1) In radiation mode of heat transfer, the heat is transferred from one body to other
a. From molecule to molecule due to the temperature gradient between two parts
b. By actual movement of the heated molecules
c. Without actually heating the medium in between
d. All of these
|
Answer
Explanation
Related Ques
|
ANSWER: Without actually heating the medium in between
Explanation:
No explanation is available for this question!
|
|
2) The sun’s rays reach the earth without heating the atmosphere, this is due to
a. Convection
b. Radiation
c. Conduction
d. None of these
|
3) Direct resistance heating method is used in
a. Salt bath furnaces
b. Resistance welding
c. Electrode boiler for heating water
d. All of these
|
4) In indirect core type of furnace, the element is heated by induction, which transfer the heat to the charge by
a. Conduction
b. Radiation
c. Convection
d. All of these
|
5) For improving the power factor of coreless type induction furnace,
a. Capacitor is used
b. Inductor is used
c. Resistor is used
d. Transistor is used
|
6) High frequency eddy current heating is used for
a. Melting of non-ferrous metals
b. High grade alloy steel production
c. Hardening the surfaces of materials being heated
d. Vacuum heating
|
Answer
Explanation
Related Ques
|
ANSWER: Hardening the surfaces of materials being heated
Explanation:
No explanation is available for this question!
|
|
7) The rate of heat produced by dielectric heating is increased by
a. Increasing frequency and voltage supply
b. Increasing frequency and decreasing voltage supply
c. Decreasing frequency and voltage supply
d. Decreasing frequency and increasing voltage supply
|
8) The metal which can be extracted from its ore by the method of electrolysis is /are
a. Zinc
b. Aluminium
c. Copper
d. All of these
|
9) The energy required for refining of gold in kWh / tone is about
a. 100 to 150
b. 250 to 350
c. 300 to 350
d. 350 to 400
|
10) Throwing power is the ability of the electrolyte to produce
a. Uniform deposit on an article of regular shape
b. Uniform deposit on an article of irregular shape
c. Non - uniform deposit on an article of regular shape
d. Non - uniform deposit on an article of irregular shape
|
Answer
Explanation
Related Ques
|
ANSWER: Uniform deposit on an article of irregular shape
Explanation:
No explanation is available for this question!
|
|
11) Reduction factor of a source of light is the ratio of its
a. Mean horizontal candle power to the mean spherical candle power
b. Mean spherical candle power to the mean horizontal candle power
c. Maximum horizontal candle power to the mean spherical candle power
d. Mean spherical horizontal candle power to the maximum spherical candle power
|
Answer
Explanation
Related Ques
|
ANSWER: Mean spherical candle power to the mean horizontal candle power
Explanation:
No explanation is available for this question!
|
|
12) According to second law of illumination, the illumination at any point on an inclined surface is
a. Directly proportional to the cosine of the angle between the normal to the surface at that point
b. Directly proportional to the sin of the angle between the normal to the surface at that point
c. Directly proportional to the tan of the angle between the normal to the surface at that point
d. Directly proportional to the cot of the angle between the normal to the surface at that point
|
Answer
Explanation
Related Ques
|
ANSWER: Directly proportional to the cosine of the angle between the normal to the surface at that point
Explanation:
No explanation is available for this question!
|
|
13) According to the first law of illumination, the illumination of a surface due to a source of light is
a. Inversely proportional to the distance between the surface and the source of light
b. Inversely proportional to the square of the distance between the surface and the source of light
c. Directly proportional to the distance between the surface and the source of light
d. Directly proportional to the square of the distance between the surface and the source of light
|
Answer
Explanation
Related Ques
|
ANSWER: Inversely proportional to the square of the distance between the surface and the source of light
Explanation:
No explanation is available for this question!
