtained from an open circuit test. When a short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV windings, he measured loss is 81 W. The transformer has maximum efficiency when operated at  (A) 50.0% of the rated current (B) 64.0% of the rated current (C) 80.0% of the rated current (D) 88.8% of the rated current

The external characteristic of a shunt generator can be obtained directly from its – characteristic   1. internal 2. open-circuit 3. load-saturation 4. Performance

In a static over-current relay, inverse time characteristics are obtained by   (a) A differentiating circuit (b) An integrating circuit (c) A transistor amplifier (d) A transistor switch

Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting:  (1) A capacitor across the mains (2) A capacitor in series with the machine (3) A capacitor is series with the auxiliary winding (4) Equal value capacitors in series with the main and the auxiliary windings

Define : i) Diffuse radiation ii) Beam radiation ii) Insolation iv) Solar constant

In order to generate electron-hole pairs, the maximum wavelength of radiation for Silicon (Band gap = 1.1 eV) is  (a) 1.88 μm (b) 1.68 μm (c) 1.13 μm (d) 1.54 μm

Define load equalisation for electric motors. Explain how it is obtained for electric motors.

If the reference bus is changed in two load flow runs with same system data and power obtained for reference bus taken as specified P and Q in the latter run, the system losses  A) Will be unchanged but complex bus voltages will change B) Will change but complex bus voltage remain unchanged C) As well as complex bus voltage will changed D) As well as complex bus voltage will be unchanged

For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when