Nepal Engineering Council Registration Exam Farm Power Sources: practice questions

Question 1 · easy

The pull a trained draught animal can sustain for several hours is commonly taken as about what fraction of its body weight?

1. About 30–40%
2. About 10–14%
3. About 1–2%
4. About 50–60%

Question 2 · easy

Which harness lets a horse exert its full pull without pressing on its windpipe?

1. A neck yoke resting in front of the hump
2. A collar bearing on the shoulders
3. A horn (head) yoke
4. A nose rope

Question 3 · hard

A development project finds that bullocks in a district work fewer days than expected and many have neck sores. Which intervention addresses the most likely cause directly?

1. Replace hard narrow yokes with broad, smooth, padded yokes fitted to the animals
2. Buy heavier ploughs so that each pass does more work and fewer days are needed
3. Increase the working day to eight hours so that the lost working days are made up
4. Replace bullocks with buffaloes for summer work

Question 4 · easy

A power tiller is best described as:

1. A four-wheel tractor above 50 kW with a three-point linkage and PTO
2. A stationary engine driving a thresher
3. A tracked crawler usually used for land clearing and heavy earthmoving
4. A single-axle walking tractor

Question 5 · medium

A diesel pump set that delivered its rated output on the plains is installed at a high-altitude farm and gives noticeably less power. The main reason is:

1. Diesel has a lower calorific value when burned at high altitude
2. Water boils at a lower temperature so cooling fails
3. Thinner air admits less oxygen per cycle
4. Lower atmospheric pressure raises compression ratio

Question 6 · easy

A farm meter records 250 kWh. What is this energy in megajoules?

1. 69.4 MJ
2. 900 MJ
3. 250 MJ
4. 900,000 MJ

Question 7 · easy

The solar constant, the mean solar irradiance on a surface normal to the sun's rays at the top of the atmosphere, is about:

1. 1,000 W/m²
2. 136 W/m²
3. 13,670 W/m²
4. 1,361–1,367 W/m²

Question 8 · easy

Compared with open sun drying, a well-designed solar cabinet dryer mainly:

1. Works equally well at night without storage
2. Needs no ventilation because the moisture driven off stays inside and is reabsorbed
3. Protects the crop from dust, insects and rain and dries it faster at higher temperature
4. Uses concentrating mirrors to reach over 300 °C, drying the crop in a matter of minutes

Question 9 · medium

A 12 V, 150 Ah battery in a solar farm-lighting system may be discharged only to 50% depth of discharge. How much energy is usable?

1. 0.90 kWh
2. 1.80 kWh
3. 0.075 kWh
4. 900 kWh

Question 10 · medium

Most family-size biogas digesters operate in which temperature range, and what happens in winter?

1. Mesophilic, about 30–40 °C; gas production falls sharply in cold weather
2. Thermophilic, about 50–60 °C; gas production rises in winter
3. Psychrophilic, below 10 °C; gas production is unaffected by the changing season
4. Any temperature; methane bacteria are insensitive to temperature