Company: Bharat Sanchar Nigam Ltd

Maxwell?s loop current method of solving electrical networks ?
a) uses branch currents
b) utilizes kirchhoff?s voltage law
c) is confined to single-loop circuits
d) is a network reduction method

A transmission line of characteristic impedance Z0 = 50 ohms, phase velocity Vp = 2 x 108 m/s and length l = 1m is terminated by a load ZL= ( 30 ? j 40 ) ohms. The input impedance of the line for a frequency of 100 MHz will be
a)(30 + j40 ) ohms
b)( 30 ? j40 ) ohms
c)(50 + j40 ) ohms
d)(50 ? j40 ) ohms

For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle then the reflected wave will be-
a) Elliptically polarized
b) Linearly polarized
c) Right circularly polarized
d) Left circularly polarized

A yagi antenna has a driven antenna-
a) Only
b) With a reflector
c) With one or more directors
d) With a reflector and one or more directors

The number of lobes on each side of a 3l resonant antenna is ?
a) 3
b) 6
c) 2
d) 1

The electric field intensity of a Hertizian dipole at a remote point varies as –
Radiation resistance of a half wave folded dipole is –
a) 72 W
b) 144W
c) 288 W
d) 216W

When a carrier wave is modulated at 100% it?s power is increased by –
a)100%
b)150 %
c)50%
d)0%

On a clear sky day, the atmospheric radio noise is strongest –
a) During morning hours
b) Around mid-day
c) During nights
d) In the afternoon

TV broadcasting system in India is as per CCIR –
a) System B
b) System I
c) System M
d) System X

For the safety measurement of the internal resistance of a 25-0-25 mA meter, a laboratory multimeter whose sensitivity is equal to ?
a) 1k ohm/volt can be used
b) 10 k ohm/volt can be used
c) 100 k ohm/volt can be used
d) 200 k ohm/volt can be used

In order to measure moisture in wood the most suitable method is ?
a) Electrical conduction
b) Electrical ? capacitive
c) Absorption of radiation
d) Equilirium- moisture vs humidity

The flow rate of electrically conducting liquid without any suspended particle cannot be measured by ?
a) turbine flow meters
b) electromagnetic flow meters
c) ultrasonic flow meters
d) thermistor based heat loss flow meters

The most useful transducer for displacement sensing with excellent sensitivity, linearity and resolution is ?
a) an incremental encoder
b) an abosolute encoder
c) LVDT
d) a strain gauge

When variable reluctance type tachometer has 150 teeth on the rotor & the counter records 13,500 pulses per second then the rotational speed will be?
a) 4800 rpm
b) 5400 rpm
c) 6000 rpm
d) 7200 rpm.

41. On a voltage scale, zero dB m in a 600-ohm system could refer to ?
a) 1.732 V
b) 1.0 V
c) 0.7746 V
d) 0.5V

One of the following devices which is required in addition in order to measure pressure using LVDT is-
a) strain gauge
b) pitot tube
c) Bourden tube
d) Rotameter

It is required to measure temperature in the range of 13000 C to 15000 c) The most suitable thermocouple to be used as a transducer would be ?
a) chromel – constantan
b) Iron – constantan
c) chromel – alumel
d) platinum- rhodium

In a CSI if frequency of output voltage is f Hz, then frequency of input voltage to CSI is-
a) f
b) 2 f
c) f/2
d) 3 f

Identify the type of chipper in the given circuit

a) Type A chopper
b) Type B chopper
c) Type C chopper
d) Type D chopper