VSSC Electrician Previous Paper | Vikram Sarabhai Space Centre Electrician Paper 2017

VSSC Technician Exam 2023 will be conducted on 20th Aug 2023 for the post Electrician. If you are the  aspirants of the said exam, then you must read this question paper for your practice.

PIV of a diode indicates
(a) Peak instantaneous voltage
(b) Peak inverse voltage
(c) Peak inverse value
(d) PIV do not apply to diodes

Which is the configuration of opto-coupler and its typical use?
(a) LED and a phto diode, used for isolation
(b) LED and a signal diode, used for signal clamping
(c) Transistor and LED, used for voltage amplification
(d) Photo diode and Transistor, used for attenuation

hfe of a transistor increases if
(a) Base width is increased
(b) Doping of base is reduced
(c) Power rating of the transistor is increased
(d) Metal can packaging is used

XOR gate
(a) Can be used to know whether two digital inputs are indentical
(b) Is a NOT followed by OR
(c) Two OR gates followed by AND
(d) Cannot be used for matching of two inputs

The following Hexadecimal operation yields : 0xF0-0xAA+0x10_______
(a) 0xA5
(b) 0x56
(c) 0x74
(d) 0x66

A binary counter to count upto 100 (decimal) needs at least
(a) 7 flipflops
(b) 6 flipflops and one OR gate
(c) 5 flipflops and two AND gates
(d) 50 flipflops

What is the resistance during heating of the thermostat in a water heater?
(a) Around 1 kilo Ohms
(b) Close to zero Ohms
(c) Very high value upto 100 Ohms
(d) Open

The capacitor in an electric fan is connected as
(a) Series to start winding
(b) Series to main winding
(c) Parallel to main winding
(d) Parallel to start winding

Which pump does not need priming?
(a) Reciprocating Pump
(b) Jet pump
(c) Submersible Pump
(d) Centrifugal Pump

AC voltage of the order of 110 kV is typically used for long distance transmission mainly because
(a) Thinner conductors are only required
(b) Chance of Corona is less
(c) Generators produce 110 KV AC
(d) Some customers may need 110 KV AC supply
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