Knowledge Booster: S & T Signal Edition (05 Mar 2026)
Welcome to today's S & T Signal Knowledge Booster! We've handpicked 10 essential questions from our database to help you sharpen your skills. Dive in and test your knowledge!
Q1. Class-C protection modules in power supply system for S&T equipments is provided for which of the following purpose? विज्ञान एवं प्रौद्योगिकी उपकरणों के लिए विद्युत आपूर्ति प्रणाली में क्लास-सी सुरक्षा मॉड्यूल निम्नलिखित में से किस उद्देश्य के लिए प्रदान किया जाता है?
- A) Power line protection at Distribution level
- B) Power line protection against low voltage surges at Equipment level connected between line and neutral.
- C) Protection against Lightening & transients at various stages of input (AC) & output (AC/DC)
- D) Protection against Direct Lightening & transients on the S&T system Building
Correct Answer: Power line protection against low voltage surges at Equipment level connected between line and neutral.
Explanation: Explanation : This is provided with an external lightning conductor on top of the building connected through a down conductor to ground (EARTH). This is known as class ‘A’ protection,By this arrangement 50% of lightning energy is connected to ground. • The first stage of protection provided before the equipment at mains distribution panel is called class ’B’ type.
Q2. In IRS 86-2000 chargers, the float voltage can be adjustable between आईआरएस 86-2000 चार्जर में, फ्लोट वोल्टेज को एडजस्ट किया जा सकता है।
- A) 2.2 V to 2.7 V per cell
- B) 2.12 to 2.3 V per cell
- C) 2.2 V per cell
- D) 2.4 V per cell
Correct Answer: 2.12 to 2.3 V per cell
Explanation: Explanation : 2.7 is initial charging 2.4 is Boost mode
Q3. The maximum excitation voltage applied to relays other than QBAT shall be _______________. ASTE 70% 2025. QBAT के अलावा अन्य रिले पर लागू अधिकतम उत्तेजना वोल्टेज _______________ होगा। ASTE 70% 2025.
- A) 250%
- B) 125%
- C) 300%
- D) 200%
Correct Answer: 300%
Explanation: Explanation : of its rated pick up voltage under minimum ballast resistance condition and (a) DC track relays of approved design shall be used. In future installations,
Q4. Two Packet Single Stage system of tendering shall be followed for Works Tenders valuing above which value :- दो पैकेट वाली एकल चरण निविदा प्रणाली उन निर्माण निविदाओं के लिए अपनाई जाएगी जिनका मूल्य इससे अधिक है:-
- A) Rs 1 Crore
- B) Rs5 Crores
- C) Rs 10 Crores
- D) Rs 25 Crores
Correct Answer: Rs 10 Crores
Explanation: Explanation : 70% ASTE 2024
Q5. As per IRSEM-2021, as a general arrangement, normally Air Conditioning may be provided for every signalling interlocking (PI/RRI) installation having more than "X" no. of signalling routes. What shall be the value of "X" amongst the followings? आईआरएसईएम-2021 के अनुसार, सामान्य व्यवस्था के तहत, "X" से अधिक सिग्नलिंग मार्गों वाले प्रत्येक सिग्नलिंग इंटरलॉकिंग (PI/RRI) इंस्टॉलेशन के लिए सामान्यतः एयर कंडीशनिंग की व्यवस्था की जा सकती है। निम्नलिखित में से "X" का मान क्या होगा?
- A) 50 Routes
- B) 100 Routes
- C) 200 Routes
- D) mandatorily, for all routes
Correct Answer: 100 Routes
Explanation: Explanation : 100 nos subject to certain conditions l.e Air-conditioning to be connected to local supply only, temperature to be maintained at 28°C - 30°C and to be operated only during day time
Q6. In a station provided with MSDAC, if any track section fails and its corresponding supervisory section is clear then ____. ASTE 70% 2025 एमएसडीएसी से सुसज्जित स्टेशन में, यदि कोई ट्रैक खंड विफल हो जाता है और उसका संबंधित पर्यवेक्षण खंड सुचारू है तो ____। ASTE 70% 2025
- A) the track section is treated as failed and manual reset applied
- B) the failed track section is automatically reset
- C) Supervisory section being clear is used to indicate to the Station Master that the track section is failed
- D) none of the options
Correct Answer: the failed track section is automatically reset
Explanation: Explanation : within the jurisdiction of that supervisory track section can be assumed to be clear. If any track section fails and it’s corresponding supervisory track section is clear, it will
Q7. Automatic signal shall not assume OFF aspect unless the line is clear upto a distance of ______ mtrs beyond the next stop signal in advance if the signal happens to be a manual stop signal or semi automatic stop signal. CBT ASTE 2025 70%. यदि अगला स्टॉप सिग्नल मैनुअल या सेमी-ऑटोमैटिक है, तो ऑटोमैटिक सिग्नल तब तक बंद नहीं होगा जब तक कि उससे पहले वाले स्टॉप सिग्नल से ______ मीटर की दूरी तक रास्ता साफ न हो। CBT ASTE 2025 70%.
- A) 120
- B) 100
- C) 180
- D) none of the options
Correct Answer: 180
Explanation: Explanation : 120 meters automatic
Q8. The wires connecting various equipments shall be of adequate size so as to ensure that the voltage loss is not more than ____________. CBT ASTE 2025 विभिन्न उपकरणों को जोड़ने वाले तारों का आकार पर्याप्त होना चाहिए ताकि वोल्टेज हानि ____________ से अधिक न हो। CBT ASTE 2025
- A) 1%
- B) 3%
- C) 0.50%
- D) none of the options
Correct Answer: 0.50%
Explanation: Explanation : voltage drop
Q9. Block earths resistance shall not exceed? ॉक एथ का प्रितरोध िकसस अिधक नही होना चािहए? ब्लॉक अर्थ का प्रतिरोध अधिक नहीं होगा? ठीक है एथ का विरोध इस्सास अधक नहीं होना चाहिए?
- A) 10 ohms 10 ओम(ohms)
- B) 1 ohm 1 ओम (ohm)
- C) 100 ohms 100 ओम (ohms)
- D) 1 kilo ohm 1 िकलो ओम (ohms)
Correct Answer: 10 ohms 10 ओम(ohms)
Explanation: Explanation : CBT 70% ASTE 2025
Q10. Sectional Route Release shall be provided at stations where the number of routes is more than____________. ASTE 70% 2025. जिन स्टेशनों पर मार्गों की संख्या ____________ से अधिक है, वहां खंडीय मार्ग छूट प्रदान की जाएगी। ASTE 70% 2025.
- A) 100
- B) 200
- C) 400
- D) none of the options
Correct Answer: 100
Explanation: Explanation :
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