ISRO Satellite Centre Bengaluru Electro-Mechanic Paper 2017

ISC Technician B Electro-Mechanic Paper 2017
Exam Date – 20th Aug 2017
Total Number of Questions – 60 Nos. Time- 90 Minutes

Impedance of an ideal parallel resonance circuit is
(a) infinite
(b) Zero
(c) 1K Ohms
(d) None of the above

If a battery has a capacity of 1000mAH, then which of the following is true
(a) It can source 1 A of current for one hour
(b) It can source 0.5 A of current for two hour
(c) It can source 2A of current for half an hour
(d) All of the above

An inverter module in a power supply converts
(a) AC to DC
(b) DC to AC
(c) AC to Ac
(d) DC to DC

Convert the following number 111111110111110111 from binary to hexadecimal
(a) FDF10
(b) 3FDF7
(c) FFE31
(d) 1FED2

ELCBs are mainly used in circuits for
(a) Protection against under voltage
(b) Protection against over voltage
(c) Protection against current leakage
(d) Protection against short circuit

Rating of a transformer is given in
(a) KV
(b) KA
(c) KW
(d) KVA

If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a LOW output?
(a) 1
(b) 2
(c) 7
(d) 8

In a step down transformer primary turns (N1) and secondary turns (N2) are related by
(a) N1>N2
(b) N1<N2
(c) N1=N2
(d) None of the above

Electrolyte used in lead acid battery is
(a) Potassium Hydroxide
(b) Dilute Sulphuric Acid
(c) Hydrochloric Acid
(d) Alkaline solution

If time period of a sine wave is 0.5 milliseconds then its frequency is
(a) 20 Hz
(b) 200 Hz
(c) 20000 Hz
(d) 2000 Hz

A Microsoft Windows is ____
(a) Operting System
(b) Graphic program
(c) Word Processing
(d) Database program

Number of 2 x 1 Multiplexers are required to implement 64 x 1 Multiplexers
(a) 60
(b) 61
(c) 62
(d) 63