HAL Model Question Paper for Management Trainee Electronics

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HAL Management Trainee Electronics Model Question Paper
If each stage had gain of 10dB and noise figure of 10dB, then the overall noise figure of two-stage cascade amplifier will be
a) 10 b) 1.09 c) 1.0 d) 10.9

A series RLC circuit resonates at 1000 kHz. At frequency of 995 kHz, the circuit impedance is
a) Resistive b) minimum c) Inductive d) capacitive

In Sigma delta ADC, high bit accuracy is achieved by
a) Over sampling and noise shaping b) Over sampling
c) Under sampling d) None of the above

A particular current is made up of two components: a 1O A dc and a sinusoidal current of peak value of 1.414 A. The average value of the resultant current is
a) Zero b) 24.14 A c) 10 A d) 14.14 A

By doubling the sampling frequency
a) Quantisation noise decreases by 3dB
b) Quantisation noise density decreases by 3dB
c) Quantisation noise increases by 3dB
d) Quantisation noise density increases by 3dB

A Pulse train with a frequency of 1MHz is counted using a modulo 1024 ripple-counter built with J-K flip-flops. for proper operation of the counter the maximum permissible propagation delay per flip-flop stage is
a) 100 n sec b) 50 n sec c) 20 n sec d) 10 n sec

The AID converter used in a digital voltmeter could be (1) successive approximation type (2) Flash converter type (3) Dual slope converter type. The correct sequence in the increasing order of their conversion times is
a) 1,2,3 b) 2,1,3 c) 3,2,1 d) 3,1,2

In a microprocessor, the resister which holds the address of the next Instruction to be fetched is
a) Accumulator b) Program Counter
c) Stack pointer d) instructor register