|
|
14) The polar curves are used to find out the
a. MHCP
b. MSCP
c. Both (a) and (b)
d. None of these
|
15) The artificial source of light is
a. Arc lamp
b. Incandescent lamp
c. Discharge lamp
d. All of these
|
16) Nitrogen is added with the argon in an incandescent lamp to
a. Reduce the temperature
b. Reduce the possibility of arcing
c. Increase the brightness
d. Increase the efficiency
|
17) The inside wall of fluorescent tube is coated with
a. Sulphur powder`
b. Phosphor powder
c. Sodium
d. Krypton
|
18) In internal combustion engine drive, a gear box is
a. Required for controlling the torque
b. Required for controlling the speed
c. Required for controlling both speed and torque
d. Not required
|
Answer
Explanation
Related Ques
|
ANSWER: Required for controlling both speed and torque
Explanation:
No explanation is available for this question!
|
|
19) In diesel electric drive,
a. A diesel engine drives an ac generator
b. Haulage capacity is less
c. Regenerative braking cannot be used
d. All of these
|
20) For running at half of the maximum speed, the batteries of battery electric drive are connected in
a. Parallel
b. Series
c. Series - parallel
d. Drive cannot run at this speed
|
21) In tramways,
a. Two drum controllers are employed in series
b. Two drum controllers are employed in parallel
c. Only one drum controller is employed
d. Three drum controller are employed either in parallel or series
|
Answer
Explanation
Related Ques
|
ANSWER: Two drum controllers are employed in parallel
Explanation:
No explanation is available for this question!
|
|
22) In mail line train services, the
a. Acceleration and braking periods are long
b. Acceleration and braking periods are short
c. Free run and coasting periods are long
d. Both (b) and (c)
|
23) The ratio of the distance between any two stops and the sum of the time of run and the time of stop at one station is known as
a. Crest speed
b. Average speed
c. Maximum speed
d. Scheduled speed
|
24) The scheduled speed of a train can be increased by
a. Increasing the acceleration and retardation
b. Increasing the crest speed
c. Decreasing the duration of stop
d. All of these
|
25) Which among the following is mechanical braking?
a. Pneumatic braking
b. Plugging
c. Dynamic braking
d. Regenerative braking
|
26) During plugging, the speed of the motor gradually decreases. If the supply to the motor is not cut - off then the
a. Motor will continue to rotate in the same direction
b. Motor will continue to rotate in the reverse direction
c. Motor will come to rest
d. None of these
|
27) In case of dc series motor, the torque can be found from
a. Only magnetization curve
b. Only demagnetization curve
c. Both (a) and (b)
d. None of these
|
28) For regenerative braking, the motor which is not suitable is
a. DC shunt motor
b. DC compound motor
c. DC deries motor
d. AC shunt motor
|
29) The heat required by the weld is produced due to the contact resistance between the two pieces and is
a. Directly proportional to the current
b. Directly proportional to the square of the current
c. Inversely proportional to the square of the current
d. Inversely proportional to the current
|
Answer
Explanation
Related Ques
|
ANSWER: Directly proportional to the square of the current
Explanation:
No explanation is available for this question!
|
|
30) For welding aluminium alloys, the electrodes used are
a. Hard drawn copper
b. Cadmium copper
c. Chromium copper
d. Tungsten copper
|
31) Voltage required for butt welding is
a. 2 to 8 V
b. 8 to 15 V
c. 15 to 22 V
d. 22 to 30 V
|
32) In inert gas metal arc welding,
a. Argon is used for welding thin materials and helium is used for welding thick materials
b. Both argon and helium are used for welding thin materials
c. Both argon and helium are used for welding thick materials
d. Argon is used for welding thick materials and helium is used for welding thin materials
|
Answer
Explanation
Related Ques
|
ANSWER: Argon is used for welding thin materials and helium is used for welding thick materials
Explanation:
No explanation is available for this question!
|
|
33) Advantage of using electron beam welding is / are
a. Welds are clean
b. Absence of porosity
c. Distortion less
d. All of these
|
34) Non - consumable electrodes are made of
a. Carbon
b. Graphite
c. Either carbon or graphite
d. Same material as the metal pieces to be welded
|
35) An ac timer circuit is used to control the number of cycles for which the power may be supplied to the weld. In this, the time required for the voltage to fall by a given amount is
a. Directly proportional to the resistor
b. Directly proportional to the capacity of the condenser
c. Directly proportional to the inductor
d. Only (a) and (b)
|
