VSSC Electronic Mechanic Paper 2016

Vikram Sarabhai Space Center Electronic Mechanic Paper 2016

If the bandwidth of a band-pass filter increases
(a) Q decreases
(b) the roll-off rate increases
(c) the half-power frequency decreases
(d) the center frequency decreases

You could increase the time constant of an RC circuit by
(a) adding a resistor in parallel with the circuit resistance
(b) adding a capacitor in parallel with the circuit capacitance
(c) increasing the amplitude of the input voltage
(d) exchanging the position of the resistor and capacitor in the circuit

What is the voltage across a capacitor after being charged from a 10 V DC source for a period of one time constant
(a) 10 V
(b) 3.7 V
(c) 6.4 V
(d) 1 V

Which of the following conditions are needed to properly bias an NPN transistor amplifier?
(a) Forward bias the base-emitter junction and reverse bias the base-collector junction
(b) Foward bias the collector-base junction and reverse bias the emitter-base junction
(c) Apply a positive voltage on the n-type material and a negative voltage on the p-type material
(d) Apply a large voltage on the base

If the input to a comparator is a sine wave, the output is a
(a) ramp voltage
(b) sine wave
(c) rectangular wave
(d) saw tooth wave

In a c-E configuration, an emitter resistor is used for
(a) Bias stabilization
(b) ac signal bypass
(c) colletor bias
(d) higher gain

The number of bits used to store a BCD digit is
(a) 8
(b) 4
(c) 1
(d) 2

What is the decimal value for the binary number 1001.0010?
(a) 125
(b) 12.5
(c) 90.125
(d) 9.125

A single transistor can be used to build which of the following digital logic gate?
(a) AND gate
(b) NOT gate
(c) OR gate
(d) NAND gate

What is the standard TTL noise margin?
(a) 1.0 V
(b) 0.2 V
(c) 0.8 V
(d) 0.4 V